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.
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