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Usher cp-6381, lacking in bass?

First I will roughly describe my system
Usher cp-6381 speakers
Krell s350 cd player
audio research ls2 preamp
krell kav250a power amp

My listening room is less than ideal I know but it is what it is. It is basicaly the sun room or Florida room and is made up of windows all the way round including back into the house, floor is ceramic tiled. Speakers sit on rugs on spikes on their cast iron bases about 12 feet apart and about 10 feet from my normal listening position.

I find the soundstage and voices to be impressive, however the lower bass is not, what is there is nice and tight but does not seem to go overly low. I also realise the amp is really a home theater amp hence the kav monicker but it was available and affordable...lol.

Room and layout cannot be changed for practical reasons at this stage so what might anybody more seasoned suggest to try and increase lower bass response and punch a little bit?
I mostly listen to hard rock both old and new.
Preamp? Power amp? CD Player, Speakers?
Any or all could be my concern, have had this setup like this for a good 2 years and am happy but just would like to take it to another level if possible without a second mortage!
Thank you

128x128uberwaltz
soix
8,768 posts
 
Make sure the guy with the sub has a good return policy.  Heh heh. 

I'm no sub expert, but REL seems to favor speaker level output to their subs if you can do it.  I read a review of your sub where the reviewer preferred it that way for music duties.  Anyway, you'll want to experiment with the crossover and volume to get it to disappear and blend seamlessly with your speakers.  Great speakers BTW.  Always liked Ushers.  Best of luck and keep us posted.  Remember, lift with your legs. 

georgehifi's avatar
georgehifi
10,312 posts
 
uberwaltz

however the lower bass is not, what is there is nice and tight but does not seem to go overly low.

Just a thought I remember reading.
Your problem may be the AR LS2’s coupling cap, there has been quite a bit of talk about changing it on the net. As if it is too small in uF value, it may roll off the bass signal into the Krell’s too early, then giving less low bass. to the speakers.

Cheers George
uberwaltz's avatar
uberwaltz OP
13,381 posts
 
Thank you George
I will research that as well....
rbstehno
1,406 posts
 
I owned these ushers for years and they had plenty of bass. I think it's your krell amp. IMO a lot of the krell amps that I have heard don't  have a good bottom end, similar to carver amps, a lot of power but no lower end.

i did add bags of sand in that compartment below the speaker terminals on the back to tighten up the bass
mb1audio
151 posts
 
" I owned these ushers for years and they had plenty of bass. I think it's your krell amp. IMO a lot of the krell amps that I have heard don't  have a good bottom end, similar to carver amps, a lot of power but no lower end."

For bass, his Krell is the strongest component. I had 2 of them. I can't be 100% sure, but I would say the preamp is the weak component.  
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