As crazy as it sounds the new Adcom GFA 555SE ran a pair of 1.7s at my friend's store. He is not an Adcom dealer but for $1299.00 retail new it is a bargian. It does sound much better than the origial 555 and the 555 II. I am not much of an Adcom fan but this new amp now has a much better driver input board, has balanced inputs and has better output devices than the previous Adcom models. It was a shocker how well it worked with the 1.7. It actually had real bass and I like it better than any of the new digital amps. 200Watts per channel and 2.5 db of head room and stable at 1 ohm which means lots of current and the 1.7s like lots of current.
