Class A power amp will give the best BASS SLAM?


I've been trying out various amps, looking for smooth highs obviously, but what power amp will give the best, tightest, bass slam? Let's try to keep the used price below $2000. Your input is appreciated!!!
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I agree with Gmood1, preamp does make a huge difference in what you hear from your amp.

Speakers clearly matter in getting slam... As amps go, it's all about voltage, higher rail voltage gives slam... Inexpensive amp that with give great slam and very good micro dynamics is the audiosource amp 300... Does a pretty fair job on everything else as well... And it's low ohm drive capability is ridiculously good.