The Yukon XL has a fold-down center seat in the front, I was going to remove it and build a center-console enclosure. But, I sometimes have a truck full of tools and materials, keeping the seat allows me to have two passengers if necessary.
Not going huge with the build, just an enclosure of about 4 1/4 cu ft in the rear quarter. Building from the floor right up to the window line, 10" subs recessed in 1 1/2" and firing into the rear, 4" port forward. Only running 500 watts to the pair of 10's, not going to move a ton of air, so I don't think I have to worry about any port noise.
The JVC head unit I just swapped in for the stock unit sounds just fine, plenty loud (for now). Just going to run the Sub Out to the Lightning Audio 1000.1D. I am going overkill and running 1/0 ga wire to a distribution block, and then 4 ga to the amp. I have a 600 watt power inverter I'm going to run off another leg of the distribution block. Both will be mounted under the rear seats.
I have plenty of room under the seats, even folded down. My kids are gargantuan (son is 15 today, and is 6'2, 350 lbs, daughter is 13, and is 5'11"), so I had to move the rear seats back - made some brackets to move them back 2 1/2", and raised them up about 1/2" in the process. Gave me enough clearance for the amp and inverter. I actually have enough room if I should want to add a 4-channel amp for the doors.
When I actually get everything in and completed, the rear doors, quarter windows and hatch are getting tinted over the factory tint with 20%. I don't want anyone to see anything in the rear, but I do need to be able to see when backing up - otherwise I'd go 5% all the way around.
