Re: Connecting powered speakers to a sound card
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Wed, 26 Dec 2007 17:46:49 -0500
Rod@Hillhead wrote:
Hi,
I have just run cables around the house with the idea of sending audio
output to various powered speakers from the PC's sound card. This
works well with the shorter leads which use standard cables bought
with jack plugs fitted. The longer cables are made from high quality
twin speaker cable, with jack plugs fitted by me. The output from at
least one channel is faint and there is also a hum heard. My question
is whether this is most likely due to the fact that the speaker cables
are not screened, or is it more likely that I have a bad connection in
the jack plugs or other cable joints ( I have had to connect the jack
plugs to a short length of thinner wire as the speaker cable is too
thick)?
The line level signals travel this sort of distance through almost any kind of wire, so I doubt the weak signal is anything but a broken wire or bad connection at one end. These are rather high impedance signals, so fatter wire does little good, and increases the capacitive load across the pair and to the surroundings.
However, such signals are only a volt r so, and will pick up less competing hum when running near power lines in the walls, if they run in shielded wire. A shielded twisted pair (signal and ground in the pair) would work best, if the shield is grounded only at the receiving end (shield and ground conductor of the pair connected together at the receiving end, shield unconnected at computer end).
--
Regards,
John Popelish
.
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- From: Rod@Hillhead
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