A lot less than people think. A lot of people talk about old school amps being underrated by freakin tons but it was usually not more than a few percent. If I had t guess Id think maybe 60 per channel. maybe a little more. I ran all PPI for a while in the 90s and it all sounded great but when I made the switch to another manufacturer I was astounded by the power the new company put out.
Not really, considering what you can buy new. The 4200.2 is rated at 25w x 4ch. Maybe $75-$100. PPI has always been looked to for SQ. The were never intended to be a "cheater amp" with rediculusly low impedance abilities like the Orion, U.S. Amps, etc.