08-19-10: McondonThe Mcintosh 275MkIV is a powerful amp that shouldn't have any problems driving s speaker with a sensitivity of 86dB. The bass quality is very high when compared to other SS amps like the Plinius SA-100Mk3 that I've owned. I am not familiar with your speakers, and there could be a possibility the perceived shy bass is due to the speakers rather than the amp. Food for thought.
Thanks for the recommendations. My speakers are Sehring 703s (86 dB sensitivity). The preamp is an old Aesthetix Calypso. My current amp is a McIntosh MC275, which I generally like, but it doesn't offer up very convincing bass with my somewhat bass-shy speakers...
By the way, the Plinius amps are dark sounding and quite similar in presentation to the Mac but lose out in finesse and bass depth. I have compared the MC275MkIV and Plinius SA-100Mk3 in my system side by side with an ARC LS16 line stage.