OTL Amps and ProAc Speakers

I haven't had any experience with that particular combo ,but with an Atmosphere M60 and Proac 3.5.I was amazed how dynamic and still very musical ,a match nearing heanen.There's magic in those OTLs provided the load is fairly simple/not a complex crossover.Good luck!

Hello JLA- I have a GM20, though a special European version. Though OTLs usually prefer higher impedance speakers with at least moderate efficiency, my GM20 is amazing on my 4 ohm Venture speakers. It seems much more powerful than my 50W SET amps. The only consideration with the GM20 is that it has a lot of gain which can be great if you're using a passive or low gain active preamp. The only issue with the 1SC would be trying to overdrive them with alot of deep bass. I've heard the 1SC bottom out when driven hard. Other than that, it should be a great combination. Good luck.

I have owned/own a couple OTL amps, Atma-sphere M60,s and I currently own the Tenor's and I also own a pair of the 1sc's. The OTL's are a fine match. The proac has a fairly flat impedence curve and the OTL's like this. While I don't have specific experience with the Graff I think it is a safe bet to sound good.

Thanks a lot you guys for all the great info! I am looking forward to entering the OTL space...should be fun.