Power Rating: Matching amp with speakers (and does a sub affect the equation?)

Discussion in 'Recording/Live Sound' started by The Smith, Feb 19, 2015.

  1. The Smith

    The Smith Supporting Member

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    I think my speakers may be under-powered.

    I have a pair of Mackie c300z rated at 300W RMS at 8 ohm.

    My power amp, a Mackie M1400i, has a stated
    "Continuous
    Sine Wave Average Output Power" of 250 watts per channel into 8 ohms.

    Isn't it true that an amp should have 50% more power than the speakers?

    So, am I underpowered?

    BUT... does it have any bearing on the matter that I send my signal to two subs first, and then high-pass the remaining signal (100 Hz and above) to the amp?

    Thanks!

    BTW, this setup is for DJing.















     
  2. loudboy

    loudboy Member

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    Passive subs, w/a passive crossover built in and then out to the Mackies?

    I'd say you were probably underpowering them.
     
  3. The Smith

    The Smith Supporting Member

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    ^No, the subs are active.
     
  4. GCDEF

    GCDEF Supporting Member

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    There is no such thing as underpowering speakers. The concept is nonsense. Anybody who tells you otherwise is confused.

    That amp will be fine, although if you really want to get the most out of your speakers, you may want to go a bit larger.
     
  5. westex

    westex Disgruntled Optimist Silver Supporting Member

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    +1. If it is loud enough for your purposes it is fine, however the speakers will handle more power than what that amp is capable of. There is no danger of damaging anything by running these speakers with this amp but if they are not loud enough and you try and drive your amp too hard you could drive the amp into clipping and thus sound distorted and be hard on the amp.
     
  6. The Smith

    The Smith Supporting Member

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    This has never happened, yet. And I run the system pretty loud.



     
  7. walterw

    walterw Gold Supporting Member

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    it's more like the amp could have 50% more power than the speakers if you wanted to squeeze every drop of volume you can safely get out of the speakers.

    if you're loud enough now and you're not clipping the amp you have, then you have enough power.

    (i will say i find bigger amps to sound better though, even if the system is not run any louder; more headroom seems to come across as an overall cleaner sound, even if you weren't hitting the clip lights before.)
     

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