Poorly driven speakers that sound good loud most likely will not "suck" at lower volumes, but bass levels may suffer resulting in a less satisfying presentation at lower volumes.
I went from a 360/W channel relatively low current amp to my current 120w/ch amp with my larger OHMs for this reason.
The 120w/ch amp delivers cleaner, more satisfying bass with the OHMs and Dynaudios at most reasonable levels that I listen to normally.
The previous 360w/ch amp did fine at all volumes with the Magneplanar 1.3c's that I owned for years, as did an 80w/ch tandberg receiver that I used with the Maggies as well.
I also owned B&W P6s that I had to crank to sound right using that high power but low current 360w/ch amp.
I went from a 360/W channel relatively low current amp to my current 120w/ch amp with my larger OHMs for this reason.
The 120w/ch amp delivers cleaner, more satisfying bass with the OHMs and Dynaudios at most reasonable levels that I listen to normally.
The previous 360w/ch amp did fine at all volumes with the Magneplanar 1.3c's that I owned for years, as did an 80w/ch tandberg receiver that I used with the Maggies as well.
I also owned B&W P6s that I had to crank to sound right using that high power but low current 360w/ch amp.