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What is the rms power rating on those subs?There is no such thing as under powering a sub. If you have a amp that puts out only 200 watts rms above the subs rating you can adjust the gain to not over power them. You have a lot to learn about car stereo ! Well yeh actually you can under power them . considering they are rated for 1000 RMS and they are only getting 750 a piece I'm pretty sure that's underpowering. And yes I have a lot to learn that's why I'm asking questions on an audio forumBy there is no such thing as underpowering he means it doesn't matter to the woofer, and for example, use a larger box and you won't need as much power to do the same as you would in a smaller enclosure. RMS is just thermal rating, not a "this is required to make it work" rating

And happy B-Day!!!

Modeling is computer simulation that provides you with a predicted response. Maybe someone on hear will run the numbers for you and give you response plots to compare. If not, try and Google loudspeaker modeling programs and Thiele Small parameters. This will help you get started. Amps don't pull watts. You can maximize your power output by keeping your subwoofer impedance as close to 2 ohms as possible, but it isn't nearly as important as having an efficiently designed enclosure...

The RMS rating has nothing to due with output, at. If you want to know what option will be louder you need to model to get a baseline... All that baseline will do will show you the potential difference in output between the drivers. You won't know what the overall output will be unless you know what you cabin gain is, exactly...

I would think "Brown Christmas" would mean when you opened a gift that you didn't expect and shat yourself..