Non-expert here, but in case it's useful:

I have read somewhere that the 5024 capsule is great for that application, however I believe I read that it may distort if used for loud environments such as airports (jet take offs) or loud factory settings.
I'd like to build a second SASS but for louder situations.
Is there a mic capsule better suited for loud subject matter that one of you folks might suggest, or is the 5024 also usable in louder situations?

I made a "Simplest P48" mic to put inside my cajon, and that application may see louder SPL than what you're describing (depends on how close you are to that proverbial jet.)

Depending on what you are anticipating, you might get by with the 5024 with a lower-sensitivity circuit?

If you really need the capsule to handle some high SPL, there are some options, but I didn't find one with the same SNR as the 5024 that also could handle high SPL. (In my application it didn't matter, because the cajon "kick drum" was blasting loud and the SNR wasn't an issue because I didn't need to capture quieter things. Maybe similar dynamics will factor in your decision.)

You might look at JLI-60Axxx capsules. Said Brad Confer from JLI: "The JLI-60Axxx mics are all varieties the same capsule.? The letter after the A (T, Y, etc.) denotes sensitivity of the element.? T would equate to a -44 +/- 3dB.? Check the sensitivity section next to the line drawing for the other suffix values.? The -102 denotes a tighter tolerance of +/-2dB. The exception to this is the JLI-60A-T.? It is a different mic than the above series, but equivalent."

I ended up with a JLI-64PCX "linkwitzed modified" and used with the RCA version of the Simplest P48 circuit (with a 47k resistor). (When I tried a 5024 with that RCA/SP48 circuit, it indeed clipped the mic capsule, but "kick drum" like noises can be super loud.)

Other low-sensitivity omnidirectional capsules I can find; no idea which of these are good/bad/whatever:

MCE-4001???????????????? (should be identical to JLI-60AY) max SPL 115 dB
JLI-60AT???????????????? 6mm sens -44dB, 58dB SNR, very flat >20Hz
JLI-60AY???????????????? 6mm sens -42dB, 58dB SNR, very flat >20Hz
Soberton EM-4530???????? 4.5mm sens -42dB "110 max SPL" 58dB SNR, flat >30Hz
Soberton EM-6050???????? 6mm sens -43dB "110 max SPL", 58dB SNR, flat >30Hz
CUI CMEJ-0627-42-SP????? 5.5mm sens -42dB "115 acoustic overload", 60dB SNR, flat >100Hz? (330Ohm internal resistor)
CUI CMC-6035-130T??????? 6mm sens -42dB "130 acoustic overload", 70dB SNR, flat >100Hz

Brad at JLI also said "the highest SPL rated 6mm I have is 110-120, depending on the version." Not sure which capsule he meant there, my notes are incomplete.

He also said "if you can use a larger mic, I have a 25mm cap that will do 130dB..." (presumably the JLI-2590A which is a 3-wire.)

Some links for the above:







René from this list said: ""I think the CUI CMC-6035-130T might be good. 70dB snr is good, but it is a weighted measurement, about 58dB is the old norm. Some JLI datasheets also quote the snr as weighted, others not. Datasheets for mic capsules are very hit or miss..."

Hope that's helpful,

-Casey

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That capsule had a max SPL of 110dB. If you go straight to a condenser without built in FET you can pad it with a capacitor. I’ve used the 2555B with a 220pF capacitor as a drum mic. It handles a very high SPL.

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I think they're looking for a Switchcraft A5M, which is a whole plug - but the insert is what you find. Or copies of that design.

-Scott

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry

On March 11, 2025 at 6:50:11 PM, matthewsewell via groups.io (matthew@...) wrote:

If you do this with a dual diaphragm with a single backplate, does that mean you can only do figure 8 and (if you cut the charge to one diaphragm) cardioid?

If the microphone works in Cardioid, it will work in Omni too (assuming you have two metallized diaphragms); just short the two diaphragms together.?

If the front diaphragm is at +60 and the backplate is at 0V, disconnecting the rear diaphragm gives a 4-5dB level boost for the front diaphragm. I’ve heard that called “true cardioid” although I do not know the origin of the term.

To make Figure 8, polarize the rear diaphragm at -60VDC (equal amplitude but opposite polarity to the front diaphragm rail). Pull signal from the backplate. No coupling capacitor is needed, unless the capsule leaks DC.

You could make intermediate patterns too, via a pot on the rear diaphragm’s voltage rail. +60V would be omni. +20V would be wide cardioid. 0V is Cardioid. -20V is hypercardioid. -60V is Fig8.?

—

matt.

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Great question. The bias voltage is applied to the backplate. Then the diaphragm is connected to the virtual ground via the 1G resistor. That resistor “develops” the signal via the voltage change caused by the change in capacitance due to sound moving the diaphragm. ?That voltage also goes into the Opamp.?