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Thread: if amp outputs 600w, and sub is 500w RMS...good/bad?

  1. #1
    Variable Bitrate
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    if amp outputs 600w, and sub is 500w RMS...good/bad?

    If the amp is rated at 600watts, but the sub is 500watts RMS, would that blow the sub, even if the gain is turned down?

    from what i read, lowering gain doesn't reduce the watts outputted, so would that be a bad match?

  2. #2
    FLAC
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    Lowering the gain DOES reduce the output but not like a volume knob. You can always turn down the bass output of your source unit.

    The gain knob is to match the output voltage of your source unit to the input voltage of your amplifier so you get a smooth linear volume increase/decrease instead of a stair-step effect. You can cheat a little and turn this down(which is actually up) a slight amount.

    Confused yet?

  3. #3
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    completely confused, i'm pulling out my hair here, cuz i ordered the 500w sub, thinking that i could just lower the gain on the 600w amp, to keep it below 500w, but then my friend says that lowering the gain will not affect the watt output, and that it could blow my sub. So i just went back and had to cancel the order of the sub/box, and now i'm rethinking my life again.

    So, to make this work, in english, what do i have to do?

    amp: p6002 rockfordfosgate, 600w RMS bridged x1 @4ohm
    potential sub: alpine type-r, RMS: 500watts - 2x 2-ohm

  4. #4
    FLAC
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    Turn the gain up

    When you turn the gain down the input voltage is amplfied more. When you turn the gain up, the input voltage is amplified less. If you look at your gain knob, it's exactly backward from what you think is up and down. Higher voltages will be listed counter-clockwise from lower ones (unless you've got a little ramp graphic which is totally not helping). Thus, if you tell the amp that your input voltage is higher than it actually is by turning the gain up, it'll amplify the incoming signal less giving less volume.

  5. #5
    MySQL Error scott_fx's Avatar
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    in short...no you won't blow your sub. just make sure you're not giving the sub a distorted signal and it'll handle it just fine. Look at the sticky in the audio subforum on how to set your gains and you'll be good to go
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  6. #6
    FLAC
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    psst, Scott, we're in the audio subforum

  7. #7
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Shadow View Post
    psst, Scott, we're in the audio subforum
    well..we are in a thread in the audio subforum. haha and i'm still drunk from the wedding i was at last night so cut me some slack :-)

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  8. #8
    Constant Bitrate bluehcc's Avatar
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    600watt from amp is that RMS or peak? if its RMS then its good. Use this 100 extra wattage to fire the sub will give u crispy punch, which is damn good...
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  9. #9
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by bluehcc View Post
    600watt from amp is that RMS or peak? .
    he stated 600 wrms


    Quote Originally Posted by bluehcc View Post
    Use this 100 extra wattage to fire the sub will give u crispy punch, which is damn good...
    what do you mean 'to fire the sub'?
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  10. #10
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    scott, I trust you with this stuff, and I wont come back to bite you in the *** if it messes up, but you say that it'll do the trick?

    My friend said install a resistor...but that seems too complicated for me, atleast this early stage of my electronics learning.

    so, turning the gain down(counter-clockwise) is in fact turning the gain up?

    someone said about turning down volume

    so if my master volume on my sound card, is at...say 75%...would that mean that my amp is putting out 75% of the watts? or is there no correlation?

    simply put: what on my whole setup can i adjust, to reduce the watts being sent to the sub?

    or if a little overload is okay, i'll stick with that

    500RMS, 1500peak sub

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