Onkyo 797 - Two speakers on one terminal?

Discussion in 'Archived Threads 2001-2004' started by Willem Vos, Nov 7, 2001.

  1. Willem Vos

    Willem Vos Stunt Coordinator

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    Hi, I was just wondering if it would be possible to connect two speakers on one rear-back terminal (as the onkyo only has a single rear center)
    Would it just divide the power and the ohmage between the speakers?
     
  2. Mike LS

    Mike LS Supporting Actor

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    You don't want to do this! It would basically divide the wattage, but the impedance would fall WAY below what the receiver is capable of handling.
    Granted, running at low levels, you may never have a problem with it, but there's a good chance you would. It's extremely easy to overload a receiver adding speakers that aren't allowed for.
    If you're just wanting to have 2 rear center channels, that's easy enough to do by wiring the spekaers in series. What you'll need to do is come off of the receiver from the positive terminal and run that single wire to the positive terminal of the closest speaker. The run a wire from the negative terminal of that first speaker to the positive terminal of the second speaker. The run a wire from the negative terminal of the second speaker back to the netagive terminal of the receiver. This will correctly divide the power and actually raise the impedance instead of lowering it. You can safely run 2 speakers off of one terminal that way.
    The sound you get may not be quite up to your liking though. Sometimes this diminshes the sound to an extent. But for an EX channel, it'd probably be fine. Give it a try and see what you think.
     
  3. Willem Vos

    Willem Vos Stunt Coordinator

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    Thanks Mike,
    I don't have the 797 myself, but I was thinking of getting one. I do have 7 speakers though, and naturally I want to use them all.
    The 898 has 7 channel amplification, but it's a big step up costwise from the 797... - I'm guessing that most of that cost is in the remote [​IMG]
    [Edited last by Willem Vos on November 07, 2001 at 08:26 AM]
     
  4. Gerard Martin

    Gerard Martin Second Unit

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    Onkyo suggests for the 787 an
    additional 2 channel amp be used
    to achieve 7.1
    ------------------
    Jerry
     
  5. Seth T

    Seth T Stunt Coordinator

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    I get my 797 on Saturday...my dealer friend called today to tell me it came in. Wooo! [​IMG]
    I also have two extra speakers, one of which is obviously going for the rear center. Unfortunately, that's all the room on that wall I have, until I move into a house. At that point, I'll probably get an http://www.onkyousa.com/show_model.cfm?class=poweramp&m=M-282
    -Seth
     
  6. Thomas_Berg

    Thomas_Berg Screenwriter

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  7. Zane Johnson

    Zane Johnson Agent

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    wiring in parallel halfs the total impedance, hence doubling the power output of the amplifier..
    series adds the two impedances together.....hence lessening the power output..
    amplifier output is based on electrical resistance...
    the lower the resistance the more power that is gonna flow through the circuit...
    say the amp puts out 100 watts @ 8 ohms..
    drop two 8 ohm speakers in parallel and the amp is now putting out 200 watts.... 100 watts to each 8ohm (4ohm total) resistance.....there are two, so it's doing 200 watts total..
    but..drop two 8 ohm speakers in parallel and you get a 16ohm total impedance... the amp puts out 50 watts total.. 25 to each speaker.....this is much safer...
    series wiring...
    amplifier channel on reciever
    + -
    |
    |
    |
    + --- + - back to amp negative terminal
    speaker 1 speaker 2
    parallel wiring...
    amplifier channel..
    + -
    | |
    | |
    + - speaker 1
    | |
    | |
    | |
    | |
    + - spaker 2
    [Edited last by Zane Johnson on November 08, 2001 at 12:06 AM]
    [Edited last by Zane Johnson on November 08, 2001 at 12:08 AM]
     
  8. Vietor

    Vietor Stunt Coordinator

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