RMS Question
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RMS Question

  1. #1
    Senior Member HPBoats83's Avatar
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    Default RMS Question

    So if the max RMS = 100W and Peak is 300W in regards to a set of speakers, what's ideal? Should I find an amp to run 100W to them or more or less?

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    Junior Member KustomKoncepts's Avatar
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    Typically, your amp will not see it's "PEAK" numbers and you should never pay attention to those numbers. They are for marketing. You should mostly look for an amp that is specifically rated to run in the conditions you will have (i.e. 14.4v, etc) and purchase it.

    As a note. I sell JL stuff, an XD300/1 is set to run 200w rms @ 4ohm @ 14.4v. Now if your battery drops down to 12.5v then you only see 160w @ 4 ohms. But all the "peak" numbers you see are usually quoted at 16.6v which most batteries will never see with the draw of all the modern day electronics in vehicles, boats, etc.

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    Senior Member HPBoats83's Avatar
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    Quote Originally Posted by KustomKoncepts View Post
    Typically, your amp will not see it's "PEAK" numbers and you should never pay attention to those numbers. They are for marketing. You should mostly look for an amp that is specifically rated to run in the conditions you will have (i.e. 14.4v, etc) and purchase it.

    As a note. I sell JL stuff, an XD300/1 is set to run 200w rms @ 4ohm @ 14.4v. Now if your battery drops down to 12.5v then you only see 160w @ 4 ohms. But all the "peak" numbers you see are usually quoted at 16.6v which most batteries will never see with the draw of all the modern day electronics in vehicles, boats, etc.
    Interesting, thanks for the response.

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    also, usually when you get away from cheaper brands like legacy, pyle, pyramid, etc... amp manufacturers dont even usually list peak numbers. fosgate, audioque, sundown, zed, incriminator, mmats, etc... all just list rms power ratings, some of them are rated at 14.4, others are rated at 12 so you will actually get more power at 14.4 (older RF amps were usually WAY underrated for instance). even if an amps spec is listed @12v dont be scared to run it if at ~14 volts. I do think some companies like pioneer, kenwood, infinity might list both rms and peak though but I cant remember for sure.


    as for speakers, dont pay any attention to the peak numbers, just worry about the rms ratings when looking for an amp. also dont forget about the differing resistances of voice coil configurations when looking at amps listed outputs. and when dealing with subwoofers especially you cant just rely on the numbers. a large ported box and you might not be able to feed them rms power before they hit their mechanical limits. smaller sealed boxes usually allow higher power handling than ported to an extent.

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    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by HPBoats83 View Post
    So if the max RMS = 100W and Peak is 300W in regards to a set of speakers, what's ideal? Should I find an amp to run 100W to them or more or less?
    I got rid of all my amps and speakers a long time ago !!!

    We went to headphones and intercom system for boat to boat and pit crew com

    A I-pod or I phone gives us music and phone calls auto mutes when you speak

    The best part is you don't hear the engines or wind noise all day
    Last edited by BigSteve; 03-16-2012 at 06:16 PM.
    If you ain't the lead dog the view is always the same !

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    Junior Member KustomKoncepts's Avatar
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    Quote Originally Posted by BigSteve View Post
    I got rid of all my amps and speakers a long time ago !!!

    We went to headphones and intercom system for boat to boat and pit crew com

    A I-pod or I phone gives us music and phone calls auto mutes when you speak

    The best part is you don't hear the engines or wind noise all day
    I thought that was part of the fun... Until you can't hear at all anymore of course.

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    Quote Originally Posted by HPBoats83 View Post
    So if the max RMS = 100W and Peak is 300W in regards to a set of speakers, what's ideal? Should I find an amp to run 100W to them or more or less?
    Ideal is to have an amp that is larger than the RMS rating of the speaker. What I try to use is 125% for Mid/Hi speakers and 150% for subs. So if you have a 6.5" coax that is 100 watts RMS you want an amp that is 125 watts RMS.

    Now that is ideal. For the mid/hi speakers it is ok to just have an amp with the rated RMS power of the speaker, you just have to be smart in how you use the system. For subs I can not stress how much better it is to have the bigger amp. The subs will sound better, and your amp will last longer and run cooler.

    The reason you want larger amps is for headroom. It's kind of like having too small a motor in the boat, it has to run wide open all the time to get the speed you want. Where as if you had a larger engine it does not have to work so hard all the time. The other thing is that running a small amp into distortion will blow speakers far easier than an amp that is rated for more than the speaker requires.

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