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Reload Thread: Underrated, overrated... How do you know?

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    Underrated, overrated... How do you know?

    Just wondering how do you measure the true RMS of an amp yourself.

    Cheers
    Anders







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    Re: Underrated, overrated... How do you know?

    You don't, without a lot of expensive test equipment that most people don't have access to.

    If you really want to know, pay a competent shop to bench test it for you.




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    Re: Underrated, overrated... How do you know?

    Quote Originally Posted by squeak9798
    You don't, without a lot of expensive test equipment that most people don't have access to.

    If you really want to know, pay a competent shop to bench test it for you.
    it beats guessing




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    Re: Underrated, overrated... How do you know?

    I normally guess,,, any thing from walmart is definatly UNder rated I would give any walmart brand +300 watts rms




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    Re: Underrated, overrated... How do you know?

    Most reputable car audio manufactures are underrated, most lesser known brands are overrated...so if you see an 2000 watt amp for $149, you can almost guess.



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    Re: Underrated, overrated... How do you know?

    Kickers WAYYYY overrated, just put it that way....

    Lol j/p from what I hear and have seen Kickers underrated




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    Re: Underrated, overrated... How do you know?

    *TRUE RMS* clamp meter
    DMM
    Load (speaker/resistor)
    Amplifier
    Power Supply
    teh mathematics




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    Re: Underrated, overrated... How do you know?

    So I can see why companies would overrate a product, but why under rate

    Is it because of inadequate testing equipment or is there some other explanation that actually makes sense?




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    Re: Underrated, overrated... How do you know?

    Well...
    If they underrate then they have a bottom RMS that the amps can be
    So if its 1300W instead of 1200 then they have lee way.
    I dunno..im wee turded




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    Re: Underrated, overrated... How do you know?

    it's always best to be underrated, if you say amp can do XXXX power into X ohm load at XX.X volts, it better do that, and more for the consumer...or, it should.



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    Re: Underrated, overrated... How do you know?

    Quote Originally Posted by Polecat
    it's always best to be underrated, if you say amp can do XXXX power into X ohm load at XX.X volts, it better do that, and more for the consumer...or, it should.
    ah, ok. That makes sense now




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    Re: Underrated, overrated... How do you know?

    Some of it is marketing. Like those older Pioneer PRS amps; IMHO those were underrated by so much on purpose simply so people would drool over them when they looked at the birthsheet compared to the "rated" power. I'm sorry, but you can't "over-engineer" something on accident by so much that every model makes more than double it's "rated" power. They knew going into it that the rated power was severely under what the amps were capable of. And look at what happened, everybody is always like "Man, those amps are awesome because they are soooo underrated!!"




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    Re: Underrated, overrated... How do you know?

    Take a DMM (digital multimeter)
    set it to AC voltage, with the appropriate sensitivity
    hold test leads to the +, - of the channel being tested
    blast tone or music at maximum unclipped level
    record highest voltage displayed
    multiply voltage by itself then divide by resistance of speaker connected to channel.

    for example-
    34 volts peak is recorded, channel is connected to a 2 ohm speaker/load
    peak volts squared
    34X34=1156

    divided by resistance
    1156 / 2= 578 watts

    Peak output recorded as 578 watts, to obtain RMS voltage multiply by .727

    578x.727= 420 watts rms

    This is NOT the most accurate way to find the true RMS rating of your amplifier, there are a lot variables that are not accounted for when you test like this, therefore this test is only to be used to give a better understanding of what your amplifier is capable of doing.




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    Re: Underrated, overrated... How do you know?

    Quote Originally Posted by jsloan10
    Take a DMM (digital multimeter)
    set it to AC voltage, with the appropriate sensitivity
    hold test leads to the +, - of the channel being tested
    blast tone or music at maximum unclipped level
    record highest voltage displayed
    multiply voltage by itself then divide by resistance of speaker connected to channel.

    for example-
    34 volts peak is recorded, channel is connected to a 2 ohm speaker/load
    peak volts squared
    34X34=1156

    divided by resistance
    1156 / 2= 578 watts

    Peak output recorded as 578 watts, to obtain RMS voltage multiply by .727

    578x.727= 420 watts rms

    This is NOT the most accurate way to find the true RMS rating of your amplifier, there are a lot variables that are not accounted for when you test like this, therefore this test is only to be used to give a better understanding of what your amplifier is capable of doing.
    interesting hope it works that way



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    Re: Underrated, overrated... How do you know?

    That would probably work running a 60hz sine wave.




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