I'm going to throw in the towel on telling myself I'm going to pull the boat to Earmark one day to have it tuned ...

Does anyone know anything about the SMD DD1? My main concern is this ... Does it only detect the amplifier itself sending a clipped signal OR will it also detect distortion coming from upstream that the amplifier then passes on?

My goal would be to use it set gains across the board (as been discussed in many threads). I know it can be done by ear, but i don't trust myself. I've done it by ear and it's loud, just bothered that I don't KNOW it's at full potential.

Is it worth buying or could this be borrowed?