diy >50' rca cable for subs using speaker wire: yay or nay? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th May 2014, 03:49 PM   #1
diyAudio Member
 
Join Date: Dec 2013
Default diy >50' rca cable for subs using speaker wire: yay or nay?

As it says, I've got about a 30'-40' run in wall to outlets then add 3'-5' rca patch cables at each end this is for powered subs in my home theater. I'm hoping to use standard 16 gauge speaker wire in wall and splice onto some cannibalized rca cable connectors. Is there any reason I shouldn't do this? Am I likely to run into severe signal loss?
  Reply With Quote
Old 28th May 2014, 05:46 PM   #2
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
NAY !!
50 foot RCA interconnects are problematic under the best of conditions, no chance for speaker cable to work as an RCA interconnect.

BUT you can convert it to balanced audio using a balun transformer then use the speaker wire as a Unshielded Twisted Pair (UTP) then another balun transformer to get it back to RCA.

Let me look for a link.
__________________
Kevin
  Reply With Quote
Old 29th May 2014, 05:42 PM   #3
diyAudio Member
 
Join Date: Dec 2013
not sure i understand. an rca cable is simply a connector with 2 wires. Main problem of rca is that the gauge is so small resistance would be really high and signal loss over distance etc. people use rg6 to make long rca runs all the time b/c of the shielding. So i don't get why shielded 16 gauge speaker wire wouldn't work. it's not be ideal for pro audio, but then again my sub is fairly basic. Prob retailed for $300-$500 tops when brand new. So better question is, will there really be an audible difference?
  Reply With Quote
Old 29th May 2014, 06:03 PM   #4
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Your first post said standard speaker wire, which would most likely be read as untwisted, unshielded, parallel "lamp cord"

I've personally made unshielded RCA interconnects as long as about 15ft, but that's been with 90dg diagonal braided #24 not parallel #16 conductors.

There's nothing wrong with a good kludge, but if it's at all possible to pull new cabling in the wall, I'd switch it over to a single unspliced run of shielded mike cable, RG6 Coax or whatever.
__________________
now on sabbatical
  Reply With Quote
Old 29th May 2014, 06:45 PM   #5
AuroraB is offline AuroraB  Norway
diyAudio Member
 
AuroraB's Avatar
 
Join Date: May 2001
Location: Norway, -north of the moral circle..
Assuming you're talking about a powered sub, there's no reason as such not to do it. The input impedance of the sub is probably 10kohms+, so the signal loss you're referring to is totally negligible....... even if it's twisted or braided in this or that fashion...
If you out to buy some cable, I'd absolutely second the idea of some good shielded mic cable, probably less tha 1$/ft..... more expensive only feeds your or other peoples beliefs... :-)
__________________
While the Lie leapt from Bagdad to Constantinopel, the Truth was still looking for it's sandals!
  Reply With Quote
Old 29th May 2014, 06:55 PM   #6
diyAudio Member
 
Join Date: Mar 2007
Location: California
A non-coaxial, non-twisted, non-shielded straight run of "lamp cord" type wire 50' long will not have very good noise immunity. If your goal is to build a mini-antenna to pick up your mains frequency then it will work for that purpose.
__________________
"Hardware eventually fails. Software eventually works" - Michael Hartung
  Reply With Quote
Old 29th May 2014, 06:58 PM   #7
Budgie is offline Budgie  United States
diyAudio Member
 
Join Date: Jan 2003
Location: Not were I'm suppose to be......
It will work with only one possible problem in that the wire might pick up interference (noise, radio signals etc.). No damage will occur from it.
  Reply With Quote
Old 30th May 2014, 04:06 PM   #8
diyAudio Member
 
Join Date: Dec 2013
ok, so given there may be some interference, how would you test it's effect and what should I listen for? If I find it noticeable I can always try running rg6 for the subs down the road though the conduit is getting cramped....

Here's what the run looks like (the conduit is existing in dry wall ceiling and can't be changed since joists run perpendicular): I've got 2 pvc conduits running parallel about 8" apart. 1 has ac power running through it, the other has phone/cable line. We don't use home phone, and the cable run connects half the house's outlets even though we don't use any of them. Our cable service is internet only. There are also 2 lamp chord style runs of unshielded speaker wire about 1-2' away but not in any conduit. The house wiring including basement seems to be mostly in grounded metal conduit (except this ceiling pvc conduit). In the cable/phone conduit I have added a 4 conductor shielded 16# speaker wire, another unshielded lamp chord speaker wire, stp cat6 for internet, 3.5mm for IR extender. From these runs, I need to power my front 2 channels (altec 605s), center channel, and 1 powered sub for future upgrade (the center/sub are jamo, and nothing special). BTW this is in a dedicated theater room that might get 15% music listening (mostly classical). given that i'd prefer to avoid buying anything else right now and I have lots of unshielded 16#/2 speaker cable lamp wire and a limited supply of 16#/4 shielded speaker cable (might be able to eek out enough for 1 more run down the conduit, but it will be close considering the other runs i need), what would you guys do?
  Reply With Quote
Old 31st May 2014, 12:35 AM   #9
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
What should you listen for interference wise? It's hard to say some is 24 by 7 continuous background noise, some is continuous background noise for minutes or hours some is random pops & noises.

Don't use the kind of RG6 coax that the cable TV company installs (RG6-Quad Shield) it's for TV station frequencies.
__________________
Kevin
  Reply With Quote
Old 31st May 2014, 12:59 AM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

I'd use RG6, rather than speaker cable. It will be fine.

rgds, sreten.

RG59 makes great audio inter connects, I wired
up a complete studio with loads of the stuff.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 31st May 2014 at 01:06 AM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bracing overkill yay or nay ? DIFORCE Multi-Way 301 28th February 2013 09:53 PM
Screws in Cabinets: Yay or Nay? gassit Full Range 22 18th February 2013 07:45 PM
Mounting heatsinks upwards,, yay or nay? OllBoll Solid State 5 1st December 2010 12:45 AM
Copper/Aluminum heatsink - yay or nay? thylantyr Solid State 36 2nd July 2004 12:11 AM
Cathode Follower? Yay or nay? SHiFTY Tubes / Valves 25 16th March 2004 07:38 AM


New To Site? Need Help?

All times are GMT. The time now is 06:42 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2