Hmmm well if it has a cross over already then it should be doing that in the first place. You probably wouldn't have a problem just replacing the woofer itself and not the tweeter. I've done it before.
My recommendation would be if the nakamichi amp is a 4 channel, you should have it power the speakers in the car, and get another amp to power the 8's. This of course would be your best method, but if you have a 2 channel running all that well definately you should look into putting on another amp to distribute the load.
Hope that helps,
Alon
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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon
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