40 ft subwoofer cable

Discussion in 'Speakers' started by Ronneil Camara, Sep 26, 2004.

  1. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Hey guys. Just would like to know if there are known issues when running a 40 ft long subwoofer cable? And also, since I will build it myself, I will be using this to convert my F-connector to RCA audio.

    http://www.radioshack.com/product.as...5Fid=278%2D290

    Any comments will be greatly appreciated.

    Thanks.

    Neil
     
  2. james_pierce

    james_pierce Extra

    Joined:
    Apr 7, 2004
    Messages:
    24
    Likes Received:
    0
    For some reason it is not letting me post url's. Anyways you can do a search on the HSU Research forum and Sasha from HSU has some good recommendations on builing your own cables. I read on a post there where he recommended using 3 of their 20 ft cables using female to female adapters to connect them . So it seems it should not be a problem to run 40 ft of cable.
     
  3. ScottCHI

    ScottCHI Screenwriter

    Joined:
    Feb 21, 2004
    Messages:
    1,292
    Likes Received:
    0
    good coax and you'll be fine. the adapters work well, too.
     
  4. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    What I have here now is RG-6 cables, and it's 16 AWG printed on the wire. I investigated the cable and it's just weird because, I am only seeing 1 strand of wire outside the white housing for the thicker wire but fully covered with foil. I'm sure that foil is a conductor. Is the outer wire really important for my requirement?

    Thanks guys....
     
  5. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    I finished building the 40 ft cable using the 279-290 F-connector from RadioShack and it worked like a charm. [​IMG]
     
  6. Wayne A. Pflughaupt

    Joined:
    Aug 5, 1999
    Messages:
    6,061
    Likes Received:
    25
    Location:
    Katy, TX
    Real Name:
    Wayne
    Cool. I would have used the cheaper nickel-plated adapters, but glad to see you got it working. There are better grades of RG-6 that have copper braided shielding in addition to the foil, but for this application what you have will work fine (as I’m sure you’ve already seen).

    Regards,
    Wayne A. Pflughaupt
     
  7. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Hey, you know what, I found out last night that the cable I built was producing a humming sound. [​IMG] I was actually moving my SVS to the corner and noticed that hum. I connected back my old cable and there was none.

    I don't know why. It could be multiple translations.

    F-connector-2-RCA
    F-connector-2-RCA

    Looks like I'll just have to buy a branded cable.
     
  8. JustinG

    JustinG Stunt Coordinator

    Joined:
    May 21, 2003
    Messages:
    114
    Likes Received:
    0
    my sub cabling is like this:

    RCA from rcvr to wallplate (rca to F adapter)
    probably 30-40 ft of rg6 inwall to the other plate with the same adapters.
    RCA from wall to sub.

    I get no hum at all. Re-check your connections and make sure they are all tight/secure. Maybe you didn't cut the shielding back or something.
     
  9. Matthew Todd

    Matthew Todd Second Unit

    Joined:
    Jan 3, 2000
    Messages:
    338
    Likes Received:
    0
    Neil, if you're going to buy a branded cable, you might want to check out bluejeanscable. You'll find their banner at the top of the speakers&subwoofers forum page. There pricing is very nice too.

    Matt
     
  10. John Garcia

    John Garcia Executive Producer

    Joined:
    Jun 24, 1999
    Messages:
    11,571
    Likes Received:
    24
    Location:
    NorCal
    Real Name:
    John
    The connectors should not cause hum. It's a cable problem. I've used those F to RCA connectors in this type of installation before with no problem.
     
  11. Wayne A. Pflughaupt

    Joined:
    Aug 5, 1999
    Messages:
    6,061
    Likes Received:
    25
    Location:
    Katy, TX
    Real Name:
    Wayne
    Like Justin said, re-check your terminations, especially since you made the cable yourself. More oft than not, the problem with coaxial cable is improperly terminated F connectors. If you don’t have the specialty tools required to properly install F connectors, you’d be better off buying an off-the-shelf pre-made cable.

    Regards,
    Wayne A. Pflughaupt
     
  12. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    I have a crimping tool which I bought at RadioShack.

    John Garcia might be correct. It might be the cable. [​IMG]

    ----- blue foil w/ single strand wire
    --------+ /
    | /
    +--------+
    | +----------
    +--------+ |
    | | |
    ------------+ | |
    | | |
    | | |
    | | +-- copper
    | |
    | +-------- white insulator
    |
    |
    +------------------- external black cover


    Am I correct that the blue foil should touch the inner circle on the F-connector? Is the blue foil connection really needed for subwoofer connection?

    I will recrimp it again tonight but I am going to use the weather proof F-connectors, [​IMG]
     
  13. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Sorry guys, I don't know if it's possible to attached a jpeg or gif image. There is no way for me now to attach a public URL. Here it is again....

    +---------- black outside cover
    | +----- white insulator
    --+--+ |
    +--+
    | +----
    +--+ |
    ------+ +-- center copper

    ----- blue foil inside
    black cover but
    outside white insulation
     
  14. Pete_M3

    Pete_M3 Agent

    Joined:
    Mar 18, 2004
    Messages:
    32
    Likes Received:
    0
    bluejeanscable.com has your answer, 3 finished subwoofer cables to choose from, from $30 to $55 for 40 feet, and an isolation transformer if the cable doesn't get rid of the hum.

    I've never built a cable, so I can't help you there.
     
  15. Ronneil Camara

    Ronneil Camara Stunt Coordinator

    Joined:
    Dec 2, 2002
    Messages:
    235
    Likes Received:
    0
    Ok guys, I did some experiment on different RG-6 cables available in my house. IIRC, I tested 6 different cable brands(white and black). I still used the same 279-290 F-connector to RCA from RadioShack.

    What I found out was that, an RG-6 cable that uses foil instead of braided wire causes humming sound. The other 3 cables that employ braided wire didn't produce any hum at all. Oh by the way, for the RG-6 that uses foil technology, you can here the hum at most in 3 ft. I also tested the cable I bought at Bestbuy 5 months back. It is an Acoustic Research 15ft subwoofer cable. There is also a hum but very unnoticeable. I had to place my ear near the bottom part of my 20-39PCi subwoofer. But again, using coax RG-6 that uses braided wire, even if I placed my ear very close to the foot of my subwoofer, there was none.

    So I guess, this can serve as a warning for some people who wants to build their own cable.

    Bottomline, it might be cheaper going with the bluejeans route. But also, I haven't check an RG-6 braided wire price yet.

    Just my 2cents...

    Neil
     
  16. Scott*Ellis

    Scott*Ellis Auditioning

    Joined:
    Jan 3, 2005
    Messages:
    3
    Likes Received:
    0
    Hey... thanks to everyone that contributes to this forum. I have never posted but I always find what I need just by reading.

    This post is just what I needed, I am about to install my first Sub and I am trying to get set up with cable etc. I have pre-run (during construction) some nice RG6 with braided shielding, my question now is what kind of connectors do I need and where should I get them? In the end I just need RCA connections I guess but where do I get them to go on RG6 and what tools do I need.

    thanks again.
    Scott
     
  17. Wayne A. Pflughaupt

    Joined:
    Aug 5, 1999
    Messages:
    6,061
    Likes Received:
    25
    Location:
    Katy, TX
    Real Name:
    Wayne
    An easy no-tools solution is to use some twist-on F-connectors. They’re pricey compared to the kind you crimp on, and seem to get no respect, but I’ve had good luck with them. Then you can use some F-to-RCA adapters to connect to the audio gear.

    Regards,
    Wayne A. Pflughaupt
     

Share This Page