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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Look for Threshold SA/4e stereo. Pure Class A power amp.
Don't let the 100W fool you. This amp will drive anything.
Spend a few more buck . Should be in the $2600-3K range.
Bedini 100.100. It blow me away what it did whan I mated it with my Infinity Monitor IIa's (they are table flat to 22Hz). I had tried 10 other amps with them, and none brought the low end to life like the Bedini.
I agree with Gmood1, preamp does make a huge difference in what you hear from your amp.