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Amplifier Power

Discussion in 'Amp Tech Center' started by Jon Snell, Nov 28, 2020.

  1. Jon Snell

    Jon Snell Tele-Holic

    Aug 31, 2015
    Jurassic Coast. UK.
    I have just come across this sentence on another blog I write for and thought it will make a few people laugh as it did me. It is a classic :lol:.

    How to list the power output of an amplifier.

    "It’s fairly straightforward.
    The mains power (240V at up to 10A, or 2400W max hereabouts) is fed through a transformer with around 85% efficiency, giving us say 2100W max, then rectified and filtered, then fed through a class A-B power amp with maybe 60% efficiency, giving us say 1200W max from a mains plug.

    Finally they feed the power through a complex marketing bullish!t network, and put 4kW out to the speaker.
    Funny enough, the whole mess only weighs a couple of kilos, so it must be terribly clever".

    Thanks to RayLi for this gem.
  2. VintageSG

    VintageSG Friend of Leo's Ad Free Member

    Mar 31, 2016
    Hampliflier power is measures in PMPO ( spullink deliberut )
    PMPO is a spurious grouping of capital letters. Some, mistakenly, believe it stands for 'Peak Music Power Output'. This alone is a nebulous term, open to interpretation and swift back-pedalling when questioned regarding the relationship between sustained output at tolerable levels of clipping and the price of cloud paint at the sky-hook shop.
    PMPO is actually the initial letters of the thoughts of the specification copywriter as they mashed the figures into the document. 'Perhaps My Partner Ovulated' This ties in with the response of anyone reading said spec sheet...' Get fecked!'
    2L man and Jon Snell like this.
  3. Abu Twangy

    Abu Twangy Friend of Leo's

    Mar 16, 2012
    The old Mike Matthews Freedom Amp of the early 1970s was rated at 300 watts which I suspect was PMPO. The cheap all-in-one stereos of the same era such as Electrobrand often were rated PMP or Music Power. Another nearly imaginary number was IPP or instantaneous peak power, a rating that made a modest club amp appear capable of playing a stadium gig

    These measurements were the electronic equivalent of dropping a Ford Pinto from an airplane at 10,000 ft to estimate its top speed.
    BobbyZ and Jon Snell like this.
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