a pair of accusonic MB800 monoblock amplifiers, similar to Marantz MA 700's. Power at 8 ohms 200 wtts, at 4ohms 320 wtts. 2 units bridged 650 wtts, into 8 ohms. Frequency response 10 Hz, to 100 kHz. I ussed them in a system with a McCormack and they blended well together. Retail for $1098.00 a pair, asking $425.00.