whats up guys?

i was wondering if running 6X9's in abox behind the seat would sound good.. instead of the 4x6 in the doors?

http://www.sonicelectronix.com/item_...TS-A6983R.html this is what i had in mind off a 4 Channel X 60RMS

Encased in [http://www.amazon.com/6x9-Truck-Styl...speaker+boxes]

or [http://www.amazon.com/Atrend-Series-...speaker+boxes]

let me know your opinions. or suggestions.