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
I'm not familiar with the gear you have, but from a general sense are you sure you have everything hooked up properly? The powered sub could be an issue. If it is not a hook up issue you could have a serious room issue that is absorbing the more noticeable frequency ranges in the bass. If you have a sound level meter, the Radio Shack one will work fine for this, I would check out the frequency response to see if the reduced output is across the bass range or in select frequencies. If it is select frequencies it is a room issue, if it is across the bass range then it probably is a component issue. You could try moving the speaker around if it is a room issue, that can make a huge difference. I really doubt that the cables would make that signifcant a difference, though you could eliminate that possibility by borrowing some from a local dealer or a fellow audiophile. Good luck!
interconnects, speaker cables, & AC cords are all variables worth tweaking: certainly your cabling can significantly affect your response. However so can your rack, shelving, cones/footers, room placement & tuning. Then there's your AC line conditioning and your AC feedline itself. Also suggest trying speakers placement along the long wall which is probably preferrable to the short wall. You have a LOT of variables to play with other than the equipment itself.
Seems rather a puzzler. I very much doubt that cabling changes will take you from no bass to mucho bass.

Random thought, don't be offended that I asked, but are these speakers set up for bi-wiring? Is there any chance that you're just running your speaker cables into the top end and there's nothing feeding the bottom?
I have that amp and have no problem with bass performance. In fact I think it is a major strength. Make sure the amp is directly plugged into the wall rather than conditioner. I use kimber hero and am very pleased with bass performance. I have heard your speakers through ht receiver and thought they provided very good bass. If you do not have the sub hooked up with the sub out feature on amp then try it. I have a subwoofer hooked up this way but rarely use it because my current speakers provide adequate bass response. Not familiar with your interconnects.
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.

check your speaker phase
Here's perhaps a dumb suggestion...but, sometimes the dumbest ideas look at a problem from a new angle.

Do your speakers have powered subs? An amp in each tower? Are the subwoofer amps plugged into their own outlet? Is it possible you have no juice in the outlet due to a thrown circuit breaker? Is the outlet a GFCI outlet that perhaps needs to have the reset putton pressed back in? Do the amps have a protection circuit that perhaps needs to be reset?
Some obvious choices, but sometimes we neglect to look at the most obvious, non-audiophile causes.

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. 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.
IMO, your lack of bass is not due to any esoteric wire. Do you have any bass at all? Are your subwoofer cones moving?

A basic 14 gauge shieled power cord should provide you with more bass than you can handle. Somewhere, your powered subwoofer amps either aren't getting the juice, or aren't getting the signal from your preouts.

OK, I'm done harping.

Good luck.

Tvad: thanks. Yes I have bass. In fact it has improved since I re-inserted a JPS AC+ on the Mac this evening.The Definitive Technology BP 7002 is a full range speaker. Each speaker has a 12in. powered subwoofer. The speakers are not connected to the pre outs, they are connected to the speaker terminals. But I know where you were coming from.
Foster, sounds like something is wrong. With your size room and speakers you should be dealing with too much bass. There pretty much has to be something weird going on. I vote for a wiring issue on the speakers. It is not unheard of for speakers to be wired out of phase see it even mentioned in reviews. If they are out of phase, the pressure waves from the left and right drivers can cancel each other through destructive interference. Have you tried changing the wiring to One of the speakers to see if that changes things? Fuse on the speaker amps? Good luck
1) Have you fed yr room dimensions into a room modes s/ware to see where nulls are (try Rives' site)?
2) Try positioning the spkrs @ 1/4 the way into the room
3) Check spkrs' internal polarity as suggested; use a small battery, the + pole should push the woof outwards.
4) Check the subs' amp sensitivity vs the Mac. You may need to adjust.
4) Finally, to get the wire issue out of the way, try zip, or any cheap single core wire available, as spkr cable. Unlikely, but you never know.
You mentined HSU sub plugged into the pre-out and also that the BP have 12" bass driver, etc.
Are both of these bass systems running together?
They would need serious attention to phase and position to actually enhance the bass in your room. Just a thought.
You mentined HSU sub plugged into the pre-out and also that the BP have 12" bass driver, etc.
Are both of these bass systems running together?
They would need serious attention to phase and position to actually enhance the bass in your room.

Excellent point. Two different bass systems running together could potentially negate one another if the systems are 180 degrees out of phase.

Have you tried completely unplugging the HSU subs...both from the AC and from the amp?
The Hsu subs have a phase switch which I have tried. The 2 bass systems have worked together pretty well IMO. I took my speaks back to the dealer again and a faulty amp in one speaker was finally discovered and replaced by the dealer. The bass in the system has definitley improved and the case seems to be solved. Now I'm looking at a new set of IC's to make further improvements.

Thanks to all for your valuable input!
Good to hear the problem was discovered! It really seemed like something significantly more than a wire problem.