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any problem with 10' run of these wires together?

373 Views 10 Replies 6 Participants Last post by  jackshakes, 
S
struggling with what to do about the wires in my upcoming HT. my seating area is about 10' back from my set which will sit on top of a salamander triple20 ( www.salamanderdesigns.com ). anyway, on my left side, i need a 10' run of...


1 subwoofer cable

3 speaker wires (surround side left, surround rear left/right)

1 telephone wire (directv receiver)

2 cat5 cables (xbox, spare)


are there any problems with these being groupled closely together and running along the base of the wall for about 10'? any interference i need to worry about?
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No problem at all.
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M
Not at all. All are low voltage.


You don't want low voltage running in parallel with high voltage / electrical wires.
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T
So when the phone rings...with that 90V 20 Hz ring signal...isn't that high voltage?
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J
Tony ... you must be in IT as well ... to us, anything above 12VDC is high voltage :)


The phone ringing won't be an issue because there isn't enough current being pulled to cause a strong enough EMF to interfere.


with car audio you always have to be careful about your amp power cables, even though they're only 12V DC, but there you're dealing with much higher amounts of current (and usually dirty power too).
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Quote:
with car audio you always have to be careful about your amp power cables, even though they're only 12V DC, but there you're dealing with much higher amounts of current (and usually dirty power too).
I think you missed the fact that it's DC. How would a static magnetic field induce any current into a signal carrying conductor?
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J
Because *most* alternators don't generate true, clean, dc power ... so the magnetic field isn't static.
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Quote:
Originally posted by jackshakes
Because *most* alternators don't generate true, clean, dc power ... so the magnetic field isn't static.
How about that big black box...the battery...doesn't that produce DC?
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J
not while the car's running ... the battery is only used when in ACC mode, and when starting the car. After the engine is running, the alternator puts out between 13v and 14.4v to recharge the battery and power the electrical system.


The alternator creates AC power that is then passed through a rectifier to convert it to DC (and then a regulator). This is why you don't get super clean DC ... the rectifiers (and regulators) in most cars aren't super high quality ... they don't need to be, most electrical components in a car don't care or condition their own power.


Now, the battery does act as a sort of capacitor, and will cut out some of the noise, but it will mainly clean out the lower frequency noise and not so much the high.


I learned all this when I installed my first car stereo back in high school ... I ran all the cables down one side and had this nice high frequency noice in the speakers. An installer at the store i worked told me to run them down separate side, which fixed the noise ... but I didn't learn *why* until college.


But anyway ... this isn't really the point of the thread ... so are we done here?
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Quote:
Tony ... you must be in IT as well ...
No need to insult ;)


I'm an EE...sounds like you paid attention in school too.:)
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J
sorry bro ... didn't mean that IT crack as an insult. I'm an EE also ... but I work in IT ... one of the sales guys who works here made a crack once about "You IT guys think anything over 24V is high voltage" ...I thought it was pretty funny because it's almost true.


Anyway, no offense meant.
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