using RG6QS cable for subwoofer line in

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vinylguy

vinylguy

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Joined 2009
#1
I have my speakers and TV on an adjacent wall to my electronics with a hallway in between. This has forced me to run wires in wall to hook everything up. Over the years my system has changed and I'm faced with a situation of either using RG6QS to hook up a sub through its line level inputs or using the speaker level inputs of the sub(with speaker wire, of course). My understanding is that a line level connection will be better quality. I use my system almost exclusively for music. I'd appreciate anyone's thought and experience on this
 
#3
Many would say that a line level input to a powered sub is better than a speaker level input.
But a speaker level input does not need to be shielded.
If you are buying co-ax cable to be run to a sub-woofer, RG6QS (quad shield) is a poor choice.
RG6QS is designed for cable & satellite TV signals.
But RG6QS will work if it's already installed.
 
#5
Glowbug said:
Which are significantly wider in bandwidth than our lowly audio stuff...
Click to expand...

And optimized for a significantly higher frequency band.
Quad Shield is best in a frequency band from about 50MHz to maybe 1 or 2 GHz.
Quad Shield is less desirable and both analog and digital audio frequencies.

It also depends on how you define bandwidth!
 
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#6
And optimized for a significantly higher frequency band.
Quad Shield is best in a frequency band from about 50MHz to maybe 1 or 2 GHz.
Click to expand...

Can you elaborate on that?

I've used it for feedline for HF radio use for a time (1.8-30MHz), while there was an impedance mismatch from being 75 ohms, it did have lower loss than RG-8X. Perfectly acceptable for under 50MHz, provided the run was under 75 feet or so.
 
#7
Because Quad Shield is designed for a frequency band from about 50MHz to maybe 1 or 2 GHz, the shield works best when the interference is in this range. They trade off low frequency shielding for high frequency shielding. They also chose a center conductor and insulation that work best at high frequency while keeping the cost low.

A Belden paper on co-ax. Just ignore the big word acronyms:

http://www.belden.com/pdfs/Techpprs/CoaxialCablesandApplications.pdf
 
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