I was always impressed with the Sens and Singlepower. Are there any who've been using an SP amp with the HD-800s? I've ran them and the T-1s through my Extreme and was very impressed with the full sound. I was wondering how they sound on a MPX, Supra or Maestro? This thread is intended for those of us who still have a SP amp. To any new members, Singlepower was a ripoff and stole many members money without a product and built some shabby amps by design and part selection. But they also made some very good sounding amps for the day. Caveat noted.