I have the CMC-8's. Ear mounted. My favorite and most used stealth mics.I've also used them as hanging mics and have taped the to walls and poles.. So stealty that I've had conversations with security numerous times and they still don't see them on my ears just under my hair; no hat, no glasses either.
Suggest these settings.... 9volt battery box with stereo adjustment knob, have the sound adjustment on M1 set at max 10 and adjust levels to -12dbs using the knob on the battery box, have the mic atten switch 'on' the M1, record Line In always for music - I ran into distorition even with an acoustic set using the Mic In. Finally, I've never needed a bass roll off option on my battery box for these mics. I've also haven't need to preamp built in option either on the battery box. These cariods do a good job filtering out noises from behind and the sides so try to keep the mics still or stationary for an even sound.