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Supergumby5000
05-29-2009, 04:02 PM
For an 18" subwoofer (18.25" actually, 16.75" mounting hole), do yall think a double baffle is necessary for a 20"x20" baffle? I feel like even if i did have a double baffle in this situation, there really isnt any room for flex :rolleyes:


lets here your opinion

oldschoolboomer
05-29-2009, 04:30 PM
i prefer bracing to doubling 90% of the time

Supergumby5000
05-29-2009, 04:32 PM
i prefer bracing to doubling 90% of the time

So do i.


However, that does not answer my question whatsoever

MikeyB
05-29-2009, 04:35 PM
You wont have a problem running a single baffle if it is 20 x 20, what kind of sub?.

jmanpc
05-29-2009, 04:36 PM
Don't think you'll see much flex, seeing that tere will be about an inch on each side of the woofer :laugh:

Skip01
05-29-2009, 04:37 PM
I just like double baffle for flush mount. Looks ****.

You should be fine.

What ya got planned?

xtremebassjunky
05-29-2009, 04:38 PM
if it's that small a box... nah no need to double baffle

JimJ
05-29-2009, 04:45 PM
If you aren't quadruple baffling, you're not ballin'...

http://img154.imageshack.us/img154/9066/bibh.jpg

jmanpc
05-29-2009, 04:47 PM
If you aren't quadruple baffling, you're not ballin'...


****'s weak.

jdc753
05-29-2009, 04:53 PM
I would say non needed unless you wanna do the flush mount this which as mentioned above is **** ;)


But come one now your a civil engineer you can figure it out :laugh:

Xprime4
05-29-2009, 05:31 PM
I doubt it will affect performance, as the driver is 2inch from any side anyway... it's kinda "autobracing" ;)

Supergumby5000
05-29-2009, 05:34 PM
I would say non needed unless you wanna do the flush mount this which as mentioned above is **** ;)


But come one now your a civil engineer you can figure it out :laugh:

true, i guess i could've looked up the structural specs for MDF and calculated all the shear/normal stresses :laugh:

I dunno if i know how to convert sub excursion V. wattage into a force load though

James Bang
05-29-2009, 05:35 PM
I'd still double it up.

Supergumby5000
05-29-2009, 05:36 PM
I'd still double it up.

yeah the issue isnt a manner of me wanting to or not. I'de rather have double than single any day.


The issue is im trying to fit a large amount of woofage into a small area, where a double baffle would cause some issue ;)

James Bang
05-29-2009, 05:40 PM
yeah the issue isnt a manner of me wanting to or not. I'de rather have double than single any day.


The issue is im trying to fit a large amount of woofage into a small area, where a double baffle would cause some issue ;)

if another .75" is gonna cause a problem...

Supergumby5000
05-29-2009, 05:40 PM
if another .75" is gonna cause a problem...

actually, yes it is.

Xprime4
05-29-2009, 05:43 PM
I never did double baffle as space is always an issue for me. Brace alot around the subs. i can't see how 2inch x3/4 mdf could flex...

James Bang
05-29-2009, 05:45 PM
then have the extra baffle inside of the enclosure. w/o the cutout, the baffle will just have a displacement of .17cuft. after the cutout it would be much less.

Supergumby5000
05-29-2009, 05:46 PM
then have the extra baffle inside of the enclosure. w/o the cutout, the baffle will just have a displacement of .17cuft. after the cutout it would be much less.

cmon, if it was that simple, do you think i would have started this thread?

James Bang
05-29-2009, 05:49 PM
cmon, if it was that simple, do you think i would have started this thread?

ca.com

oldschoolboomer
05-29-2009, 05:49 PM
So do i.


However, that does not answer my question whatsoever

i thought it did. no you dont need a double baffle for such a small panel.

Supergumby5000
05-29-2009, 05:50 PM
ca.com

i guess thats true. There is an abundance of idiocy on these forums, but i like to think i am not included in that group :laugh:

Supergumby5000
05-29-2009, 05:50 PM
i thought it did. no you dont need a double baffle for such a small panel.

so you thought by telling me that you use a double baffle 90% of the time would signify to me that i dont need one?

James Bang
05-29-2009, 05:52 PM
I'm seeing it this way. you have a 20x20" baffle with a 16.75" diameter cutout. that leaves 3.25" on for sides between the cutout and the edge of the baffle. I see those 4 spots as weak spots. that's very little mass to support an 18" sub. that's just me.

Supergumby5000
05-29-2009, 05:54 PM
I'm seeing it this way. you have a 20x20" baffle with a 16.75" diameter cutout. that leaves 3.25" on for sides between the cutout and the edge of the baffle. I see those 4 spots as weak spots. that's very little mass to support an 18" sub. that's just me.

so in theory, you think the wood, because of its thickness, will practically shred itself?


would i see benefit from using another wood, say, 11 ply oak?

James Bang
05-29-2009, 05:57 PM
I'm saying that's a ***** baffle for an 18"

oldschoolboomer
05-29-2009, 05:57 PM
so you thought by telling me that you use a double baffle 90% of the time would signify to me that i dont need one?

i said i dont use double baffling 90% of the time. I guess I only implied that you dont need it. i will try to be more clear and direct with you from now on.

Supergumby5000
05-29-2009, 05:58 PM
i said i dont use double baffling 90% of the time. I guess I only implied that you dont need it. i will try to be more clear and direct with you from now on.

ahhh, i see now. Wording was kinda strange ;)

oldschoolboomer
05-29-2009, 06:01 PM
Box Construction

A strong box is essential in a high output system. Your box should be free from air leaks and braced internally if the volume exceeds 2 cuft. Internal cross bracing is far more effective in making a rigid box than doubling the wood thickness. Doubling the wood thickness adds a great deal of weight to your vehicle, and the added wall stiffness is less than stiffness added by cross bracing. Try to cross the braces at the same point so that they add strength to each other.

The inside seams of the enclosure can be a source of air leaks and potential weakness if the joints are not cut perfectly. One way to strengthen these joints is to use gluing cleats on the inside seams.

sqhertz
05-29-2009, 06:07 PM
if you are 100% sure that .75" will make that much of an issue , then brace.
if you can get another baffle in there , why not?

Supergumby5000
05-29-2009, 06:08 PM
if you are 100% sure that .75" will make that much of an issue , then brace.
if you can get another baffle in there , why not?

cant

sqhertz
05-29-2009, 06:09 PM
well , ****.

throw some braces in that **** and call it a day.

...?

sqhertz
05-29-2009, 06:10 PM
**** , maybe i missed it , but how heavy is this subwoofer? and will it be receiving gobs of power?