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Thread: I'm just a primary school teacher and I need help :(

  1. #81
    Join Date: Dec 2008

    Location: London, UK

    Posts: 37

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    Sound systems would wire in series and the amps would generally double the wattage.

    So for a well designed amp rated at 100w amp at 8 ohm's output connected to a pair of 8 ohm speakers connected in series to another pair would halve the impedance down to 4 ohm's and throw out 200w.

    Wired in series these four 8 ohm speakers would present a load of 16 ohm's to the amp so it would throw out 50w.

    A Krell KSA-80 would throw out 80w in to an 8 ohm load, 160w in to a 4 ohm load, 320w in to a 2 ohm load and if you are really insane 640w in to a 1 ohm load!

    It does however weigh about 45kg and the Extinction Rebellion crew would be chasing you if you ran it below 4 ohm's. It could all be done with Class AB amps that weigh a lot less.

    I think that made sense......
    Last edited by shahsy; 08-10-2019 at 23:48.

  2. #82
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,403
    I'm Chris.

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    Quote Originally Posted by shahsy View Post
    Sound systems would wire in series and the amps would generally double the wattage.

    So for a well designed amp rated at 100w amp at 8 ohm's output connected to a pair of 8 ohm speakers connected in series to another pair would halve the impedance down to 4 ohm's and throw out 200w.

    Wired in series these four 8 ohm speakers would present a load of 16 ohm's to the amp so it would throw out 50w.

    I think that made sense......
    Er... No
    Speakers in series the impedance adds, speakers in parallel impedance halves
    Solid State voltage amplifiers exhibit difference of power delivery vs valve , and you are forgetting current as an essential part of the wattage equation

  3. #83
    Join Date: Dec 2008

    Location: London, UK

    Posts: 37

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    Spot on Chris, I have them the wrong way around. You are correct!

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