On my 2007 GL1800 PA I have generous volume through normal speakers. But, when I switch to headsets, I can barely hear the radio until I max out the volume. CB works very well on both speakers and head set. I use same helmet when on my 99 GL 1500SE and no problems hearing either speakers or headsets, so it is not helmet or speaker placement. The GL 1500's have a volume adjustment inside the radio that can add a bit of volume for both if needed. Is this possible on the GL1800 also??? Is there some kind of adjustment for the headset volume???