It's a transistor/IC stage so will be OK with a high impedance load. If background hiss is a problen then put an attenuator between the radio and the phones.

On 11-Jul-10 18:06, halo.net wrote:
Gents,
Would appreciate any comments matching up the TR-7 4 ohm audio output to a much 
higher headset impedance... thinking
about going with a boom mic but headset is well over 100 ohms....
Thanks,
Doc



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