quick queston about mdfm

goingganzo · January 2003

how much do a 4x8 sheet of 3/4 mdfb cost? this weekend i am going to get 3 or 4 sheets to make my monster dual av15 sub. it is 730 liters 48 in long by 43.5 in deep and 24 in high. this is all going under the stairs in waisted space. olny thing is i olny have 3 feet long clamps. i am going to have to barrow some from friends. but i will get all the cuts done at home depo they usaly give 3 free and charge like 50 cents after that. worth the 1.50 i olny have a tabble saw not good with big sheets of wood.

how can i clamp with out clamps? can i get some help?

brettw22 · January 2003

When I last checked a few months ago, it was around $17 for a 4'x8' 3/4 sheet.......

That sounds like a ridiculously huge sub. You don't need a 4' x 3.5' x 2' box to get good bass...........

F1nut · January 2003

gg,

You could use screws and glue to assemble it. I presume that you're going to butt joint the boards and if so, just using glue alone would result in a poor bond. If you planned on a different type joint, then tell me what it is and I can advise further.

F1nut

Dr. Spec · January 2003

I hope you have design/build plans for this box. Boxes like this need immense amounts of internal bracing and have interior walls with holes/baffles. Don't just screw/glue together 6 sheets of mdf and hope for the best. It will sound terrible if it resonates and flexes. Look at the boxes on the Stryke website for clues about what I am saying. BTW, for the price and free assembly, I'd order the dual 15.4 or dual 15.6 enclosure for $400 ad be done with it. By the time you figure in your time and labor and inevitable screw-ups, buying the pre-fabbed enclosure make a ton of sense.

http://www.stryke.com/

goingganzo · January 2003

i am going ported not pr they dont sell boxes. i am going to use internal braceses and all walls exept the top and botom will be dubble thick. i dont have enough room to make it any higher. i am prety good at the designing thing. when i was in hs i wanted to be a architect. i took alot of art and drawing and architect and some cad classes. lus my dad is a architect.

so if i glew and screw but pre drill the holes first so i dint crack the mdfb it will be good. i plan on makeing my own braices out if the scarp . i will be adding 3 in stifining braceses and vertal suports.

Ron-P · January 2003

Do yourself a favor and buy a circular saw and cut all the mdf yourself, avoid HD. They will not be detailed enough on their cuts.

Peace Out~:D

hoosier21 · January 2003

what is mdfm?

Home depot sells the MDF in 4'x2' sheets, this will cut down on a lot of your cutting, also find somebody who has a table saw, you will need it if you are cutting 8'x4' sheets, good luck.

I have to design me a couple of boxes myself and get busy building again.

Ron-P · January 2003

i olny have a tabble saw not good with big sheets of wood.

He's got the table saw Hoosier, that is why I suggested a circular saw, they work great for cutting down large sheets of wood before making there way to the table saw.

I need a new speaker building project myself.

Nothing better than looking into a glass of beer and seeing fine particles of MDF floating around.

Peace Out~:D

RuSsMaN · January 2003

And we have a NEW sig!

Ron-P · January 2003

Classic I tell ya.

Peace Out~:D

phoneisbusy · January 2003

Originally posted by Ron-P
Do yourself a favor and buy a circular saw and cut all the mdf yourself, avoid HD. They will not be detailed enough on their cuts.

Peace Out~:D

I agree about HD not being detailed enough on their cuts. It still might not be too bad having them precut the mdf. Save some wear and tear on your saw blades (mdf is murder). You just have to add a extra inch or two and do the finishing cuts yourself.

Plus, if you only have a sedan w/o roof rack...

Are your clamps pipe clamps? If so, I'd pick up some 4-5 ft
lengths. There are web clamps out there but I'm guessing you want the clamps to keep everything square?
Some links to woodsmith tips that might be helpful. I happen to like the site.

http://www.woodworkingtips.com/etips/etip0090800sn.html
http://www.woodworkingtips.com/etips/etip010810sn.html
http://www.woodworkingtips.com/etips/etip010817sn.html
http://www.woodworkingtips.com/etips/etip020315wb.html

Good luck goingganzo!

Dave

p.s.

I was contemplating building my own subwoofer eventually. I have a generic entry level sub which is quite good for HT but I find it a bit... lacking musically. For the Polk-ites who have built their own, is it worthwhile qualitywise or is one better off buying a kit or brand name?

burdette · January 2003

If you're concerned at all about expense, try redesigning your box with the largest dimension at most 48"... otherwise you cut into the second half of the sheet.

I, too, would buy a circular saw and do the cuts yourself. You can get decent accuracy with a circular saw and homemade cutting guide. Plus, you can do the cutting on the floor with the board supported only with 2x4s... no need for sawhorses nor even a second person.

Ron-P · January 2003

For the Polk-ites who have built their own, is it worthwhile qualitywise or is one better off buying a kit or brand name?

Yes, it is worthwhile to build your own sub, if you like to do it. It is fun and much more rewarding and cheaper, a lot cheaper for better quality. I was a little leary at first, but the sub came out better than expected (for a sealed design). Now, after some help for forum members I'm going to cut back into it and port it. Tuning it to 17Hz. Try and find that in a sub for $450 bones.

I love to build, so for me it was a blast.

Peace Out~:D

quick queston about mdfm

Comments