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
Price range - well,it depends.Sinfonia is tri-wired.So SS monos will drive either one 12" woofer only (one connection),either that 12" woofer plus another 12" woofer and one 7" mid-bass (other connection).

If 30 W/ch 320B XLS SET proves good/very good in bass,then i will let it drive tweeter and 2" midrange,along with one 12" and 7".
That way i will not sacrifice anything in midrange.Bass will still be suficcient if i connect a rear 12" woofer to SS amp.This woofer is configured for the deepest bass.
In that setup i will not go above 3-4 000 $ for SS monos (used).This is top,but i could also end up paying even less.For example ,Wired4Sound 250 W/8 Ohm monos seem good enough for that option.Class D shouldn't be a problem there.

But,if SET amp shows only treble and midrange good enough,that i have to go with more expensive SS amp,as it will be powering both connections (7"+12" and 12").
Then i have to spend more....Pass seems a way to go then.

I will know which way to go when the monos are built.But i have a great confidence in a man who will build them for me.
I think they will prove good enough for everything.I think that tweeter and 2" mid and 7" and front 12" will end up powered by these.I have a great respect for the knowledge of Siniša Trlin.I was lucky to meet him,he thought me a lot about audio.
Since there is no limit in $$ for building these,i think they will be able to stand side-by-side (or surpass) any SET amp,regardless of price.I am very curious to hear them.
Patience is a virtue.
Brystons are great for bass the 7bsst is a great call above, also although you said you don't need power, the Spectron Musician (maybe an older version) are bass monsters, I love the Mac 7270(? can't remember the exact number, it's been a while) for pure bass reproduction.

good luck
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