I am using a pair of "Kenwood KFCXW-1000F eXcelon 10 inch Shallow Subwoofer"
mounted in a "ASC Chevy Silverado or GMC Sierra 2500 & 3500 HD Crew Cab Truck 2001-2006 Dual 10" Subwoofer Custom Fit Sub Box Speaker Enclosure ", which fits, but not correctly.
Up front I have "Pioneer TS-A1685R Car Speaker - 1 Pair (6 1/2"- 6 3/4") 350w max 4 Way Voies " back doors are "Kenwood KFC-1795PS 6 3/4" Performance Series 3-Way Flush Mount Coaxial Car Speakers" all powered by an "NVX JAD900.5 800W RMS Full Range Class D 5-Channel Car Amplifier".
It is not the loudest thing on the planet, I am more into clean then loud. I can turn the head unit all the way up without any distortion. Setting the inputs on the amp lower will give me more volume, but start clipping at high volume. It is more then loud enough to get a headache after 5-10 min at high volume. I set the crossover in my HU for front and rear HP at 80, sub LP at 70, 24DB. The mirrors shake quite well, I am starting to like "animals"..