I have the d/c 10-13.4s and I’ll keep them for pax as they still do the job. Worked well in the Lightwing I had but the Hornet Cub I have now the mic is activating the intercom from engine/ airframe noise when over 5000 rpm ( 912(uls). The intercom which is built into the Icom a220 vhf and I’ve tried all the different settings (mic gain/squelch ect) to no avail and tried the Bose A20 also and same result and that’s why I’m looking at the Zulu 3 with the different mic set up as I still need another headset. I know jack $h/t about avionics so hoping one you tech gurus maybe able to help.