Need help What monoblock power amps for bass?


I own a pair of Silverline Sinfonia speakers.These are very large speakers (over 240 lbs. each),96 dB and 8 ohm stable.Very aesy load for any amp,so power is not mandatory,anything over 50W/ch is OK..
They are tri-ampable.I am looking for opinions on what monoblock amps to use for bass drivers ONLY.Each Sinfonia has two 12" woofers and one 7" woofer.7" driver also contributes to midrange,so this is the trickiest part of my amplification story.I don't want mellow and soft bass,but don't want cold vocals either.
I plan to use either tube or SS monos and limit them whit a potentiometer in order to achieve a tonal balance with midrange and tweeter.Midrange and tweeter will be powered with 320B XLS SET monos (30W/ch).
The areas i am looking for in bass are - slam,speed,definition and ambience.I like fast and tight bass (often connected with SS amps),that is a priority.
Any suggestions will be very welcomed.
audiobb
Krell Evo series...... tight, powerful bass. Krell is known for state of the art bass reproduction. The Evo's Highs and mids are smooth and accurate, then add the remarkable bass. A pair of Boulder 2050 would be my next choice.
sorry.... I did not read the post before mine where you give a price range. The Evo's and the Boulder will be considerably more than you want to spend even used.

I personally would not mix amps if by-wiring, but that's me.

Regards,
Lou
Agreed with Stehno's assessment fo the Nuforce Ref 9SE V2. It kicked the crap out of all previous amps I've heard or auditioned at home. Definitely worth a try. Unbelievable sound from top to bottom with absolute grace, controll and musicality
What monoblock power amp for bass ?

Read:
http://www.enjoythemusic.com/magazine/manufacture/0708/index.html

Now you will know what to look in amplifier to drive the bass and other "things"

Good Luck in your search
Rafael