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Do I need a dedicated, shielded sub cable? (1 Viewer)

Steve Carlo

Stunt Coordinator
Joined
May 6, 2003
Messages
71
My computer's speakers have a sub and two mini speakers, no shileding on the cable. Then I see BBuy selling subwoofer cable which appears to be nothing more than co-ax (75 ohm I assume, overkill for a TV signal unless you are going over 30 feet) with a couple of RCA connectors on it.

I can solder, know how to wire an RCA connector...is there any benefit from buying ready-made and is the shielding really necessary? After all we don't shield our speaker wires!

Thanks
 

Bob McElfresh

Senior HTF Member
Joined
May 22, 1999
Messages
5,182
You dont shield the speaker wires in a HT system because they carry WATTS of power. This tends to swamp any RFI/Noise.

Yes, for line-level signals, you typically use coaxial cable.

Your PC speakers are ... a bit of a hybred.

They dont carry lots of power like a HT system would, but the signals DO carry more wattage than ordinary line-level signals.

In truth, you dont need shielded wires going from the subwoofer box to the speakers.

But from the sound card to the subwoofer (which I assume has a built-in amp), you would LIKE this cable to be shielded. This is the PC version of a line-level signal, and the cluster of connectors right behind the computer is a very noisy environment.

But space is at a premium for full-sized RCA plugs on the back of a PC, and many PC speaker systems have a small crossover to ignore any noise above 24 Khz (and there is a LOT of higher-frequency noise in the back).

So this is why many PC speaker systems get away with the 1/8 inch stereo plug.
 

Steve Carlo

Stunt Coordinator
Joined
May 6, 2003
Messages
71
Thanks Bob. I guess I'll put together my own cable then, no point in buying something I can make for 1/4 the price!
 

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