Has anyone used a meter made to see distortion for setting amp gains or a oscilloscope to see the ac wave of a 40hz to say maybe 1k hz single to see really how far they can turn up a amp or stereo before it clips or distortion starts?\n\nI was thinking, disconnect your speakers and play a 40hz tone from your AVR. Then using a proper meter or if a tool is made turn on your system volume reading its ac output, measuring with a oscilloscope until you see a clean sine way of given hz goes to a square wave. Then at which you would have a max volume setting you could set too with out sending a dististored signal to your speakers from amp. After that set the volume to the level found just below distortion and run your RCA cables to a subwoofer. Then read the output of amplifer in subwoofer, adjust gain of sub dial until meter read distortion. Gain set properly and knowing you're getting max output from amp without distortion and would never blow a sub ever again. The reason I thought of this was cause we set gain on a subwoofer it's in prime location after doing subwoofer crawl to read 75db spl at listening postion. But we may have to turn up gain to far and it could be adding distortion. I don't own a type of meter above but I am gonna research one. Wondering if anyone has went this far or thought of this. Thanks.