I just recently auditioned these speakers. They were set up with Transparent cabling and Krell electronics. I left that 2 hour session with these observations. I believe these speakers will sound their best with a world class tube amp. These speakers are fast, accurate, with wonderful bass, and dynamics. But, the 'Watt' portion of the speaker begs for tubes (IMHO) to give them that musical sweetness. Without that sort of amp, they can sound a bit sterile.