Headset Impedance Adapters

JB39-001 Low Impedance Headset Adapter - 5 Ohm Mic - 8 Ohm Phones - Remote Mount The JB39 Low Impedance Headset Adapter - allows a low impedance headset (5 Ohm Mic - 8 Ohm Phones) to be used with a regular aviation audio controller like the Jupiter Avionics Corp. JA95-001. The JB39-001 operates using the Mic Bias supply of the audio controller and requires no other external power.