How to fasten down a Sub box?

["350Vortec"]

Hey there guys, My buddy just spent $300 on this sub box https://www.wholesalecarstereo.com/images/P/C15HC00C10A-T45_m-05.jpg

And he ended up not using it because his dad bought him a better box/sub combo for his pickup. So i ended up getting it for free.

Its just as loud as my old box but the 10" sub seems to hit more notes then my 12". And it saves ALOT of space in my truck! My question is, How can i fasten it down. My other box being 3/4 mdf just stayed lol.

[mikeykey]

you could always put it in the cargo area, against the rear of the back seat. Then stick the rigid side of some velcro on it the back and bottom of it. Velcro usually sticks good to soft carpeted areas. Just a thought.