I have a Pass XA-25 hooked to my Tekton Studio Monitors. It replaced a Triode Labs 2a3 amp that I had been using since I got the speakers. As good as the Triode Labs is, the XA-25 beats it handily. Explosive dynamics, wonderous speed and transparency, yet smooth grain-free midrange. Very natural sounding. It's a solid-state amp for tube lovers.