Best Type of Microphone for Recording the Classical Guitar
One of the most usual questions I get asked is which microphone is the best for capturing the classical guitar, but as with all deep questions in life, I'm afraid there is no simple answer. Our guitars, nails as well as playing techniques differ vastly. Besides, our rooms have unique properties, and of course, our tastes vary. Another decisive factor is our listening environments, but that's a subject for another day.
I've written on Classical Guitar Tones extensively about the different microphones, brands and models. If you have been here for a while, you've seen me test all sorts of microphones, entry-level to high-end. In this article, I take a step back and present my thoughts on the different types of microphones, their strengths and weaknesses. Plus some words on the different polar patterns.
On being passive
Ribbon microphones have a relatively simple design with no active circuitry and use a thin metal ribbon suspended in a magnetic field. Most ribbon designs hear sound bi-directionally and produce natural and complex recordings. They have the reputation of being fragile and need careful handling and storage.
Dynamic microphones are similar to ribbons as both capture sound by magnetic induction. In contrast, they are very robust, resistant to moisture, and have low sensitivity. In practice, they offer no real asset in classical guitar recordings as their advantages benefit mainly on-stage use and capturing of loud sources.
For the most part, I don't get along well with ribbon or dynamic microphones, mainly because of their sensitivity or lack of. I often play soft passages or employ silence in my music, and with passive microphones, one has to crank the gain on the preamps to get sufficient levels, resulting in unwanted noise. After all, the classical guitar is a soft and delicate instrument, and no matter which preamps you use, it is impossible to get noiseless classical guitar recordings with passive microphones.
Ribbon microphones are also quite forgiving to the various mechanical "non-musical" noises, such as nail and fretting sounds. And this is why some people love them, especially on harsher and louder instruments and a less subtle repertoire. But, I find the response of most but the finest ribbon microphones, principally with the thinnest ribbons (some Royer, AEA, and Samar makes come to mind), quite sluggish.
Phantom power required
Nowadays, there are a plethora of active ribbon microphones, purposed for capturing softer sources and being less dependent on the preamp choice. These tend to work better with classical guitar. Yet, even high-end active ribbon microphones are far from being noiseless. I understand that for some people noise is a nonissue, but for me, it is a distracting element. I like deep blacks and hate when the softer parts or rests are being washed away by preamp hiss.
Also, the figure-eight polar pattern found in most ribbons makes them less than ideal for many recording situations. They do work nicely as a side microphone in an M/S stereo array.
Capacitors move the (recording) world
Condenser microphones require a power source to function and generally produce a high-quality audio signal mainly due to the small mass of the capsule. They can capture on tape utmost detail, sometimes even too much of it, and are the most used transducers in recording sessions and concert halls.
Most of the classic designs have been either tube or transformer equipped condensers, but with the dominance of digital recording, transformerless solid-state condensers have increasingly gained popularity in classical recordings for their additional clarity and lower self-noise.
Size matters
Condenser microphones are categorized by the size of their diaphragm and come in two main types: small-diaphragm, like most Schoeps' and the Neumann KM184, and large-diaphragm, like the Neumann U87 and AKG C414.
So, which one is better for the classical guitar, you may ask? Not so fast. Again, the answer is not straightforward.
Let's talk first about their differences.
Small diaphragm condensers are usually more accurate, with a faster transient response and superior off-axis response. They are also smaller and lighter, so they are easier to carry, besides being visually unobtrusive. The latter is a decisive factor in why SDCs dominate the concert world.
Paying audiences generally don't enjoy seeing a stage the musicians surrounded by several dozens of microphones and bulky heavy-duty stands to support them. Neumann, Schoeps and DPA provide small-diaphragm condenser systems with every possible polar response and mounting option a classical sound engineer might on location.
Polar patterns say more than you think
The downsides of using SDC's on a classical guitar, especially at home, are only a few but nontrivial. Small-diaphragm condensers are tuned for specific roles. Directional microphones are either purposed for close spots on soloists, used in combination with a stereo array at some distance, or for the main pickup and thus are tuned to compensate for the high-end frequency loss that occurs. The result, when used inappropriately, is either a poor low-end response or hyperrealistic recordings with exaggerated high-end. In other words, they can easily sound thin and harsh.
On the other hand, SDCs with an omnidirectional response (the real microphones), especially those that have been tuned for the free field, offer an optimal response at both ends of the spectrum. Additionally, they provide greater flexibility in positioning owing to the absence of proximity side-effects but become a challenge to use in non-treated rooms that universally suffer from early reflections and standing waves.
Microphones with wide- or sub-cardioid polar characteristics come to close the gap, with a better low-end response than their cardioid cousins, some room rejection, and sometimes less pronounced high-end. Unfortunately, small-diaphragm cardioids with such polar patterns are rare, and except for the bargain Line Audio CM3 / CM4, they are always on the expensive side.
So, where does the good old large-diaphragm condenser fit?
Generally speaking, LDC's suffer from a pronounced proximity effect, transient smoothing and suboptimal off-axis colouration. In addition, they require sturdier stands, are more difficult to position due to their size and weight, and can be quite visually intrusive in videos.
All these intricacies cannot be good, right? Moreover, excellent sounding large-diaphragm condensers suitable for the classical guitar are quite rare and expensive, as most LDC's are targeted for vocal pickup.
Any advantages?
As I wrote above, noise on a recording can be distracting. The smaller the size of the capsule, the greater the self-noise of condensers. Tube and transformer-based microphones are also subject to higher noise levels. Therefore, transformerless large-diaphragm condensers have lower noise to signal ratios, with several Gefell, Austrian Audio, and Neumann models reaching nonexistent self-noise figures.
Likewise, many universal studio LDC's grant additional flexibility, as they bring multiple polar patterns, removing the need to own or carry multiple microphones or capsules on a session. With a modern microphone, like the excellent and most versatile Austrian Audio OC818, you can not only choose on the fly between any possible polar pattern, but you can also do it long after the recording has been completed.
Here is my recording of Debussy’s Prelude VIII. Recorded on location with a pair of Austrian Audio OC818s.
Let's proceed to checkout.
One can make a good recording with any decent microphone, some experimentation and post-production skills to boot. There are no excuses for bad recordings in 2022.
On a budget, neither ribbon nor large-diaphragm condenser microphones of decent quality can be found as cheaper offerings are made either for a vintage vibe or vocalists in mind. Line Audio's small-diaphragm condensers are the undenied kings of the entry-level recording setup.
When searching for a high-end classical guitar recording setup to capture a world-class guitarist with a magnificent guitar in an excellent sounding room, a pair of exceptional and well-positioned omnidirectional or somewhat directional condenser microphones is hard to beat. DPA, Gefell, Austrian Audio and several high-end Neumann condensers come to mind. In such a scenario, the size of the diaphragm is incidental. With less ideal conditions, even high-end SDC's on a solo classical guitar, be it directional or not, can expose flaws and produce unattractive recordings.
To conclude, in most situations I favour large-diaphragm condenser microphones for their inherent sound qualities and noiseless behaviour. First-class LDCs can produce a luxurious recording and provide a pleasant listening experience. I also like how they look on videos; unapologetic, proud and predominant, almost commanding. With that said, the realism that some of the best SDCs treat the listener when every element is exemplary can be breathtaking.
Perhaps it is more advantageous to bring together small- and large-diaphragm condensers in an elaborate three- or four-microphone array.
A Three-Microphone Setup for Recording Classical Guitar
An M/S Stereo alternative.
Classical Guitar is a complex and rich sounding instrument; as such, it sounds better when is recorded with at least two microphones. A statement that you must have read several times already if you hang out at this site. Some engineers argue though that guitar is a relatively small instrument which tends to sound too "wide" when recorded with the most conventional stereo techniques; thus sounding unrealistic in playback.
Neumann TLM 193 and TLM 170 in M/S Stereo Configuration
Mid/Side stereo, which I discuss in my Three M/S Stereo Setups for the Classical Guitar article, is usually praised for its truthful representation of the classical guitar. The elimination of phasing problems and the flexibility it offers during mixing are additional important advantages, however, it is not immune to potential issues. Namely, the collapse of the room information in mono reproduction, and the inability to hear the resulted-combined sound without some processing to the channels (or the use of an M/S matrix). Lastly, symmetrical Figure-8 microphones, required for the "Side" channels, with a balanced response are generally expensive.
Alternatively, the combination of a "Mono" microphone placed at close-proximity and a "Stereo Pair" at some distance, shares some similar advantages without the drawbacks of M/S Stereo. Hence the Three-Microphone Setup is an appropriate option for capturing the subtleties of the classical guitar.
Purpose in position
Austrian Audio OC18 - A Large Diaphragm Cardioid Condenser
The "Mono" microphone is positioned close to the instrument (at about 50cm, although some could go as close as 30cm) to capture a full-bodied sound. I recommend a large-diaphragm condenser with a smooth treble response for this position; as not only it will capture the fullest sound, but the slower transient response of the large capsule will also give a less analytic, more relaxed response.
The "Stereo Pair" is placed a little further away to capture the sound of the room. A pair of small-diaphragm condensers is ideal here due to the better off-axis response and can be either Omni or Cardioid patterns depending on the acoustics. The actual distance depends mainly on the room; accordingly, as the distance increases, the height of the microphones should be increased as well. The distant pair brings to the mix crucial depth, space and some high-end articulation.
Decisions; Player vs Audience
Another way to see the three-microphone setup is as a fine compromise between the intimacy of what the player hears and the somewhat distant experience of an audience member.
During mixing, the three channels can be balanced to the desired sound; from close to distant and everything in between. Either the "mono" or the "stereo pair" can be used as the base sound. Think about a mono capture with some extra space or a distant pair with added fulness.
Examples
For the first recording, I used a Neumann TLM 193 relatively close to the guitar, and a wide pair of DPA 4011As as room microphones.
In isolation, neither the Mono signal nor the AB pair sounds particularly great. The first is somewhat plain and too direct, while body and weight are missing from the AB pair. When mixing all three microphones, the combined sound gets defined and three-dimensional; thus more real.
I made another example of the same setup and the exact same distances, this time with an Austrian Audio OC818 in Cardioid for the Mono duties. The AB pair is still the DPA 4011A. If you have read my Austrian Audio OC818 review, you already know that I love their sound, and I wanted to hear how well they can mix with the DPA microphones.
Combining M/S and Room Microphones
A few months ago, I also experimented with combining an M/S pair of Neumann TLM 193 and AEA N8 up close and a stereo pair of Austrian Audio OC818s at some distance, you can hear the result in this recording of Bach's Cello Prelude no.2.
Some things to take care of
If you want to try the Three-microphone setup, it is important to listen to the recording as a whole before committing to any microphone position. The Mono microphone may be judged alone if you plan to use for the main sound, but don't make bold decisions without listening to the combined audio.
Potential phasing nightmares is one of the biggest drawbacks of this setup, so take extra care to eliminate any issue and check with a proper phase meter plugin regularly (read my article on the Three Most Essential Plugins for Classical Guitar).
Lastly, although the recording should be evaluated as a whole, the close and distant setups might need to be EQed separately. Nevertheless, you may apply a catholic EQ with basic filters and sculpturing.
Cheaper Alternatives
Line Audio CM3 - A budget SDC with an surprisingly good sound
Apart from the aforementioned combinations, any microphone could do a decent job. If you just starting and your budget is limited, buy the best large-diaphragm condenser you can afford and a pair of cheaper small-diaphragm condensers, like the Line Audio CM3/CM4 (read my comparison of the Line Audio CM3 and DPA 4011A).
Final thoughts
I've seen mostly AB, XY, ORTF and sometimes M/S setups explored by engineers and home recordists for the classical guitar. All of which can produce excellent recordings given the right circumstances. Yet, I find that with more elaborate techniques I can capture the instrument, at home or on location, with exceptional precision, without any disadvantages. Except maybe for needing more input channels, cables, stands, and more time for the setup.
A Three-Microphone setup can shine in a very wet hall, as it allows us to capture the body and definition of the instrument while including as much ambience as desired. In a home recording of the classical guitar, it offers great flexibility, if not to provide ambience, it combines the intimacy and fullness of a close pick-up with some extra depth provided by the spaced pair.
So, what do you think? Have you tried a three-microphone setup? Which microphones have you used?
Austrian Audio OC18 Cardioid and OC818 Multipattern Condenser Microphones Review
Elegant and revolutionary; A modern classic.
Some of my all-time favourite recordings have been made with the AKG C12 (or it stereo counterpart C24), I always adored its distinctly refined sound and musical articulation. Unfortunately, these are quite rare and extremely expensive microphones, so acquiring one is out of the question.
Austrian Audio, formed by ex-AKG employees, promises to carry the much-desired sound of the classic AKG microphones to the 21st century, with outstanding engineering, forward-thinking features and a competitive price. Based around the new handmade ceramic capsule CKR12, and 100% manufactured in Vienna, the large-diaphragm multipattern condenser OC818 and its sibling, the fixed-cardioid OC18, create high expectations.
Brass-ring capsule issues
The new CKR12 ceramic capsule.
The brass-ring CK12 capsule, originally designed for the C12 and early C414 microphones, offers an excellent frequency response with even characteristics on- and off-axis but was so labour intensive and inconsistent that AKG dropped its production and moved on to a simpler design more than 40 years ago. Numerous successors have been presented, and as with all sought-after microphones, a lot of clones have tried to recreate the magic of the famous capsule. But, in the hearts of the audio engineers, the original C12s and C414s, when in good condition, are still the best sounding.
Austrian Audio measured some of the best sounding CK12 capsules available to model the CKR12 which is at the heart of every OC18 and OC818 microphone. The new capsule is ceramic and is made by hand, this design should have a similar response but with greater consistency and durability.
Classy looks
The microphones themselves look rather classy and somewhat understated with a body made of a single piece of zinc-aluminium alloy, finish and craftsmanship are impeccable. The OC818 is silver, while the OC18 is black and lacks the polar pattern selector switch and the second output on the back, but is otherwise identical. The silver finish of the OC818 looks slightly more elegant, but with one drawback; the lettering on the switches is a little to see under certain lighting conditions.
Polar pattern selector, filters and pads on the OC818.
There are 40Hz and 80Hz high-pass filters at 12dB/octave available to control low-end rumble as well as a gentler 6dB/octave at 160Hz to compensate for proximity effect. Carefully chosen high pass filters on microphones and preamps are appreciated here as it is preferable to cut unwanted frequencies before they hit the digital realm. When recording classical guitar, I pretty much have the 40Hz filter engaged at all times.
The sensitivity of 13mV/Pa is respectable, making the choice of preamp less critical. Both the OC18 and OC818 worked flawlessly with the preamps of an RME Babyface Pro FS and my AEA TRP2 external preamps. Both microphones also incorporate -10dB and -20dB pads to protect the internal electronics from very loud sources, which is never a problem with classical guitar, so I haven't tried them. On the other hand, the self-noise of 9dB-A is superb for capturing the subtle plucking sound of nylon strings, especially for very dynamic playing styles.
Dual-output capabilities
A Mini-XLR gives a separate output from the rear capsule of the OC818.
A distinctive feature of the OC818 is the ability to record the two capsules separately and blend them later during mixing with the PolarDesigner plugin to craft the perfect polar pattern. Read my post regarding the PolarDesigner plugin here. Or use the OCR8 Bluetooth dongle and choose between 255 discrete polar patterns in realtime. Unfortunately, I wasn't provided with the OCR8 to test that feature, but the PolarDesigner plugin has been excellent.
Finally, a new plugin developed by Austrian Audio called AmbiCreator makes possible the recording of ambisonic B-format signal with two OC818 microphones. I haven't tried that yet, but I like that the team of Austrian Audio is restless.
Accessories
A pair of OC818s and a single OC18 in the aluminium case.
Austrian Audio was kind enough to send me a pair of OC818s and one OC18 for testing, the microphones arrived in a compact aluminium case which is excellent for storing and transferring them. Wooden cases can sometimes be more luxurious, but an aluminium case is lighter and much more practical. I was also provided with shock-mounts and simple plastic clip mounts. The shock-mounts are compact enough and seem to work well. Saying that, I would like to see them design a more elegant mount as an alternative to match the sophistication of the microphones.
So, how do they sound?
OC818s in AB Stereo.
I first tried the microphones with the Cardioid pattern and my usual wide AB setup. The OC818s captured the articulate character of my spruce/brazilian rosewood classical guitar in abundance. Paired with my AEA TRP2 preamps and RME ADI-2 Pro FS converters, the OC818 pair delivers a gorgeous rich sound with excellent clarity. The tone is bright and defined but in a smooth way, not peaky or harsh neither hyper-realistic.
Austrian Audio OC818 in Cardioid & OC18 - Frequency Response and Polar Pattern
When tested against the Neumann TLM 193, an honest and natural microphone, it becomes apparent that the Neumann is somewhat subdued on the high-mids. And while both microphones can produce a beautiful recording, I prefer the more detailed sound of the OC18 and OC818. I've been using the Neumann TLM 193 for years so their somewhat laid back nature is not new to me, and therefore I usually chose to pair it with a brighter mic, like the TLM 102/103 for instance, to bring back some articulation.
I also tried the OC18 against the Neumann TLM 102, a microphone that I always liked for its natural response, I found that in comparison the Austrian Audio offers a richer midrange with more fluent top-end and defined low-end, thus making the Neumann sound a little hollow in the mids. Arguably, the OC18 is the better microphone, and not much more expensive.
Another microphone I had available for testing is the Gefell UMT70s, a multipattern large-diaphragm condenser built around the famous Georg Neumann M7 capsule and with the finest engineering. It appears to me though that the Cardioid and Figure-8 patterns of the UMT70s were voiced for close miking, and found them to be less desirable for solo classical guitar which benefits from more distant miking. I would imagine that up-close, the Gefell would produce juicy recordings for popular musical styles.
Austrian Audio OC818 in Omni - Frequency Response and Polar Pattern
Both the Gefell and Austrian Audio microphones sounded outstanding in Omni, albeit with a different character. The OC818 produce a more natural, true-to-life recording of the guitar in the room with even response across all frequencies and a fuller low-end, the frequency response graph shows a slightly more pronounced high-end with more gentle high-mids. The Gefell UMT70s in Omni imposes a smooth and creamy sound; juicy and delicious, but not nearly as accurate. Honestly, if I only needed an Omni microphone, I would be happy with either. The OC818 costs less though and sounds consistently excellent in all patterns.
A universal studio microphone
Austrian Audio OC818 in Hypercardioid - Frequency Response and Polar Pattern
I then switched to the Hypercardioid pattern and a slightly more distant set-up. The tighter pattern leaves most of the room out of the recording and the extra distance lets the guitar breath more freely. There is a little less body to the guitar sound but mids and highs are captured in detail and elegance; for challenging rooms, one or two OC818s in Hypercardioid would be the best choice.
For placing the classical guitar inside a denser mix, the tight pattern, and the absence of room ambience of the Hypercardioid pattern offer a vital asset. My instinct when laying down the guitar part for an Elusive Aura recording last July was to use the Omni pattern of the OC818. I couldn’t get the mix right though; the room sound pushed the classical guitar in the background, and in the low strings were fighting with the two cellos. I decided to re-record my part with the Hypercardioid pattern and voila! The classical guitar part almost mixed itself.
Finally, I tried a pair of OC818s in an M/S setup with a Cardioid Mid microphone, read my Three M/S Setups for Classical Guitar post. The truly symmetrical Figure-eight pattern and the full low-end extension should make the Austrian Audio microphones excellent in that application. After processing the Side microphone and balancing the levels, the result is a very realistic image of the guitar with a solid centre image and a polished sheen. My room, even though it's not large, it has a pleasant sound for acoustic instruments due to non-parallel walls, high ceiling, wooden floor and moderate treatment. I can imagine that the OC818s in M/S would sound impressive in a large hall or church.
Austrian Audio OC818 in Figure-eight - Frequency Response and Polar Pattern
Ambience duties
In this Bach's Cello Prelude recording, I used a distant pair of OC818s in Cardioid to pick up the room together with the Neumann TLM 193 and AEA N8 in M/S Stereo placed in the direct field. I think that the Austrian Audio captured the ambience admirably and provided the recording with detail and clarity. In that scenario, the laid back character of the Neumann and AEA combo complements perfectly the brilliance of the Austrian Audio pair.
OC18 vs OC818
I believe it is a smart move for Austrian Audio to release the fixed-cardioid OC18, as many don't need the extra patterns and can save a few hundred euros. According to Austrian Audio, the tolerances of the CKR12 capsules are so tight that any OC18 and OC818 will perfectly match and can be even used as a stereo pair. But, given how much more versatile the OC818 is, costing only (at least for the time) a few hundred more, it is difficult to recommend the fixed-cardioid version.
Conclusions
Austrian Audio OC818.
Austrian Audio are the rightful heirs to the CK12 design tradition, it doesn't surprise me in the least that they developed a new microphone that sounds so alluring. Contrary to a lot of large-diaphragm condensers that either produce a fake sense of clarity with over-pronounced high-end or a smeared response, the Austrian Audio microphones capture ample detail; yet they manage to remain smooth, never harsh or sharp.
With low self-noise, exciting yet clear sound and dual output, the OC818 has become my favourite large-diaphragm condenser for recording the classical guitar. I used the pair of OC818s in Omni for the recordings of my latest classical guitar suites "A Quiet Place" pt. I and II, and with a custom polar pattern on “Baltik Winter”.
Coda A - Apples vs Oranges
I compared the OC818 with DPA's 4006A and 4011A small-diaphragm condensers. The DPA could be my favourite sounding microphones for classical guitar; their truthfulness is unsurpassable but they suffer from a relatively high self-noise, especially the 4011A. The omni 4006A has an impressive 40 mV/Pa sensitivity and is less noisy.
This may seem like comparing apples and oranges due to the different design, but the DPA microphones are the epitome of clarity, definition and precision and I wanted to see how the Austrian Audio microphones compare. Both DPA capsules offer an almost brutally honest pick-up, with breathtaking realism; like “being there in the room”. To my surprise, the OC818 set in Omni and Cardioid respectively comes quite close; maybe not as realistic and precise, but a touch more musical and seductive in exchange.
The OC818 is a large-diaphragm condenser and might not be best suited as the main pair for orchestral recordings. On the other hand, for small ensembles and solo instruments, the noiseless operation and extra musicality can be favourable.
Coda B - Perfect for the Cello
My friend and great cellist Natasha Jaffe came over to my studio one day and we tried one OC818 in front of her Cello. We immediately loved the expressive and balanced sound the microphone captured, the Neumann TLM 193 seemed a little dull in comparison. We tried a couple of different positions to make sure that no microphone had an advantage, the results were consistent across all tests. Natasha decided to buy an OC818 for her own productions, as she felt that the sound of the Austrian Audio was "finished" and “ready”.
Coda C - Recording Debussy
Here another is a real-world example of the use of AB Stereo on Classical Guitar in a professional setting. I used a pair of Austrian Audio OC818 microphones set in a Custom Polar Pattern that combines the best of Cardioid and Omni qualities. The spacing of the microphones is 26cm. The goal was to capture the pure tone of my Angela Walter guitar together with the incredible sounding main hall of the Musikbrauerei in Berlin.
DPA 4011A vs Schoeps CMC6 MK22
Other than various Neumann microphones, the most used small-diaphragm condensers in classical concert halls and recordings are made by DPA and Schoeps. The philosophies behind their designs are quite distinctive, as are the usual descriptions of the family sound of each brand. Arguably though, they are more similar than different, as they both belong in the relatively uncoloured realm. But the big question remains; which microphone is better for recording the classical guitar.
To try and answer that question, for my needs and tastes, I had to get demo units of their cardioid microphones.
A Cardioid and an Open-Cardioid
The 4011A is a staple performer for many acoustic/classical instruments when a directional pick-up is required, Schoeps also offers a few different cardioid capsules with their Colette system suitable for a variety of uses. The MK22, which I chose for this shootout, is an open-cardioid. Schoeps describes its characteristics as a combination of the natural low-end of an Omni pattern with the benefit of cardioid directionality. In essence, it is a little wider than their standard cardioid capsule, MK4, and offers a marginally finer bass response.
Comparing the Polar Pattern plots of these microphones, I realised that the MK22 is closer to the characteristics of the 4011A than the MK4, making the decision easier, and this comparison quite logical.
DPA 4011A Frequency Response
DPA 4011A Polar Pattern
Schoeps CMC6 MK22 Frequency Response
Schoeps CMC6 MK22 Polar Pattern
It has nothing to do with sound
The DPA 3511A Stereo Kit
This might be a little unfair to Schoeps, but it's not my fault. DPA arranged for me to have for reviewing the 3511A Stereo Kit; a high-quality aluminium case which except for a matched pair of microphones, includes a lot of premium accessories, like their high-quality microphone mounting clips, shock mounts and a long stereo boom. All made with the highest standards and can be convenient in the field.
Schoeps CMC6 MK22 Set
From Schoeps, all I got was a pair of CMC6 bodies with the MK22 capsules. I know that ultimately the sound is what matters most, and I that can be evaluated without any extra accessories. But getting familiar with the DPA system, elevated my experience.
Another observation that doesn’t have to do with sound is that the NEXTEL finish of the CMC6 preamps and capsules is quite fragile, I thought I could scratch them, just by looking at them. In comparison, the 4011A have a more solid feel and seem more durable.
Setting up
As per my usual recording techniques for the microphone duels, I placed each pair at an AB configuration, with 36cm distance between them, 96cm from the ground and around 70cm from the top of my spruce guitar.
By listening to the samples, it is evident that both microphone pairs provide a solid performance. I would be totally satisfied with either, but there are some differences.
Unambiguous precision
The 4011As have a unique way to draw an utterly accurate and almost holographic image of the classical guitar, without any sign of harshness or hardness that is not a product of the performance. The sustaining notes, ring longer and the complex harmonies are captured clearer, like if they are taken apart.
Without sacrificing detail, the MK22 capsules portray an euphonic result. They are fast and analytic, but yet with a smooth and musical character; as if the performance is treated with a touch of kindness.
Au contraire, the DPA microphones will represent with unambiguous precision all the nuances and subtleties of a world-class instrumentalist and a high-grade luthier guitar; exposing likewise any flaws on a player's technique or the instrument. Their honesty can be brutal and overwhelming in some cases. If the source is good, they are going to reveal it; if not, forget about using them.
The Schoeps's offer a gentle depiction of the performance by applying a veil of wizardry and charming sweetness. However with the DPAs, it is like looking at the recording through a magnifying glass.
Noise concerns
My only gripe with the 4011A is the high self-noise. At 18dB-A the noise is not excessive and in most cases not even noticeable, but it can be bothersome for distant miking with softer instruments, or very dynamic musical styles.
The MK22 with 13dB-A of self-noise is almost as silent as my Neumann TLM 193 which have a remarkable 10dB-A of self-noise performance. In reality, most rooms are noisier than any of these mics.
Back to the original question
Honestly, I cannot say which microphone is better; probably neither is. The Schoeps have a sound, as the DPAs and ideally, I would love to own sets of both. In isolation, both pairs should sound stunning, if not, the problem is certainly not on the chosen pair of microphones.
When I'm not directly comparing and analysing them so closely, I believe that their differences are not as pronounced. Saying that, after hearing to my playing and guitar(s) with the 4011As (and 4006As which DPA also sent me), it is difficult to accept anything less realistic.
Three M/S Setups for Classical Guitar
Capturing the natural room sound of the guitar.
The Mid/Side microphone technique has almost a century of history. Developed by Alan Blumlein in the early 1930s, it became popular in the broadcast studios because of its compatibility with mono. Even in the recording studio, it appears to have many advantages over the most commonly used stereo techniques.
With small instruments like the guitar, it is easy to capture a too wide of an image, resulting in an unrealistic and often a blurry reproduction, especially with ORTF and AB techniques.
Neumann TLM 193 & TLM 170 in M/S Stereo
The "Mid" microphone of M/S provides a solid capture of the instrument, while the "Side" microphone is responsible for picking up the ambience of the room. The right balance of the two microphones allows for a truthful image of the guitar realistically placed in the sound field.
The M/S technique gives you the most control over the stereo spread, but the best part is that you don't have to commit to any balance until the mixdown, as you can always change the balance long time after the recording is finished.
Things to consider
As the "Mid" microphone is responsible for capturing the actual sound of the guitar, it is essential to take the time and make sure that it's placement is optimal. Otherwise, there is not a lot you can do to fix it. Also, if the room ambience is not pleasant there is not a lot you could do to improve it, so you are better off with a close AB technique and using artificial reverb in your DAW during mixing.
Here is one of several M/S setups that I've tried this week. I placed the "Mid" microphone at a distance of 55cm from the top of the guitar, aiming at the midpoint from the bridge and hole. With the capsule being at 96cm high, slightly angled downwards, placing it on-axis with the angle the I hold my classical guitar.
The "Side" microphone with a Figure-8 pattern was simply placed on top of the other at 90 degrees, aligning the capsules as close together as possible, minimizing phase issues. The whole setup was angled slightly to the sidewalls of my room. The room is medium-sized, with a wooden floor, high ceiling and a few interesting angles on the wall, making it relatively live-sounding.
Austrian Audio OC818 M/S Pair
Austrian Audio OC818 in M/S Setup
In this first example, I used an Austrian Audio OC818 pair with the "Mid" microphone was set to cardioid. The response of the Austrian Audio microphones is fairly natural, especially at the low and mid registers. A slight boost is present at the higher frequencies, but it retains the very smooth character of the classic ceramic capsule, making the classical guitar recording to sound polished and vivacious, without any sign of harshness.
Gefell UMT70s M/S Pair
Gefell UMT70s in M/S Setup
The second example utilises a Gefell UMT70s pair, these mics have a unique appearance, an incredibly small grill and an unquestionably satisfying feeling to the touch, the craftsmanship is second to none. The UMT70s shows a distinct bright character with slightly recessed lows in its cardioid pattern. The Gefell microphones offer coloured pickup but maintain a smooth quality. In a way, this combination produces a somewhat more finished recording, with nostalgic charm, it reminded me of some Julian Bream albums. The result is pleasing but differs from the sound that I hear when I play my guitar, in my room.
Neumann TLM 193 and AEA N8 in M/S
Neumann TLM193 and AEA N8 in M/S Setup
An often overlooked aspect of the M/S microphone technique is that it doesn't require a matched pair of microphones. So for the last test, I decided to combine the Neumann TLM 193 with a ribbon microphone for "Side" duties, in this case, an AEA N8.
The TLM 193 has a natural pickup, with good low-end extension, flat mids and unhyped high-end. The most gratifying aspect of the Neumann is that it captures all the nuances of the classical guitar without emphasising any frequency. Additionally, it is dead silent which enhances dynamic playing styles as it allows the notes to fade to complete silence.
The AEA N8 offers an extended high-end in comparison to more traditional ribbons and a very juicy low end. This combination in an M/S setup produces a bigger soundstage and a sound that is reminiscing of the what I hear when I play.
Conclusions
All three setups can produce high-quality recordings, although the perspectives of their designs are different. I'm used to the Neumann sound, and I gravitate towards that, together with the N8 I think they produce the purest and calmest recording, but with the expense of some definition and the higher noise floor of the ribbon. The Austrian Audio microphones are the most versatile and they take EQ well. They are detailed, without sounding overly analytical, and offer an elegant and smooth sounding result. The Gefell combo sounds like an excellent record from perhaps a different era, but if you love that sound, it is impossible to get it with the other microphones.
Coda
The M/S Stereo technique has the potential to create outstanding recordings, captures a full-bodied and defined sound while eliminating phasing issues. Larger halls and resonant spaces are where it excels as it allows us to concentrate on the recording and fine-tune the balance of ambience and close sound during mixing.
Austrian Audio OC818 and the PolarDesigner plugin
What if you could set-up the microphones, record your classical guitar and configure the best polar pattern your room after the recording is finished?
Austrian Audio PolarDesigner Plugin
Polar pattern selection on large-diaphragm condensers is not a new thing, a few microphones intergrade continuously variable selectors that allow in-between pattern selection, or allow the two capsules to be recorded in separate tracks. Austrian Audio expands the possibilities with the PolarDesigner plugin.
The most important feature of the plugin is that it enables us to craft the perfect polar pattern responses across up to five crossover bands, at any time after the recording is finished. To make the plugin even more useful, Austrian Audio has packed a lot more into the PolarDesigner to perfectly fine-tune your sound.
Usual suspects
Austrian Audio OC818 M/S Pair
I decided to try it first on an M/S setup, I used the two output method only on the Mid microphone, I positioned it at 96cm high and around 60cm from the top of my classical guitar with a slight downward angle so that it is on-axis with the spruce top. I placed the second OC818 on top of the first in Figure-8 pattern.
Basic sounds
With the Side mic muted, I concentrated on the Mid mic for a while.
The unprocessed track, with each capsule recorded at a different track, is unusable without the PolarDesigner plugin, but that was expected.
First, I wanted to see how the basic patterns would behave. So, I enable the plugin, as well as some lean low-cut and high-cut filters.
Tweaking the patterns
After playing around with the controls for some time, I found that the Omni pattern assigned to the lower frequencies gives a beautiful body sound to my guitar. Cardioid and Wide-Cardioid patterns were chosen for the mids, to bring tones of the guitar in focus. And for the highs, I used more of a Wide-Cardioid pattern to add some room ambience.
I also used the free-field equalization preset, which I'm not exactly sure what the underneath processing is, but gave more depth and definition to the overall sound. I boosted the lows a little with the proximity control bar.
And finally, I added the Mid channels to the mix and balanced all three to get a natural room sound.
Conclusions
As you can see, the possibilities are endless, and you only have to position the microphones once, record a couple of takes and then figure out the perfect polar response during mixing.
Additionally, on remote location recording, lugging up monitors to accurately check that the microphones are placed in the most desirable position can be quite unattractive. Headphones, on the other hand, are never the best option to judge stereo spread and overall tonal balance. The PolarDesigner plugin allows for fine-tuning to take place with the speakers and room you know and trust at your mixing room.
Click here for the full review of both the Austrian Audio OC818.
PolarPilot App
Austrian Audio PolarPilot App
Austrian Audio designed an App that allows for real-time wireless control over the analogue bias voltages of the OC818, allocating 255 discrete polar patterns for us to choose. Plus access to high-pass, and pad in realtime via Bluetooth. Unfortunately, they didn't send me the OCR8 Bluetooth dongle that is required for this to work, so I couldn't test it out.
The judgement day
PolarDesigner Terminator Control
The plugin allows uses some sort of AI that determines what is important and not and provides a spill terminator or maximize target algorithm which should in principle reduce unwanted spill from other instruments But, I didn't get to use.
DPA 4011A vs Line Audio CM3
Line Audio is a relatively unknown Sweedish company, or rather a one-man shop, dedicated to manufacturing high-quality, unhyped microphones and linear pre-amplifiers. They have been in this business for more than 30 years, and by cutting the middle man, no advertising and minimizing cost on all the not essential elements, they offer their products at the most affordable prices.
DPA’s premium case.
DPA, on the other hand, is one of the leading names in the classical recording world. Many recording engineers, producers and musicians sing praises for their clarity and honest presentation. The microphones, as well as the accessories that accompany them, are as premium as it gets. But, performance comes at a cost.
In this duel, I wanted to see if the CM3 cardioid condenser stands any chance against the 4011A at a less than a tenth of its price. In other words, could someone with a limited budget still manage to get a decent recording?
Setting Up
I positioned the microphones at a small AB setup with 36cm between each microphone, at 96cm high and 55cm distance from the top of the guitar. At this distance, the microphones can capture the true sound of the guitar, and with their cardioid pattern, reject most of the room acoustics.
DPA 4011A Frequency Response and Polar Pattern
Line Audio CM3 Frequency Response and Polar Pattern
The details matter
Listening to the recordings, the DPA microphones have breathtaking clarity and detail at every frequency. They demonstrate a better resolution and capture a holographic image of the classical guitar, with more realism and depth. The 4011A are brutally honest microphones, but if you are recording a luthier grade guitar and a great guitar player in a beautiful sounding room, you want it all on tape.
The CM3s surprisingly (or not, if like me you have used them for a while) sound very close to the DPA. They are a little more plain sounding, with less resolution and depth, in comparison it feels feel like something is missing from the image. They are also less sensitive and can benefit a lot from a good preamp, but peculiarly they were only slightly noisier than the 4011A in these recordings.
Line Audio’s basic but very portable case.
A distinct approach
The Line Audio CM3s come at a very minimal package, shipped in a simple plastic box, with a basic plastic microphone holder and a decent windscreen. They are so inexpensive, so there is nothing to complain there really. They are also light and small enough, almost as small as an XLR adaptor, that I'm not hesitant to carry a pair even my jacket's pockets.
DPA sent me for test their premium stereo set, that comes with a luxury case and all the accessories you might ever need. The craftsmanship is impressive, everything feels finely processed with all the pieces machined out of solid aluminium. The full assembly looks stunning. Their stereo bar, while relatively expensive, is the best I've ever used.
DPA 4011A Stereo Set, all the accessories you’ll ever need.
Single 4011A or a more basic stereo set up is available, they come with only the essential accessories in a hardshell nylon case. This case is also of premium quality and judging by my experience with the d:vote 4099g (you can read my review here), I prefer this kind of case to wooden cases that come with most higher-priced microphones. As you cannot carry them easily for location recording because of weight and size. This is true especially for small-diaphragm condensers, which might see more commute than larger studio microphones.
For different use cases
In conclusion, the 4011A is the better microphone of the two in every aspect. Taking us a step closer to capturing the classical guitar in all it's nuance. Also, if you charge for your recording services, showing up with the DPA set will reassure your clients for the extent of quality you are committed to.
If you are on a limited budget, or just want to record yourself for non-commercial uses, the Line Audio microphones are the best-kept secret of the recording world. The CM3s can capture classical guitar with realism and honesty and are so inexpensive, you can buy a few.
In conclusion, the 4011A is the better microphone of the two in every aspect. The engineering and the accessories are unparalleled in quality, not to mention the sheer detail and sound quality that they capture. Taking us a step closer to capturing the classical guitar in all it's nuance. Also, if you charge for your recording services, showing up with the DPA set will reassure your clients for the extent of quality you are committed to.
But, if you are on a limited budget, or just want to record yourself for non-commercial uses, don't shy away from the Line Audio microphones, as in my experience it is hard to find any other small-diaphragm condenser microphone with such natural characteristics at this price range or even many times more expensive. The CM3s can capture classical guitar with realism and honesty and are so inexpensive, you can buy a few.