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Hi, Im not too sure how Peak And RMS really decide how the sound will be.
i do know most the off brand amps advertise their peak power. I know that it has nothing to do with the real power being put out.

My question is do any of you thing a single 12'' Punch Sub at 200 Watts RMS
Powered by A Pioneer Mono Amp 250 Watts RMS (both at 4ohms) will be worth installing. Is that going to be something that will make some decent sound or will it be a waste of money?

sorry i just dont know much more than installation

 
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what kinda box is it going into? What kinda music do you listen to? What kinda results are your expecting?

 
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i listen to alot of different music. i would like to put it into a deep box. I would like to have a nice thump. i dont really want to rattle windows by any means. But i also dont want it to be a waste of money. Ive seen some really bad set ups. the kind that have worse base than our stock speakers

 
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nahh man, you should get soe alright bass. Just step up on the amp a little bit. add lik e50 more buck and get like a 500RMS one,

 
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but the sub is rated at 200rms

 
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well its better to be over then under. Trust me over is better

 
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that combination should suit you fine. Just make sure the speaker is in the proper sized enclosure, and you'll be golden

 
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go for a ported box (they are more efficient). and tune low (~ 32 hz).

that 250rms amp with that 200rms sub is a perfect match.

 
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thanks guys

 
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Is something like this what i need?

 
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if the specs of that box match the recommended enclosure size for your speaker, then yeah it'll work

 
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Yuck bandpass... They're easy to mess up, and you don't hear the distortion as much in them. But whatever floats you boat. As for ported being more efficient, well, not the most efficient. that title goes to narrow-bandwidth bandpass designs, ported and wide-bandwidth bandpass are next, so they're second most efficient. Sealed, generalls speaking, is going to offer a better midbass transition. Sealed are also going to offer better transient response. Bandpass are essentially a sealed box with a port filter, so to speak. They limit your driver's high-end capabilities. If your midbass response isn't god with your other speakers, bandpass really isn't the best choice for you. Without the midbass response from your other speakers, your system will sound like crap, in short. The ported, generally speaking, will allow you to go low, and into the lower mid-bass respone ranges. They're a tad more versitile in that aspect. Sealed is going to transition better than both. It really depends on you though. What do you want, how much room are you working with, etc.

http://mobile.jlaudio.com/support_pages.php?page_id=148
http://mobile.jlaudio.com/support_pages.php?page_id=147

Those should help you decide which is better suited for you. Lots of useful information in both of those tutorial links. I'm not advocating that any box is better than the other, as all fail in some aspects while they accell in others. None are going to be superior or perform better in all aspects, that's why there's no magic box.