its the cheapest $$ mic i found in radio shack..... 4-6 bucks, what i did was let other ppl wear my helmet and read to me.... this way i played around with volume and got to hear what it sounds like out side, once i was happy with the settings, i recorded my self with different equipment ( tape recorded,computer,camcorder ) and read out loud the same book to get audio feedback on what i sound like........
Lol i am enjoying helping u out!!!!!!