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A quick demo of what my new Zoom H1E sounds like with the replacement original capsules,
I believe the original capsules are "PUIaudio AUM-4537L-HD-R cardioid" (link: puiaudio.com/p... ) swapped out with the Primo EM272Z1 - superior capsules, in my most humble opinion, as I use these in my SR3D binaural microphone lines, as do some (but not all) other binaural microphone manufacturers, HOWEVER! The Primo are not cardioid but omnidirectional, so you would lose the wide stereo field. In the meantime, I'm looking at other cardioid (uni-directional) alternatives that may be a better alternative.
The modification is quite straight forward, though fiddly, as the wires are tiny and the capacitors on the capsules are also tiny, but I managed to do it being careful, but there is plenty of room and can be done in 30 mins or less.
I've also found a slightly more sensitive alternative to the Primo EM272 here:
www.digikey.co...
With about 7v on the things, the sensitivity is quite a bit more than the primo's in our XLR circuits, I'll be doing some tests with these in the coming weeks.