A late hit, for posterity and validation. I used a Kenwood KA-3500 with Advent "New Large Advent" loudspeakers for a decade, and believe me it was loud enough for any normal listening purposes in just about any residential room. That Kenwood still works fine with nothing more than a DeOxit treatment, and I ran it with limited ventilation at high listening levels...a lot.
Yes, bigger amps with more headroom congest less and provide more dynamics, and pose less risk of tweeter-killing clipping, especially if you are looking for "reference" loudness (whatever that is--but, say, peaks in the 105-110 dB SPL range). But at any wife-approved loudness level, the Kenwood will perform admirably with Advent speakers.
Rick "the Advents do dip into lower impedance in places, but the Kenwood will handle that with no issue" Denney