The last time I shopped for speakers, I visited a dealer to audition (if my memory serves me) a pair of Magico S5's. The salesman initially drive them with a very powerful, very high damping factor solid state amp and it seemed like the S5's it didn't have much bass. When the "high end" listening room became available, he powered the S5's with Audio Research tube power amps and the bass was dramatically more prevalent and musical.
