Can IC's and Speaker Wire drastically affect bass?


Hello All: I'm very sorry for the long post. But I need input!
My System: McIntosh MA6900 Integrated (Flavor4 PC); Simaudio Nova CDP (Chimera AdvantageII IC/Flavor4 PC) plugged into Shunyata Hydra4 w/Copperhead PC; Definitive Technology BP 7002 speakers (Analysis Plus Oval 9 speaker cable; FIM outlets

Listen to mostly Classic Jazz, some R&B and Progressive Rock

Room: Family Room (rectangular shape) Dimensions: 10ftx20ftby8ft
Speakers are near one of the short walls (brick fireplace) about 6 feet apart and 2 feet from the corners-but I tried closer to the corners and the bass improvement was not that substantial.

Speakers are full range towers with 12in. subwoofers coupled to two 12" infrasonic radiators./300watt amplifiers
Freq. Response: 15 Hz-30 kHz Efficiency: 92 db

These speakers are supposed to rock big bass: all the reviews and the owners reviews say so. But even when I turn up the bass level control past 12 o'clock on the sub amps the bass does not kick like it should. When I turn up the level controls past on o'clock the bass should be really kicking; it doesn't Even when I put my ear near the subs it just isn't putting out the bass spl's as expected. Since these speakers have powered subs, I had them checked at the dealer and they're OK. In fact, they sounded pretty good connected up to a Denon receiver.

I've tried Anthem, then Marsh and now McIntosh electronics and changed from a Jolida JD100 source to the Sim Nova. I added Analysis Plus Oval 9 speaker wire a while back in search of more low end too. The one constant throughout all the changes has been the Chimera Advantage IC's.

I've spoken to Steve at Cable Pro and he has suggested twice that I try changing out various IC's and possibly PC's as well. He's not familiar with the Flavor4. (I have a JPS AC+ that I tried on my amps but it did not have an affect on the bass so I went with the Flavor4)Steve suggested I try the JPS again. He's also mentioned that the Analysis Plus can work very well in some systems but when it doesn't work it lacks bass.

Question: can changing IC's and speaker cable really change the character of a speakers bass power that much? Would I be better off just selling the speakers for some different bass mongers?

I'm willing to try Cable Pro but I'm also seriously considering some Ohm speakers. Want that bass from a full range speaker! And I'm no longer interested in trying subs. If I go with speakers, a home audition is a must. Your input would be appreciated! Thanks
foster_9
It sounds like you are having problems loading the room or phase related issues with the subs.You must realize that it takes a certain length of room to establish low-frequencies.If the room is not long enough,it is virtually impossible for the wavelength to form.If the woofer is close to the floor,it can be absorbed or over damped by carpeting/floor material.IMHO,it is better to reflect/diffuse the wave-front,then to try and absorb it with soft materials.This generally leads to a soundstage with fewer height clues and softened dynamics.
Absotively, posilutely, the cables will affect the quality of bass. Especially since sone to many middle-of-the-road and even higher-end cables induce much time smear.

Still, the overall quality of bass reproduction is even more related to the type and quality of amplification that controls (or doesn't control) the woofers.

-IMO
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Thanks to all of you: Philbrady: Yes, the 6900 is plugged into the wall. I have HSU subs hooked up to my pre-outs. Tigermtn: these speakers are not biwirable as other Def Techs have been. els@hats.com: they are definitely wired in phase. Pmotz: Speaker placement is limited to moving them closer to the wall or closer to the corners or both. I've tried both. There are not other options; it's a small family room.

This evening I re-inserted a JPS AC+ PC that I had re-cooking on a dehumidifier. Removed the Flavor4 from the 6900. The AC+ immediately added more bass to the system- I thought it was fully burned when I first used it. Apparently not. I want to see what happens once it settles in. But for the 1st. time I heard a real improvement in bass from that cord after a lot of previous use.