I recently replaced my Parasound HCA1500 (205wpc) with an HCA3500 (350wpc). I finally got around to hooking the new amp up. My Paradigm Studio 100s suddenly came alive. The mids and bass are much better defined; the transients are faster. The 3500 is pure class A for the first 15wpc. The sound is clean and refined. There is no discernable noise floor. I was unsure whether the upgrade would be noticeable...it is one of my best!