I hope to be able to give a review of the Demon after this weekend. I have the downfiring box built, 3" of space between the bottom of the box and the floor. Specs say 1.1cuft is optimum, so that's what I made it. Used binding posts instead of a terminal cup. The binding posts take banana plugs, so that's what I'll put on my 12ga speaker wire that came in the other day. I'm making it so in the rare event that I have to remove the box, it won't be a complete PITA. I thought I had more room under the steering column for the micro sub amp, but I do not. Since this had to change, my 3' RCA cables won't work, 6' cables will be in tomorrow. I have longer 8ga power/ground cables on hand to make it to the distro block. The distro block is 4ga to to battery/ground.
I'm putting the amp in the locking center console, attaching it to the inner liner of the console via blind rivets. I'm going to drill holes in the bottom of the liner for cabling. On either side of the cables, I'm going to drill small holes that I can feed zip ties through to further secure the cabling. There is a factory cutout in the center console for a factory sub. I cut a matching hole in the console liner and I'm going to mount the amp across this cutout so that any air in/out of console has to go around the amp.
I've got a pretty neat, IMO, idea to secure the box in the back of the jeep. I don't go around with the top completely off very often, but I do fold the soft top back, take the doors off, and use tube doors a good bit. I want to keep lazy thieves out. Unless the have a way to open the locked tailgate, there's one mounting point in the rear that they will not be able to access. And unless they carry around a Very large Torx bit and ratchet/impact, the exposed second mounting point will be solid as well. I bought 2" wide, 1/8" steel flat bar to attach the box to the bed. Sub is mounted by non-standard machine screws through threaded inserts. They are pretty long, so I do not envy someone trying to unscrew it from the bottom. I'm not saying it's theft-proof, but they are going to play hell trying to get it out.
As far as the box itself, I'm going to bed liner spray all the exposed MDF, then go back and use black carpet over the bedliner spray to match the interior.