I just bought the SET 120 amp and paired it with a 20+ year old AVA FET Valve EC preamp. My speakers are a new pair of Zu Audio DW6’s with an REL S/2 subwoofer. These speakers ROCK with this SET up (pun intended). Center imaging is stable, transparent and powerful. On many rock recordings, the vocals, bass and drums comprise the center image, and whether I’m playing jazz, blues, folk, classic rock, grunge, or metal, the sound explodes out of a silent background and delivers emotional and sonic impact. Very impressed. The dynamics and fullness of the sound are like being at a live concert. Much of this is due to the character of the DW6’s, but the SET 120 makes them sing beautifully.