I want to put them under the back seat of a 2001 Chevy Z71 ex-cab. I have about 1.6 cubic ft (not to sure) in a ported box with them facing to the front of the truck. I have a arc audio ks 1000.1 right now. I have two Jl 10w6v2 right now with one Arc Audio ks 1000.1, they are down firing in a ported box tuned to 31hzs ( i don't like the down firing ) I'm Looking into getting a new box with some FI (not sure witch ones yet) tuned to around 33hzs and maybe adding one more amp for the subs, I just want a little more then what i have right now... Sorry for putting in the wrong section and thanks for all help!!!!!!! 2001 Chevy Z71 Ex-Cab Alpine CDA 9886 deck Clarion EQS746 Arc Audio 265 Conponents Arc Audio KS 4050 xxk Arc Audio Kar 1000.1 (taking out) Arc Audio KS 1000.1 (putting in) 2 Jl 10w6v2 Yellow Top Batt.