Randy,
While the advice from Headline is correct, you do need plenty of power for subs, that is not to say that your 420 watt amp won't suffice in situations where extreem output isn't needed.
In a situation like a wedding or small event bridging your small amp will be more than enough. In larger or more rambuncious crowds where heavy bass is needed then you need to be looking at more power and more subs.
Correct me if I am wrong, but I believe that the CE 2000 isn't going to give you any more power in stereo than the ADJ amp is going to give you bridged. If the speaker is rated at 500 watts continuous or RMS bridging your CE2000 is going to give you the power you want.
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