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Lom usi circuit vs simple P48

 

Hi all,

I have a pair of Lom basic Ucho mics, but sadly they clip if I use them on my piano.
So I wanna try myself with capsules that have higher SPL and wanna get the best sound possible out of it of course.

Today I looked inside the Lom basi Ucho mic, and there were quite a few components soldered to the pcb. Has that secret of the LOM circuit already leaked into the public domain?

Cause I find Lom sound better than Micbooser in my humble opinion.

Good weekend!
 

I asked?Jonas about these PCBs a while back, they are proprietary information. He will supply them to you, so may be worth asking if he can do some custom circuits on the same board for you.


On Fri, 14 Feb 2025 at 18:14, martenberger92 via <martenberger92=[email protected]> wrote:
Hi all,

I have a pair of Lom basic Ucho mics, but sadly they clip if I use them on my piano.
So I wanna try myself with capsules that have higher SPL and wanna get the best sound possible out of it of course.

Today I looked inside the Lom basi Ucho mic, and there were quite a few components soldered to the pcb. Has that secret of the LOM circuit already leaked into the public domain?

Cause I find Lom sound better than Micbooser in my humble opinion.

Good weekend!
 

The Primo EM273 is similar to the EM272 but with higher SPL handling (135 dB vs 119 dB). Also, the simpleP48 doc has a few ideas about increasing the SPL headroom of some capsules.
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The LOM basicUcho have a slightly different capsule mounting (flush, vs the slight rim of the Clippy case), which might account for some of the sound difference. I always flush-mount the omni capsules in my mics.
?
?
 

The Primo EM273 is similar to the EM272 but with higher SPL handling (135 dB vs 119 dB). Also, the simpleP48 doc has a few ideas about increasing the SPL headroom of some capsules.
EM273 is a 3-terminal version of EM272.? ie it is EM272 modified as on page 12 of SimpleP48.pdf dtd 29sep24 for use in SimpleP48RCA.
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This, with EM273 has MUCH better overload performance and should be used if you are having overload problems.
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I'm playing with some LTspice sims of SimpleP48RCA and it looks even better than I thought; at least in SPICE world :)
 

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EM272 and EM273 appear to be exactly the same element with a different wiring. The 2-wire version has higher sensitivity, because of the gain of the FET in common-source mode, when the lower sensitivity of the 3-wire version is the result of the FET being used in common-drain mode.
In simpleP48, the circuit is common-source, so there should be little difference between a native 2-wire capsule and a 3-wire.

However, the Jerry Lee variant allows decreasing gain at teh benefit of max SPL.
This can be done only with a 3-wire capsule (or a Linkwitz modified).

Le 14/02/2025 à 20:55, kennjava a écrit?:

The Primo EM273 is similar to the EM272 but with higher SPL handling (135 dB vs 119 dB). Also, the simpleP48 doc has a few ideas about increasing the SPL headroom of some capsules.
?
The LOM basicUcho have a slightly different capsule mounting (flush, vs the slight rim of the Clippy case), which might account for some of the sound difference. I always flush-mount the omni capsules in my mics.
?
?
 

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