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If you're not afraid of tubes...the Quatro is unique in that it has a near perfect 8 ohm impedance across the entire frequency range. This makes it very well suited to vacuum tube amplifiers.
Given your budget I'd recommend choosing a good tube amp that makes in the neighborhood of 100 watts per channel, although quality matters more than quantity with the Quatros.
I've heard them sound quite beautiful with Audio Research amps. I'd imagine any of the more open and clear tube amps like, Atmasphere, Manley and VTL etc., might work nicely. I usually prefer ss but in this case, tubes might be the ticket. If you prefer ss, the McCormacks usually work great with Vandy's. I'd imagine BEL and Threshold would work well too.
I am pretty comfortable that Richard would say the Aesthetix Atlas amp is about the best choice for the Quatro, its pretty new and to be reviewed soon,
It has the fikters built right in so you can rid yourself of the external ones and get back a bit of cash and Richard had input on this amp with its creator.
My dad bought one based on this info and Richards enthusiastic suggestion and it sounds great, its hybrid and runs around $8000 I think, its a winner!
i have settled with dual Meridian G57, but 1 also works fine. I think, they make especially good combo with any Vandersteen speaker. Midrange is not sweet at all, but dynamic and transparent. Bass is solid and tight. Highs are clean. Have tried other brands as well, including expensive Plinius, Krell, Manley - do not like them at all with Vandersteens. Audio Research is good, but i prefer Meridian even to Refs.
acoustic cables - OCOS, interconnects - top Kimber KS.