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Yamaha MSR 400

Discussion in 'Sound, Music, and Intercom' started by iancl, Apr 22, 2007.

  1. iancl

    iancl Member

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    Looking into Yamaha MSR400's, and noticed in the specs, that really, they run at 225+75 = 300 W

    They state that the power consumption of the amplifier is 110W though.

    Does anyone know what this means? I was fairly certain that the speaker would be 300/400 (whichever) watts RMS, and I hope Yamaha haven't gone back to peak power ratings. So does that mean that the power consumption is a resting/standby/idle rating? If so, why wouldn't they quote a maximum power consumption?
     
  2. stantonsound

    stantonsound Active Member

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    The power consumption refers to how much electricity the amplifier requires to provide the sound output. If that is correct, 110Watts, that means that it requires about 1 amp of current to work.

    1000watts= 1000 volts * amps (1kw=1kva)


    110 watts
    ----------- = amps
    120 volts


    .916 amps
     
  3. iancl

    iancl Member

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    Yeah, yeah, I know what it means electrically (although in Aus we're at 240v), but how can it have a consumption of 110W and an output of 300W.

    Either the output isn't in RMS, or the consumption is at idle.

    Anyone know?
     
  4. stantonsound

    stantonsound Active Member

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    Sorry, didn't mean to insult you.

    I run 5 QSC PLX amplifiers, a (2) 3402, (2) 3002, and a 1602. These power my Clair Brothers rig, and all amps are pushed hard and turned all the way up.

    All together this is well more than 15,000 watts and I can power them all on a standard 20amp outlet. Although I usually split the amps on two circuits, it is no problem to have them on one circuit.

    There is a correlation between the watts required and the output watts, but it is different for each manufacturer and model.
     
  5. iancl

    iancl Member

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    No worries, it was just the early hours or the morning getting to me. :p

    So you're saying that your speakers are putting out 15,000W, and consuming only 2,400W?
     
  6. audioslavematt

    audioslavematt Active Member

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    A general rule of thumb is you'll be consuming about an eighth as much power as stated in the manual. Those power consumption numbers are derived from a pure sine wave signal driven to clip. Music is far from a pure sine wave and has its peaks. It's important to make sure there is enough power for those peaks, if only for a short period of time. As long as you're not running stupid levels, it's easy to run a system like Stantonsound's off a single 20 amp circuit.
     

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