I believe the P125 was actually designed by Jim Strickland (also involved in design of many of Acoustat's speakers) primarily for studio use. I never owned one of them but had a Transnova 9505 which was also a Strickland design. A very good amplifier, I probably should have kept it as it was a good performer but aren't very highly valued on the used market. Glad you're enjoying your Hafler amp. Even under Rockford's ownership after DH sold the company, Hafler roduce good sounding products that unfortunately were perhaps not as successful in the market as the earlier Dynaco branded products.