Speaker Wiring: Series Vs Parallel

Discussion in 'Cabinets & Speakers' started by Gianni, Mar 15, 2017.

  1. Gianni

    Gianni Well-Known Member

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    You are plugged into a 2x12 cab, at gig volume, and for some reason one speaker fails:

    If the cab has two 8-Ohm speakers wired in series for a 16-Ohm load, the show is over, as the whole cab goes silent, while your tube amp no longer sees a load, or rather sees an infinite impedance load.

    Nevertheless, the show may not be over for your amp too, as hearing no sound will prompt you to power it off so as to investigate the problem. How long do you really have, though, before flyback voltage fries the output transformer?

    If the cab has two 16-Ohm speakers wired in parallel for an 8-Ohm load, the show will go on, as one speaker will still be working, and you playing, while the amp still has a load on it.

    Still expecting to see an 8-Ohm load, however, your amp will now see the 16-Ohm one of the remaining speaker, while, although it will now put out less power, it may still be quite some time before you realize that you are actually playing through just one speaker, so as to do something about it. Am I right to assume that the output transformer is more likely to survive the increased impedance load, double in this case, much longer than no load at all?
     
    Last edited: Mar 16, 2017
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  2. mickeydg5

    mickeydg5 Well-Known Member

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    Parallel is safer. Loosing a speaker would double the impedance and half the load of the cabinet. It is not an ideal condition but is useable especially for a limited time.

    On the other hand an open circuit or no load condition is not good, not good at all especially with a tube amplifier.
     
    Last edited: Mar 15, 2017
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  3. tone seaker

    tone seaker Well-Known Member

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    i posted that response some where and it disapered. Been looking for the topic for several days :(
     
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  4. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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  5. Gianni

    Gianni Well-Known Member

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    Thanks a lot, mate! :yesway: That’s what I thought too, but needed confirmation from someone who, unlike me, knows what he’s talking about. ;)
     
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  6. mickeydg5

    mickeydg5 Well-Known Member

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    I do not know what I am talking about.

    Read my signature.

    Just think if I were to build amplifiers. They would not only have cup holders but would include stadium seating with beer dispensaries.
     
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  7. Gianni

    Gianni Well-Known Member

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    Thank you, mate! :yesway: I did actually read your response in that thread at the time, but wanted to find out how much safer parallel wiring would in fact be in the case of one speaker failing.
     
  8. Gianni

    Gianni Well-Known Member

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    I already have, but your posts suggest otherwise. ;)
     
  9. mickeydg5

    mickeydg5 Well-Known Member

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    It never hurts to double check. :thumb:

    Wait, are we talking about amplifier and cabinet modifications or cup holders? :D
     
  10. Gianni

    Gianni Well-Known Member

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