The headphone impedance of the Heil Pro Set is 200 ohms, not 8 ohms. 73, Barry N1EU > ----- Original Message ----- > From: "Vincent Sgroi" <k1rm at sbcglobal.net> > > Does anyone have a method that matches the output of the Orion 2 to the > > Heil Pro set earphones. I believe the O2 has a 600 ohm output and the > > headset is 8 ohms.