How do you hook up 2 rear centers?

Discussion in 'Speakers' started by Tom Kay, Jan 27, 2004.

  1. Tom Kay

    Tom Kay Stunt Coordinator

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    Hello All;

    I am building my HT, and will be pre-wiring all of my cables and speaker runs before I close up the walls and ceilings with drywall.

    I have heard that using 2 rear center speakers is better because the sound is "injected" a little more directly into your ears than with 1 rear speaker blasting at the back of your head.

    Please assume that I am talking about an amp that has only one output for a rear center, and I want to use 2 speakers. If it has 2 outputs, then it's kind of a non-issue, as they'd be set up for the right resisitance. Would the one-speaker setup be called 6.1, and the 2 rear speaker setup be called 7.1?

    So here's my question: how do you hook this up? If you wire 2 speakers in parallel (assuming they're 8 ohms each), you'll have 4 ohms of resistance. Isn't that bad for most AVR's? I mean, aren't the amp outputs performing best with an 8 ohm load, and at risk of over-working if they see only a 4 ohm load? Will the 2 center speakers appear louder or quieter than the other speakers in the system?

    So how is it done? Thanks, Tom, Ottawa Canada.
     
  2. Steve Griswold

    Steve Griswold Stunt Coordinator

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    At one point I had 4 Rogers DB-101 studio monitors (4 Ohm) running on my Onkyo TX-SR600 with 2 more wired in serial as a center channel (8 ohm load). There were no ill effects during either extended normal listening or 2-3 hour movie watching.

    However, depending on how hard you drive your system and your amplifier/receiver's tolerances it could cause it to overheat. I would think that in most cases, however, that it simply activates a thermal shutdown circuit as opposed to melting down the electronics. [​IMG]

    COnsidering that you are only wiring the 2 rear center channels in parallel (i.e., 1 4 ohm load) and given that the rear center doesn't get THAT much signal fed to it at any given time, you should probably be fine.
     
  3. John S

    John S Producer

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    Putting dual 8 ohm spekaers in parallel for your back off of one channel/amp in your AVR will most likely cause no problems. Makes a fairly effective 7.1 even. I like the idea.
     
  4. Chad A

    Chad A Stunt Coordinator

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    I wired mine in series for my back speakers and I'll recommend you do the same.
    I'd much rather have a 12ohm load than a 3ohm (my speakers are all 6 ohms) load no matter how much use they're getting.
     

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