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After a lot of help from the people on this forum the set up i bought was a:

kicker kx400.1 (400-450rms)
Alpine Type R 12" (500rms)
(only $250 on ebay)

Now I have one last question that has been bugging me. the Kicker amp is going to be pushing between 400-450rms to the 500rms sub.

Now will there be a huge differnence in sound quality and loudness if i were to get an amp that could push the full 500rms or more, or will there only be a small difference in sq and spl?

(b/c it is only about 50rms that i'm lacking)

thanks

You probably wouldnt notice a difference by ear. Nothing to worry about at all.

not a big deal at all... it will sound great i know someone who was pushing a type R with a 400 watt rms amp and it sounded great

The slight difference in power may net a loss of 1 dB at the microphone at most...

There is no way you would be able to detect that with your ears...

I dont know what kicker rates their amps at, but if it is rated 400wrms at 12.5 volts, then you will be pushing slightly more power when the car is on and running, since most charging systems push somewhere between 13.8 and 14.4 volts.

If its an unregulated supply that is.