Interconnect Subwoofer Composite THX vs. Composite Subwoofer Cable??

Any cable similar to this would be a good option. No need to spend a huge amount of $$.

http://www.monoprice.com/products/pr...ormat=2&style=

The subwoofer cable is carrying a line level analog signal. Any RCA terminated coax cable will very likely work. Nothing fancy is required, nor will you hear magical revealed sonic purity with the more expensive cable. The cheapest cable from RS or BA will work fine.

If the run is very long, many tens of feet, you might want to avoid video coax with a steel center conductor. But these are not usually whats in the bubble pack.

Digital audio coax is 75 ohm coax (RG6 or RG59); the same as your cable TV feed except it has RCA pin plugs. But analog audio does not require 75 ohm coax. Any RCA terminated coax, even the skinny stuff that came with the DVD player or TV will work for a subwoofer.

Try the cheap stuff! What have you got to loose?

Digital audio, composite video and component cables should be RG59 or RG6, which makes them 75 ohm by spec.

Although 'regular' analog audio cables are not required to be impedance matched, it is usually recommended to use good RG59/R6G type cable for subwoofers to help with minimizing potential effects from RFI/EMI.

In other words.... if you have a "yellow" composite video cable laying around, it would be in your best interests to use that as opposed to any "skinny" red/white audio cable.

I've suggeted that line level signals in the audio range do not require RG59/6 and that other coax cable will be good enough. Everyone has these cables around. Why not let them try it, rather than speaking of their "best interests". They may not work but little time or money is lost.

Could you explain why RG59/6 is better at RFI/EMI rejection than coax of any other kind or impedance?

Bluejeans has an article attempting to demonstrate the need for and superiority of double braided coax for analog audio. Although they note that it may not be best if there is an RFI problem. The BJ article is long on words and short on measurements of any import to their argument.

They article also says that a twisted pair will not work in an unbalanced line. Put it to the test (I have). Make a twisted pair terminated with RCA pin plugs. An easy way to do that is to have someone hold one end of a pair of wires, pull them straight, insert them into a drill chuck and slowly twist them. Use it for a subwoofer or other line level analog audio connection. Dress it away from power lines, dimmer switches, and similar significant noise generators. Does it work?

Some argue in this forum and elsewhere, that today's A/V hardware is somehow more susceptible to hum and other noise than that of olden times and thus needs "better" interconnects. A moment's reflection will show that to be untrue. Switching power supplies, RF up through the giga hertz range, dimmer switches, etc., combine to make for a much noisier environment, yet most of us don't hear any of it. Is it because we are using quad shielded RG6 or because our audio hardware is good enough when it comes to rejecting noise?

Is it possible that a subwoofer cable could be the entry point for RFI? Certainly. Might it be audible? Yes. If you hear the local AM station it might be the cable.

Whatever...
the poster can use/try any cable he chooses that have RCA connectors on each end. IMO... buy a good sheilded coax cable for ~$10 (or make your own) and be done with it.

Here's another BJC reference:
"The Coax for Subwoofer: Canare LV-77S
The most important issue in subwoofer interconnect cabling is minimizing electromagnetic interference (EMI) from such sources as power cords, transformers and fluorescent lights. Although Belden 1694A's braid/foil combination is highly effective at dealing with a mix of EMI and RFI (important at the higher frequencies digital audio and composite video involve), Canare LV-77S, with its heavy double braided shield, is more effective at keeping out low-frequency noise that can make your subwoofer hum."

What a total buch of crap, Retailers will tell you anything to make a buck...