Is it truly safe to adjust down FX AMP Regs?

Exactly correct. I did it for the first time last night after adjusting my reg. too high. After all the warnings about damaging my Crown and voiding the warranty, and then finding out mine had the AMP in it, I still was very worried about doing it. Had to give it a try though, just to see. Worked fine...quarter turn, fire, quarter turn, fire.

Stoti