No. It's plywood. Take the piss... i don't care? MDF = medium density fibrebaord... as used on previous installs.
Old install
MDF is typically the chosen wood for sub boxes, as it's cheap yet versatile and strong. Plywood is better as it's slightly lighter, but subject to less box flex if braced properly.
Skinny - Yeh i have another baffle to put ontop of that, was just to test the box really. The top baffle has a rounded port, i need to flare the tits off it when i finalise the box (carpet it). I've got a new alt on order (130a one) and i'm running yellowtop up front and split charged to 2 x yuasa 6v's 160ah. Theya re solid. Never seen below 13volts engine on to that amp when it's been in my hands. Check the thread on TA for more info.
Willie the kid - love for money.
Apsoultly lovely. Late night tip is also very nice, bit high for me though