I have a pair of 2805 and I drive them with the Mac 2102, which has 100 watts. The pre amp is the Mac 2200. I have yet to hit the protection circuit, and I have driven to levels that are to loud for my 16 xs 20 room. Quad reccommends no more than 100 watts. Additionally, I have a pair of Threshold SA 2, which provide 100 watts and about 65 amps of current. I had no problem driving the Quads, but the Thresholds were significantly darker than the Mac. A more modern solid state amp may be a good match, but there is something about tubes and electrostatics.