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99concorde
10-22-2003, 09:04 PM
Is 3/4 inch particle board as good as mdf. at lowes all they had was like birch mdf and it was 35dollars for an eight by four sheet. the particle board was almost the same and cost 9 dollars for the same sheet.

Gauntlet
10-22-2003, 09:05 PM
No. Use MDF.

lombardo
10-22-2003, 09:14 PM
No. Use MDF.

Agreed. My first box was out of PB...no comparison

99concorde
10-22-2003, 09:24 PM
crap so if i already bought and cut it it wont work at all. why is it not as good.

Gauntlet
10-22-2003, 09:37 PM
It's not as sturdy and has a tendency to flex....I suppose if you're running a small amount of power you can get away with it, but if it's anything significant, MDF is the way to go.

If the box flexes and you still don't want to buy MDF, you could try soaking the box in fiberglass resin....

99concorde
10-22-2003, 09:45 PM
well im going to put two re8 in it. with about two hundred apiece if the porousness(sp)is going to be a problem i could use a sealer of some sort. i really just wanted to see what the eights sound like but since it looks like i blew my twelves i will have to run the eights for a little while.

marleyskater420
10-22-2003, 10:19 PM
well im going to put two re8 in it. with about two hundred apiece if the porousness(sp)is going to be a problem i could use a sealer of some sort. i really just wanted to see what the eights sound like but since it looks like i blew my twelves i will have to run the eights for a little while.
contact loneranger on here,pm him with your query.he can build you a box thatll be better than your particle board and itll wang like a mofo.i know the one he built for my friend hurts my ears.

Gauntlet
10-22-2003, 10:25 PM
well im going to put two re8 in it. with about two hundred apiece if the porousness(sp)is going to be a problem i could use a sealer of some sort. i really just wanted to see what the eights sound like but since it looks like i blew my twelves i will have to run the eights for a little while.

With a properly built box using the particle board, you should be ok....

99concorde
10-22-2003, 11:20 PM
yeah i think it will be alright, i will probably use some sort of sealer for the inside. how much different will the eights sound than my twelves.

bigred78797
10-22-2003, 11:58 PM
It all depends on what kind of box and the quality of the box. If you had twelves then you had more cone area thus the twelves should be louder if put in the same type of box. but if the twelves were in a sealed and your now going with a ported for the 8's then you might see a slight gain or a large gain... it all depends on the box. But if your twelves were in a sealed and the eight's in a sealed then you will probably have a slight decrease in volume.

LoneRanger
10-23-2003, 02:06 AM
if you brush a nice coat of resin on that stuff, it'll do just fine. glue it, screw it and cover it inside and out with fiberglass resin and it'll be solid. You probably want to double baffle the face too.

i tried to make a box out of that stuff a long time ago, and i wasn't too pleased with the results. 1" masonite mdf is my favorite building material at the moment.

99concorde
10-23-2003, 10:51 AM
what is double baffel. how hard would that be to do.

LoneRanger
10-23-2003, 12:48 PM
double baffle means two boards instead of one

99concorde
10-23-2003, 10:53 PM
So instead of of 3/4 inch board make two. wont that be really thick. maybe i dont understand.

jbl_marshall21
10-24-2003, 12:52 PM
i think double baffle means, like after u build ur box, u put another board on each side of the box. it reduces the flexing. it will give u an inch and a half thickness. that could help ya out some.

99concorde
10-25-2003, 12:10 AM
well i just built my first box. not bad i think. dont know the volume or whatever. its two feet long. one foot tall and one foot deep. so what would the volume be. i think maybe i made it a little too big. oh well. i did put a divider in the middle. there will be two re 8s in the box. all i have to do is seal the outside.

Gauntlet
10-25-2003, 09:22 AM
well i just built my first box. not bad i think. dont know the volume or whatever. its two feet long. one foot tall and one foot deep. so what would the volume be. i think maybe i made it a little too big. oh well. i did put a divider in the middle. there will be two re 8s in the box. all i have to do is seal the outside.

{[(24 - 1.5) x (12 - 1.5) x (12 - 1.5)] - [(12 - 1.5) x (12 - 1.5) x (.75)]} / 1728 = 1.39 cuft. before driver displacement = way too big. The recommended volume is like .2 or .3 cuft. per driver in a sealed enclosure....

jbl_marshall21
10-25-2003, 10:31 AM
{[(24 - 1.5) x (12 - 1.5) x (12 - 1.5)] - [(12 - 1.5) x (12 - 1.5) x (.75)]} / 1728 = 1.39 cuft. before driver displacement = way too big. The recommended volume is like .2 or .3 cuft. per driver in a sealed enclosure....

but thats recommended. who listens to that????? ha, it might work for the time period.

LoneRanger
10-25-2003, 11:54 AM
but thats recommended. who listens to that?????

People who want to keep their subs from severely bottoming out?

Gauntlet
10-25-2003, 12:20 PM
People who want to keep their subs from severely bottoming out?

Where are you?

LoneRanger
10-25-2003, 01:09 PM
Where are you?

The same place I always am....

99concorde
10-25-2003, 07:42 PM
lol, so not good huh. well theres always next time. ill just keep the gains turned down. it wont be so bad.lol. if so it was only like 70 bux so it wont be a huge loss. just call it a learning experience. :thumbsup

LoneRanger
10-25-2003, 08:57 PM
lol, so not good huh. well theres always next time. ill just keep the gains turned down. it wont be so bad.lol. if so it was only like 70 bux so it wont be a huge loss. just call it a learning experience. :thumbsup

Those gains had better be pretty ****ed low :)

You could put something inside the box to take up airspace. The odd thing about 8's is that they tend to get louder and sound better in the small boxes they were built to perform in. I'd hate to see you tear up a couple of really nice drivers just because you didn't want to build another box for them....Rather than just letting them hit bottom and die a horrible death, you could always sell them to me for $25 each :cool:

99concorde
10-25-2003, 10:26 PM
what should i put in the box. open to suggestions. this was my first box. and i just kind of guessed as to how big i should make it.

LoneRanger
10-25-2003, 10:58 PM
what should i put in the box. open to suggestions. this was my first box. and i just kind of guessed as to how big i should make it.

I dunno....bricks......2x4's.....whatever you've got laying around that's pretty big, solid, and can be somehow affixed to the inside of the box. If you have a little brother or know a midget, you might get him to sit inside there or something....

99concorde
10-26-2003, 04:43 PM
little brother.lol. got two two twenty five plus pound little brothers. may have to make them fit. but really do you think taking some of the left over wood and stacking it inside. how much what lenght what not.

Gauntlet
10-26-2003, 05:48 PM
little brother.lol. got two two twenty five plus pound little brothers. may have to make them fit. but really do you think taking some of the left over wood and stacking it inside. how much what lenght what not.

Well you'd probably want to get around .5 - .7 cuft taken out, so like anywhere from 900-1200 square inches total. You could put some extra baffles on the bottom and the top of the inside of the box. The dimensions of each sheet would be 22.5 x 10.5 x .75, which is 177 square inches per sheet. 1200 /177 = 6 or 7 of those sheets = .61cuft (6 sheets) or .71cuft (7 sheets) taken out. If you just have random scraps laying around and cant make a sheet that size, just calculate the square inches of each sheet (H X L X W), add the totals together, and divide by 1728 to figure out how much cuft. it would take up total.

It might be more cost feasible to just build a new box....

99concorde
10-26-2003, 08:46 PM
well i only paid 9 dollars for the sheet. and it was eight feet by four feet. so it really isnt that expensive. i will put the extra stuff on the inside. a couple on the top and a couple on the bottom. thanks for the help guys. i will see if it works. maybe post pictures although they might be a bit embarressing. on a side note any suggestions on a box for a single type s 12

jbl_marshall21
10-26-2003, 09:07 PM
well i only paid 9 dollars for the sheet. and it was eight feet by four feet. so it really isnt that expensive. i will put the extra stuff on the inside. a couple on the top and a couple on the bottom. thanks for the help guys. i will see if it works. maybe post pictures although they might be a bit embarressing. on a side note any suggestions on a box for a single type s 12


1 cube......