I have been looking for a headset for my IC-9700 and read that many are very pleased with the Koss SB-45 (SB/45) PC headset with electret microphone element.
I got one for 20 EUR via the Swedish eBay site Tradera. I made a DIY adapter for the Icom standard 8-pin Mic connector – just connected pin 7 ”Mic ground” and pin 1 ”Mic input” to a 3.5mm female connector.
This is the pinout for the Icom 8 pin connector:
Here are some very short audio samples – first with the standard Icom mic and the second with the Koss SB-45. I’m using USB and maybe not exactly on the correct frequency when I did the recordings:
Some useful links: