The OP and I have communicated since his M4TS arrived in his system as I am also an owner of the speakers. I absolutely share his impressions. After having a number of speakers in my main system over the past few years -- too many to recall, the M4's are simply the most fulfilling speakers I have had in 45 years in search of the Absolute Sound. I never say never, but at my age, I can't imagine better sound reproduction than I am hearing from the M4's given the cost of the speakers. Both the OP and I have relatively small listening rooms so the M4' are room-appropriate, but if you you have a more expansive room, the M3TS would give you a fair bit more LF response. I am really enthralled with the sound of the M4TS's. They are tube-friendly speakers, but like the OP, we both like the performance of them with more robust power. I am driving them at the moment with the Nuforce ST10 class D amp, with 150 wpc, and it is a match made in heaven. Cheers, Whitestix