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Ok, the basics.
Your subs dont run at RMS. They accept that value on a continual basis. So if you got a sub capable of handling 400 WRMS, that means you can feed it 400 WRMS. Now some subs can be overpowered effectively, some cant. The number is there for a reason.
Next, the amp is what produces the power. You can have the best subs around, if you dont have an amp to properly push them it wont work good.
Generally speaking, a sub usually only needs 80% of its rated RMS to do its job. So if you got a 100 WRMS sub and run it at 80 WRMS then again at 100 WRMS you probably wont hear an audible difference.
Box. You can have the best amps and subs, if you got a crappy box you got a very large problem. Not all boxes are created equal!
Its all relative and all goes hand in hand.
The sales people should be able to help you with an amp selection after you figure which subs you want. Just remember the above information.
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-Ryan
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