question regarding Receiver and subwoofer

udi.zam

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Oct 3, 2017
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Hello,
i've read couple of questions regarding connecting my receiver to the sub, but couldn't find the answer. yet.
so my receiver (Onkyo) has coax output to the sub, and my sub has both coax and 2-wire input.
BUT
the problem is that the receiver is quite far from the sub and the wire goes through the wall (it's a new house) meaning even if i would find 30 ft. coax wire, i wouldn't be able to insert it to the in-wall pipe.
so, the solution i'm seeking of, is how to convert the coax out to standard 2-wire, and then back to coax.
i've read that it's not recommended somewhere, but still could find a dedicated product
http://www.ebay.com/itm/Speaker-Wire-A-V-Cable-to-Audio-Male-RCA-Connector-Adapter-Jack-Press-Plug-/262896922641

what do you think?
 

udi.zam

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Oct 3, 2017
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unfortunately i did, but a strong low wwwwooooo.... is coming out of the sub (do you know what is the technical term for that?). i think it may be a grounding problem as when i touch the sub it improves (wwwoooo.... is dramatically reduced).

Anyway, i'm supposed to be an electronic engineer so a bit embarrassed i can't find the reason by myself :no: i know that coax should simply be a better shielded signal so maybe running the sub signal through a 2-wire for such a long way is a problem. on the other hand, sub is for <150Hz frequencies which do not tent to suffer from noise.

 

udi.zam

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Oct 3, 2017
4
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running speaker wires through he wall simply mean that when building the house, hollow pipes where embedded in the walls running from the receiver should be, to all where speakers should be (2 front, 2 rear and sub). that eliminate the ugliness of wires running around the leaving room.
there's no connectors. just a preparation for the standard 2-wire speaker cable, but the coax connectors that are usually a bit bigger just don't fit in the pipe.
 

udi.zam

Prominent
Oct 3, 2017
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i've run the wires through the walls, but the sub i/f is coax so i must somehow convert. i'm also wondering if using 2-wires instead of coax is good in general. coax cables are usually used for digital signals (low power), while the 2-wires for speakers are used for analog with rather high power.
 

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