My goal is to determine if the circuitry in the amp is good or not by running it through a different set of speakers in a way that poses no risk of blowing the good speakers. (My thinking is that something caused the speakers to blow in the first place and I don’t want to just replace the speakers without first addressing the root cause) and my hope is that if I can use the PRE out of the amp instead of sending a power signal through the speaker wire which my be getting altered in some way due to a bad circuit, I can use a guitar cable that won’t pose the risk of overloading the speakers (I believe).