Subwoofer Cable
Ok, so in that case don't expect too much, thanks for the quick and informative reply.
You're welcome. I suppose it's all about expectations and how much you're trying to squeeze out of your system. 
i agree witrh sliced bread, i recently changed my subwoofer cable to qed performance subwoofer cable. the bass now seems more musical and deep, and slightly tighter too, but again the differences are subtle.
can i just ask, does the cable to the subwoofer have to be a specific subwoofer cable or can you use a long interconnect?
You can use a long interconnect. I agree with the other replies that any improvement will be very subtle if at all. I suggest you save your money and put it towards some new speakers and electronics where the upgrade will probably be more apparent.
Hey! I changed my subs freebe cable to chord cobra a while back now and i can say there was only a minor improvement but recently i bought wireworld stratus 52 mains cable and there was a realy big imrpovement, sub can now go louder, feels deeper, tighter! I know its prety expensive but it could realy put a smile on your face! 
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They do make a difference, but you may find it less noticable than say standard interconnects between source and amplifier.
I upgraded from Monster to QED signature subwoofer cable and noticed a tightening of the bass, but the difference was quite small.
Samsung PS50Q96HD (Screen) | CA 640c V2 (CD) | Pioneer BDP 320 (BluRay) | Onkyo 905 (Amp) | B&W CM8, CMC & CM1 (Speakers) | MA RS-12 (Sub) | Chord Odyssey 4 (Speaker Cable) | Van den Hul - The Name (Interconnects)