I didn't think about that but I will be careful on the gains. As for frying a PPI amp, I did that last year to my 2150AM. It had been in storage since I ran my Honda CRX under a Toyota pickup in 1994. I bridged it to run a 15" sub and it lasted about 2 minutes before the magic smoke was released. I've read from guys who repair amps that some older PPI models have caps that will not last 20 years.One thing you will want to be careful doing is using a vintage amp with a modern head unit. I attempted to do this by using the very first amp I ever had when I was 16 with my new Pioneer HU. The Pioneer has high volt (4V) pre outs and the amp couldn't handle it. It would go directly into protection mode the second it turned on. You may not have this issue with your PP, but just be prepared to purchase a new amp if it doesn't work.