I have tried a lot of amps for my Infinity RS 2.5 speakers, and about 20 years ago settled on the NYAL Moscode 600 as having the detail, power and ability to deal with the low impedance. Plus it has a slightly warm tube openness, probably from the tube driver circuit. I suspect the Moscode 300 might be adequate and I have a friend who said it was even more detailed, but it's not the one I found.
I did try using an original MC-275 for the highs with Adcom 555 on the lows about 25 years ago, and that was NOT the answer. I preferred the 555 full range.
I did try using an original MC-275 for the highs with Adcom 555 on the lows about 25 years ago, and that was NOT the answer. I preferred the 555 full range.