NEVER MIND ALL THE HYPE ABOUT THE HEIL EARPHONES!! GO OUT AND BUY THE BOSE TRIPORT STEREO EARPHONES THE IMPEDANCE IS 32 OHMS!! PERFECT MATCH FOR THE ORION II. BEEN USING THEM FROM DAY ONE ON MY RIG.PERFECT AUDIO, CAN WEAR THEM ALL DAY. COST ABOUT $140.00 73 ! FROM BOB W2PNJ at ARRL.NET