The Adcom 2535 was essentially two of the 535 power amps on one chassis, which means that it could drive two pairs of speakers (left and right front; and left and right rear), or you could bridge the "B" amp for use with a subwoofer or center channel. The amp was manufactured before there discrete 5.1 channel HT, so there was no center channel at that time.
You are correct about the power breakdown: either 4x60 wpc, or 2x60 + 1x200 wpc. If you bridge the "B" amp, then the amp becomes a 3-channel unit. I sold Adcom gear about 10 years ago, including the 2535 and 2535L ("L" stood for "level control" -- there was a potentiometer screw on the back panel that allowed you to adjust the bridged amp for use with a subwoofer), and I remember most of the operating details. Feel free to drop me a personal E-mail if you have other questions.
