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Gavin, yea you can. I did it here:?

Matt, BTW are you the maker of the recordinghacks website? I use that website for every single mic look up! Its full over very useful info!

Thank you Matt! This means a lot to me. This makes a lot of since as well. As I journey down the road of mics, I am finding out a bunch of new stuff! I been doing a lot of research of parts and such to build myself my own mic. Having 2 different mics would be the best option.

Best Regards,
Jesse

Anyways I thought about it and wonder if anyone made a capsule that is dual but has a center
terminated "k47" on one side and the other have an edge terminated "k12" on the other side?

The rear side of every Braunmuhl-Weber style (dual diaphragm, large diameter) capsule, including the K47 and CK12 styles, is part of the sound of the front side. If you were to change the rear side of the CK-12 to anything else, the front wouldn’t sound like a CK-12 any more. The same applies to the K47.?

As a practical matter, the K47 has a single backplate, so there’s no "rear half" that could be removed and combined with something else. And of course the true CK-12 has a tunable inner backplate piece that sets the two chamber volumes. There is more to the sound of these than just the termination style.?

That’s not to say someone couldn’t engineer a mic with two distinctly voiced sides, of course.?

MXL had a mic that was promoted as a “dual voice” design. It had a front/rear switch and an LED that indicated which side was active. The capsule was a 32mm K67, IIRC, with 6-micron film on one side and 8-micron on the other. I assume they were tuned differently. In my testing, the side described as “warm” had an exaggerated 12kHz bump, +5.5dB, while the “bright” side peaked at +6dB around 10kHz.

Find notes on that here:?

With in-circuit EQ, it’s possible that mic would have been smoother and more usable, although I’m not sure the two sides would have sounded different enough (after EQ) to justify the cost of the switch, LED, and the special capsule.?

The alternative is to have two mics that were both purpose-built to sound like whatever distinct sounds you’d want. Hang them side by side, record both simultaneously, and then choose later which track to use. Yeah, that might cost more than one mic that does everything, but the benefit is that you only need one great performance, not two.

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matt.

Hi everyone,

I love the sonic differences in both capsules the k12 and k47. To me the k12 lows just seem fuller but the k47 has better highs. This is just from my experience of putting k12 capsule in a studio projects b3 and a k47 in another studio projects b3 mic.

Anyways I thought about it and wonder if anyone made a capsule that is dual but has a center terminated "k47" on one side and the other have an edge terminated "k12" on the other side? Sorry if I am getting terms incorrect.

The reason for this idea is that I love the sound of both. I would be able use the k47 on one side and then turn it around and use the k12 on another. I was thinking of having a switch that I can flip to change the capsule out or I can use a dual board with a 5 pin cable and a 2 way 3 pin spltter.

Any ideas on this? Could I take a dual capsule appart and then put a different piece in? Has anyone did this??

Thanks,
Jesse

I read over everything! YES This is what I was looking for. Thanks to all the hard work being put into this! Looks like I can buy a completed board set from here according to the website Mic Scharf??

I never really thought about making a 5 pin out and then blending the 2 channels together to make different polar patterns! I will be looking info getting a ck12 capsule though.

Best Regards,
Jesse

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I have a question regarding the EMI/RF suppression caps. On this page:??the value is .22nF (220pF) and here 22nF. That is a big difference, what is right?.

Thank you Mic Scharf!

I will work on reading through the info!

Best Regards,
Jesse

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Sadly, the 2555 data sheet you link to is mostly nonsense.? This capsule is a FETless electret, and the data sheet has details of the characteristics of the impedance converter shown in the schematic -- which doesn't exist within this capsule??
(The 2555 capsule only contains the part shown within the dotted line box on the schematic)
So, although you don't need a polarising voltage - as recordinghacks has already indicated - you will need an impedance converter.? That can be a Schoeps style FET interface, or perhaps an op amp impedance converter?
Mic Scharf has already linked to my Mid/side project . The FETless version of that project? shows how you might interface a capsule like the 2555, in it simplest form.
And it will be the capsule noise itself which dominates with that circuit.

I bought several?
TSB2555 capsules and looking at the datasheet it says the operating voltage is 1-10V?
( ). Seems like a?
big range...any recommendations of what voltage to get the lowest self noise and highest?
SPL? Lowest noise matters most to me. Also can the TSB2555 be used in a Schoeps style circuit?

That capsule is an electret. It needs no polarizing voltage.

Regarding “lowest self noise,” you might end up considering a larger capsule. Capsule self-noise is inversely proportional to active diaphragm area. Said another way, larger capsules have (or at least potentially have) lower noise than smaller capsules.

Another factor is capsule sensitivity. The higher the capsule’s output level, the lower noise the microphone could have — because you’ll need less preamp gain to get a usable signal level into the DAW. Preamps add noise (especially consumer-grade preamps, especially at high gain settings), but even at low gain they’re amplifying both the signal and the noise from the mic. The higher the signal level from the mic, the less preamp gain you’d need, which tends to result in a lower-noise track.

I’m not sure I understand the need for low noise AND high SPL. I think that microphones built for high SPL can afford to be noisier, and in fact typically are noisier, because the mic’s noise floor will be inaudible as compared to the very loud signal. In the case of condenser mics, the circuit can easily overload due to a high SPL transient — or, the downstream preamp could clip if the mic’s output voltage is too high. There are several common solutions to that, such as putting a capacitive pad on the mic’s input circuit, and/or attenuating the signal within the circuit to reduce the likelihood that the preamp clips. But most of those solutions effectively lower the signal-to-noise ratio of the mic. In other words: raising SPL capability also raises the mic’s effective noise floor. You’ve turned down the signal, but the mic’s native noise floor stayed the same (hence: lower signal-to-noise ratio), and you need more preamp gain to hear the attenuated signal, so the preamp amplifies the mic’s noise floor.

Audio design usually involves tradeoffs.?

The TSB2555 can be used in a Schoeps style circuit, although the full Schoeps circuit includes a DC multiplier that electret capsules do not need. The DC circuit in a Schoeps mic contains roughly 50% of the components of the circuit, so that’s not a trivial thing. You wouldn’t want to build a Schoeps circuit from a schematic if you’re using the TSB-2555, because you’d be doing twice as much work as needed.

Other people on this forum can point to PCBs for Schoeps-based *audio* circuits that more easily adapt to the TSB-2555. Or you could see buy MicParts S-25, which is a full mic kit with a Schoeps-derived audio circuit. (Full disclosure: I developed and sell that kit, so the previous sentence is an advertisement, not an impartial recommendation.)

But, as suggested above, if your goal is lowest possible noise, the TSB-2555 won’t get you there. By way of comparison, the MicParts S-87 (a large-diaphragm mic kit with a full Schoeps circuit and a very high-output capsule) delivers 6-8dB higher output than typical electret Schoeps mics, with lower noise.?

Also, if you want highest possible SPL, the Schoeps circuit wouldn’t be my first choice.

—
matt.

Hello!

Back in the mic making game and working on a Mid-Side setup! Anyways, I bought several TSB2555 capsules and looking at the datasheet it says the operating voltage is 1-10V (). Seems like a big range...any recommendations of what voltage to get the lowest self noise and highest SPL? Lowest noise matters most to me. Also can the TSB2555 be used in a Schoeps style circuit? I assume so but would like to verify.?

Thanks!

Best regards,
Blair

Hi everyone, I am new to this forum. I found it after reading a lot of info about building a microphone. What I would like to know is where to get parts and a donor mic shell in order to build a custom mic. Here are something things I am hoping for. Lowest cost as possible but even it it cost a lot more I am fine as long as its the quality I want. A fairly neutral sounding mic. Not over hyped or harsh highs. A solid bottom and lowest self noise as possible. I really hoping to buld a mic that is 7dba or lower on self noise but I know this may be rough doing it myself. 10dba would be ok. I want very lush lows and smooth highs that don't have sharp explosive Sss.?

Here is my background. I have modded a couple studio projects b3 mics. One I put a k12 capsule in and the other a k47. Then I ended up selling them for some dumb reason thinking I wasn't going to need them. Bad idea. I did not modifiy the circuit at all. With the k47 capsule the highs were not harsh and the mids/highs sounded very smooth. However I did not care for the lows as I felt like it did not have much body. The k12 capsule had wonderful lows. It was beautiful but the highs sounded great and not harsh, instead had very sharp Sss. It was a very narrow band Sss sound and even a de esser did not make it sound good. Over all the mic had 14dba of self noise.?

I can solder. Not the best but its not a problem.?

I am willing to buy a pre made circuit board. This would be the best, but if its less expensive I can buy parts and solder the pieces. I just need to know where to by the parts from.?

I did see the microphone parts website however, I feel that is a little out of my price range. I am sure they are very great builds. I am hoping to make something cheaper.?

Very low self noise is very important. I can find a bunch of mics that have much higher self noise, but I want ultra quiet.?

Thanks again for your time and thought.

Best Regards,
Jesse