I had the chance to demo this IEM for about 2 weeks by participating in a loan tour, organized by a member of the community. I would like to thank him for the opportunity ! As a disclaimer, the sources used with the FiR Audio M5 are the iFi Micro Black Label and Sony NW-WM1A. I found the M5 to be fairly resistant to hissing, which makes it quite versatile with sources (big bonus if you're not sure your DAP or DAC/AMP is quiet enough). I also found the comfort to be quite good for long periods, as I did not get any pressure build up whatsoever. Stock...

I had the chance to demo this IEM for about 2 weeks by participating in a loan tour, organized by a member of the community. I would like to thank him for the opportunity ! As a disclaimer, the sources used with the FiR Audio M4 are the iFi Micro Black Label and Sony NW-WM1A. I found the M4 to be fairly resistant to hissing, which makes it quite versatile with sources (big bonus if you're not sure your DAP or DAC/AMP is quiet enough). I also found the comfort to be quite good for long periods, as I did not get any pressure build up whatsoever. Stock...