low volume

Hopefully someone will be able to shed some light on this issue for me. We are on a 700MHz P25 II system, running APX 6000XE and APX 8000XE radios for our fire department. We just finished a major project where we performed an alignment, added Group Services via FLASHPORT dongles and...

I just purchased a used Pro-652 on ebay and everything works fine with the exception that the audio output is very low compared to my GRE PSR-600 which theoretically is the same radio. The audio quality is excellent but the volume is low even with an external speaker. I did notice that in the...