best amp for BASS

What great advice!Put the money back in your wallet and take a good look around.What you probably need to do is start to "see" the sound with a rat shack meter and a test disc.Or better yet a signal generator.You mentioned the bass was not up to par, is it weak ? Do the subs max out and make a mechanical distress sound ? How are the four twelves wired ? Do they have an 8ohm load (which would lead me to believe they are series -parallel.Not that Krell amps are not the answer some day, always look further to correct the problem.Sounds like a great system and a whomping big room.Amost willing to suggest old JBL scoops from the pro audio world for that big ol' room of yours.I just built some subs using Adire Tumults with some Adcom 555mkII's and they fit the bill.You may need a parameteric eq to remove room modes and really start to hear the bass.Good luck and post your solution.

Try the Crown K-2, maybe two K2's in bridged mode. Although it's cheap I expect that it will outperform a Krell 600 or 650.
I use a Crown K-2 for my Wilson Audio WHOW sub which complements my Watt/Puppy 5.1. It has fantastic control and power. As the WHOW is a mono sub I use the K2 in bridged mode. It has 1600 Watt @ 8 ohms (2500Watt@4Ohms). Damping factor is above 3000!
List price of a Crown K2 is about 1800$ only.
Use XLR connections with the K2 if possible!

Geez,I'd love to have a Krell for Mains let alone for using one just as a Bass Amp.

I always thought Bass was the easiest single driver to drive provided you have a high Watt capability along with good Damping Charctheristics.

Just thought Krell might be alittle of overkill for a Bass amp.

How about an older MUSE or as someone aluded to the McCormick's. Anyways,just thinking!

His speakers are 4 ohm rated, the specs. call out a minimum of 350 watts a channel and bass output is rated 110db at 18HZ.

Dave

Thanks for the inputs.I do use balanced connectors.The bass is very clean not boomey but not powerful.My guess is that having a large room with very few walls(the size was describing floor not the enclosing walls) will require lots of current with fast rise time,and large power supplies.I agree the best approach is auditioning different amps.However this is difficult if you do not want to pay retail and you are buying on audiogon.I did hear the Loreley speaker with Crown amps,definitly inferior to Bryston.I do not like the Krell amps for their highs and mids,but maybe for the bass they will be good what about the FBA600c?
Thanks for the responses.