or would a 5 or 6 channel be a better idea?
You can, but i asked something similar awhile ago, apparently its bad for sound quality, and im not sure the crossover goes that high, hopefully someone can give you a little more detail
99 Honda CRV: (Always Changing) ___________ 79 F-150: Show Truck ________________
-Head Unit: Kenwood DNX-692HD_____________ -Head Unit: Eclipse CD7100
-Sub Stage: Focal KX40 16"_________________ -Sub Stage: Looking
-Mids/Highs: Focal KRX & PHD AF____________ -Mids/Highs: Scan Speak & Blaupunkt
-Sub Amp: Mosconi AS200.4_________________ -Sub Amp: American Warrior Set (Zed Built)
-Mid Amp: Mosconi AS200.4_________________ -Mid Amp: ^^^
you can run the 4 bynines off 2chs bridged, but wiring them in parallel will change xover point/slope. then run supertweeters off the other 2 chs.
My suggestion would be to get a cheapo 2ch for the supertweeters....