8 replies to this topic

[PH-346]

hey guys, sub box is going to have a "window" the MDF is 19mm, window will be about 800x300, is 6mm to thin?? (i can get 6mm sheets free )

cheers

[MrAddo]

I would say, yes, way too thin. Perspex will flex as much, if not more than MDF. Especially over that size. Probably needs to be at least as thick as the rest of the box.

[268669♫]

Not for a window that big. it will flex. You'd need at least 12mm but I would go even thicker for such a big area. 18mm would be my choice. Especially since it wont be braced.

Ant

[broadz]

Glass is a far better choice, doesnt scratch and doesnt need to be as thick for it to be strong

[Captn_Awesome]

^ and probably costs less than perspex

[Big_Valven]

It depends too if you're using acrylic or polycarbonate. Perspex is a trademark of one brand of polycarbonate but people rarely end up with that actual product.

6mm will definitely be too thin, but if it's free why not try it out and find out for yourself? Opinions vary wildly as to what is suitable. I'd recommend 10mm polycarbonate, even at that thickness it will be a very heavy, very strong panel. (And expensive!)

Edited by Big_Valven, 18 April 2012 - 11:11 AM.

[Mr. Drifter]

if you can get 6mm for free, why not try to stick them together, to make it twice as thick? Although having said that, I suppose they could flex and vibrate off each other :/

[bobo333]

ive used 10mm polycarbonate for a 400x400 ish window in a sub box and it was only just stong enough (small amount of flex) but this was with a 15" sub running 3500w so depending what sub you have it might be ok for you

[PH-346]

thanks for the feedback guys!! mates got 12mm in my size lying around! win! (he gets heaps so if needs be ill put a piece down the middle running cross ways for strength)