hello people, yesterday i built a large mdf box to suit 2 15" fusion powerplant speakers both are recieving around 400wrms each
the box is 110L give or take 2L
It sounds bassy as hell, but very very distorted, hopped out of my car to find that the box is flexing through each bass hit.
Now the box has a centre barrier so it is 2 seperate chambers, and i have used silicon to properly seal each chamber off from the other. the mdf is 18mm thick all around. I have also used metal brackets to bolt the box together, the box is pretty strong..obvisouly not strong enough though.
now i built this box to fit exactly into the boot behind my seat and above parcel shelf, so everything is spot on, which unfortunately does not leave much room to brace it from the outside (which i believe needs to be done)
What i was thinking of doing was covering the whole box in fibreglass and the parts where there is not enough room for anything bigger than what the box already is, just using resin
will this strengthen the box if i only use 1 layer (which is all i can really afford due to lack of workable space around the box)
what other options do i have to stop the box from flexing?
thanks in advance
Take the subs out the box and try to brace it as much as possible.
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~The Rookie~
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Don't let the smoke out of your equiptment..it doesn't go back in.
Iam assuming 18mm is as close to 3/4 inch mdf as you can get. As for strengthening, fiberglass may make it a little stronger but it won't prevent flexing. To get rid of flex you need braces.
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brace the box from the inside a great site that will show you different ways and how to brace your box is the
JL Audio siteive strengthened it up and the box no longer flexes but the distortion remains.
i have the subwoofers sitting straight up and they are sitting below my parcel shelf, theres a clearance of about an inch and a half, is this good or bad? btw its metal
dangerranger96 wrote:
brace the box from the inside a great site that will show you different ways and how to brace your box is the JL Audio site
Id have to say that's one of the best sites for info, good choice!! :-D
ok seems to be sounding alot better now, just seems to be droning alot :( results of a box thats too big??
i used 1" wood dowels rods screwed in from the outer side of the box and fiberglassed on the inside..otherwise if space is a issue ...i know quite a few people that use threaded rod as bracing for their boxes and it works good also
even though you might think that the box is not flexing anymore, it could still be flexing make sure it is braced well enough to with a 20 pound bowling ball being dropped on it, it really does need a lot of strength