Infinity ServoStatik - need help with subwoofer

Yes, everything is working now!  It sounds great so far.  Thanks for the suggestions.

I plugged them into my Kappa 9 setup, which is a Parasound HCA-3500 for mid and Nakamichi PA-7 for high end.  I'm thinking that a Parasound 806 or 855 would be just fine for a permanent Servostatik amp, and I can experiment with some tube amps on the highs next time I have some $$ to burn.

The SS makes me think that my Kappa 9s have some tweeter issues since the high end seems more clear now.  The bass is a comparison between a single 18" with a dedicated amp vs the 4 12" woofers in the K9s.

There is still an annoying 60 Hz hum, though... there's always something!

I fixed the hum by plugging both amps into the same power strip.  The speakers sound great, and I'm partying like it's 1969!

Thanks again.

I had a set of these. Traded on Infinity RS 11B. I used the old dynamo 80 tube amp for tweeter. Sweet sound. I had Phase Linear for muds. I just got tired of midrange panels going out. There are no longer available so be careful. I would not play extremely loud and of course have Good surge protection. At the time they were state of art. Woofer was mushy there was a panel on eBay. That might be good source for parts. Tweeters never gave a problem. There is original set on Audiomart for 4K. Problem nov replacement parts. Good luck. I have the infinity QRS now  sound is great. I have never forgotten the midrange and highs on system.