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Running my cabs bridged?

Discussion in 'Amps and Cabs [BG]' started by jasonbraatz, Oct 1, 2001.


  1. jasonbraatz

    jasonbraatz

    Oct 18, 2000
    Oakland, CA
    ok, i have a DCM1000 and two 4 ohm cabinets. running stereo only puts out 350/channel, which, granted, is alot, but if i can be running 500 watts per speaker by running my amp mono-bridged, i'd like to.


    so, i'm using speakons, and none of my cabinets have speakon outs, just ins.


    how can i work this?



    jason
     
  2. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    Sorry man, you just cant run your DCM1000 with (2) 4Ohm Cabs in Bridged Mono.

    That would mean that:
    2 x 4Ohm Cabs in Parallel will give you a total load of 2 Ohms. Wich is LOWER than your DCM´s minimum load in Bridged Mono Mode.

    That translates into just 1 ohm per channel. That would put the DCM in protect mode or fry it.
    It could even work for a very little time, but it will definetly shut down by heat.


    The best you can do right now is to keep it stereo.
    1 cab per channel.
     
  3. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    Btw, the Inputs on your Cabinets would also work as outputs.

    If you wanna try.. (Tell me what happens!!) You can put a Speakon in the Bridge Out on the DCM to the First Cab Input.
    Then from that cab´s other Input, one Speakon to the Other Cab.

    If you fry it, dont tell Carvin I told you how to.

    :D
     
  4. MMmmm is that what they call daisy chaining? I have wondered about this.

    My (now ex-!!) 1 x 15 had two jack input sockets so that it could be 'daisy chained' but I was never sure how this affected the total impedance - does it effectively put it in series with it? ( normally it's in parallel when it's plugged in to the back of your amp isn't it?)
     
  5. mgood

    mgood

    Sep 29, 2001
    Levelland, Texas
    Yes, that's daisy chaining. But no, most cabs I've seen when daisy chained together arre still in parallel.
     
  6. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    Bassbarbie, that would put it in parallel with another cab.

    Our mind tells us that Daisy Chaining is "Series" because you see one after the other, but actually it is parallel.

    Series consists of Positive to Negative to Positive to negative, etc etc etc.

    And Parallel means Positive to Positive and Negative to negative respectively.

    About the Impedances.
    It is
    Parallel
    Being X and Y , the impedances of each loudspeaker.

    1 / (1/x +1/y + ...) = R
     
  7. Thanks for that. So it's pretty much always in parallel then!! Mind you, now my cabs dead it won't make any difference, but it's nice to know! :)

    I do understand about series and parallel connections, it just that looking at the sockets you can't tell what's going on inside...... I suppose if I were a boy I'd have taken it apart to look!
     
  8. Correct me if I'm wrong; this might be wrong.


    4+4 in parallel does equal 2, but 4+4 in series =8. If you can somehow run the two cabs off of the same jack via a splitter, you'd get 8 ohms.

    Only problem is it's not exactly 1000w, but it could work!
     
  9. Luis Fabara

    Luis Fabara

    Aug 13, 2000
    Ecuador (South America)
    Audio Pro - Ecuador
    Speaker cabs wired in series sound like ·$%"·$%&
     
  10. <b>Davy0 said...</b>


    Correct me if I'm wrong; this might be wrong.

    4+4 in parallel does equal 2, but 4+4 in series =8. If you can somehow run the two cabs off of the same jack via a splitter, you'd get 8 ohms.


    <hr>

    I'm afraid I'm gonna have to correct you - sorry about that ;)

    Using a splitter is the same as wiring two cabinets in parallel. Two 4 ohm cabs off a splitter = 2 ohms.

    cheers,

    allan
     
  11. Wow! Can't say I've ever seen or heard a splitter!... We have log splitters here... but I guess they're pretty different! :D

    Now, I've just got these Eden cabs on approval. I can either plug them in using the usual jack socket, or there is a positive and negative input on each one. I have no gumpf on these speakers (that's reading matter - instructions!), but maybe these could be used to connect the two in series??

    Personally I have no inclination to do this, but would this then effectively make them the same as a 16 ohm cab?

    Actually this wouldn't work would it, because I'm still using the output from the amp via the usual jack socket which will be carrying both the positive and negative leads.

    Mmmm!..... is anybody still with me - its the early hours of the morning here, and my brain may be fuddled.