I just finished setting up my sound system tonight. I have the Aker 1506 and icomm fitted in the chest. The Aker is well loud enough, You only need it at about half volume. I tried many different set ups and found this to be the best. No feed back at all. I changed the mic for a slightly better quality one with an on and off button fitted so you can suit up and then turn on the system at the final end of suiting up.