Mixer / speaker compatibility question

Discussion in 'Recording/Live Sound' started by buzzp, Jul 10, 2019.

  1. buzzp

    buzzp Member

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    If I have a powered mixed (mackie 808m) that delivers 1200 watts and a pair of passive monitors hat are rated for 500 watts and 1000 peak, how does that work? Is the 1200 split across both?
     
  2. sants

    sants Member

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    The 1200 watt rating is at 2ohm load and 600 watts split across two channels.

    1200 watts @ 2ohms = 600 + 600
    900 watts @ 4ohms = 450 + 450
    600 watts @ 8ohms = 300 + 300

    These are peak power ratings so expect constant to be 50-60% of that.

    Assuming your speakers are 8ohms you are getting 300 watts peak of run on each output channel of the pa head.

    If you run the pa as one side powering mains and the other monitors, assuming 8ohm speakers all around it will look something like this.


    Mains 8ohm + 8ohm in parallel (daisy chained) = 4ohm

    Max at 4ohms of 450 watts/ 2 speakers = 225 watts per speaker.

    The same holds true for the monitor side.

    To answer your question in simple terms though yes, the power would be split amongst your speakers. I.e. 1000 watts/2 speakers = 500 watts per speaker.
     
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  3. buzzp

    buzzp Member

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    Awesome, thank you so much man! Another question because I’m pretty new to this piece of sound. If my mixer is 2 ohms and the speakers are 8 ohms, is that an issue?
     
  4. sants

    sants Member

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    No. Your mixer per spec is able to run 2, 4, or 8 ohms.

    A 2 ohm load will make your amp work harder but it according to specs it will run it.
     
  5. buzzp

    buzzp Member

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    Got it thanks. So you would feel OK running the mackie 808m 2 ohm mixer into a pair of 8ohn speakers?
     
  6. Elantric

    Elantric Silver Supporting Member

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    a pair of the 8 ohm mackie speakers will appear as 4ohms to a mono 900 watts power amp
     
    Last edited: Jul 11, 2019
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  7. sants

    sants Member

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    Yes. The amp is made to handle different loads.
     
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  8. sants

    sants Member

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    Total amp power using two channels is 900 watts at 4ohms. That’s with both sides of the power amp receiving a 4ohm load. 450 watts per side.

    Each 8ohm speaker would see about 225 watts if running off one side of the amp if they are daisy chained. 8 + 8 in parallel with give you 4 ohms.

    To send 450 watts per speaker you’d need a single 4 ohm speaker per channel. You could also do a pair of 8 ohm speakers per side for a 4 ohm load. Same as above. 450 watts/ 2 speakers = 225 watts per speaker.

    In most of these setups, mains are usually daisy chained for total load of 4 ohms on one channel and two monitors are chained on the other side for a 4 ohm load.
     
    Last edited: Jul 11, 2019
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