sub box starting to come apart

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bumpinexploder

Copper - Posts: 265

Joined: February 06, 2008

Location: Texas, United States

Posted: May 30, 2008 at 10:29 PM / IP Logged

i have a custom tuned 40 htz box for 4 cvrs that i bought from a guy. well the box sounds awesome but im runnin 1300 rms to the box and it cant take it. its starting to crack the wood glue and the screws are popping out. how should i resupport this? 2x3's? also how many internal braces should i use and what adhesive, liquid nail? the dimmensions are 59 wide 19 tall and 17 deep

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: May 30, 2008 at 10:56 PM / IP Logged

Sounds like it was very poorly constructed and not properly braced. You might be able to save it with external bracing, and re-seal the seams using silicone caulk. Is it made from 3/4" MDF?

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bumpinexploder

Copper - Posts: 265

Joined: February 06, 2008

Location: Texas, United States

Posted: May 30, 2008 at 11:05 PM / IP Logged

yes it is made from 3/4. it sounded awesome when i only put 3oo watts to it but i got a new jifonics amp and it is not made for high power i guess. the guy that sold it to me competed in the low watt class. how do i do external bracing? i was gonna put maybe 2x3's on the seams and like 1 or 2 going across the box. is silicone the best application for the seams? and will it work with wood glue already in there?

Pioneer DEH-400UB

Kicker 150.2 mids/highs amp

MB Quart fsa 216 front stage

AudioPipe gd-6001 mono amp

AUDIOQUE SD 15S PREFAB BOX!

C&D Technologies Battery, 1500 CCA, 134 amp storage

149.5 DB's

aznboi3644

Gold - Posts: 2,600

This member consistently provides reliable information

Joined: May 01, 2006

Location: United States

Posted: May 31, 2008 at 1:28 AM / IP Logged

sounds like a very poorly constructed enclosure...you can try gluing 2x2's along the inner seams along with clamps to help bond the joints together...I'd try using dowel rod for inner bracing though

bumpinexploder

Copper - Posts: 265

Joined: February 06, 2008

Location: Texas, United States

Posted: May 31, 2008 at 11:23 AM / IP Logged

wat is dowel rod?

Pioneer DEH-400UB

Kicker 150.2 mids/highs amp

MB Quart fsa 216 front stage

AudioPipe gd-6001 mono amp

AUDIOQUE SD 15S PREFAB BOX!

C&D Technologies Battery, 1500 CCA, 134 amp storage

149.5 DB's

bumpinexploder

Copper - Posts: 265

Joined: February 06, 2008

Location: Texas, United States

Posted: June 01, 2008 at 5:09 PM / IP Logged

well today i redid the box. i used 2 2x4s to go across the inside of the box and used a couple 1x4s to help support the seams. and then i used silicone on most the joints. also i put a 1x1 peice on where the port is because its just one 3/4 board. so i helped it out. that wont make any port noise will it? thanks for everyones input. i hope this mod hjelps out and keeps it strong. also will sprayin it with that bedliner stuff make it hold together any better? its not covered at al right now.

Pioneer DEH-400UB

Kicker 150.2 mids/highs amp

MB Quart fsa 216 front stage

AudioPipe gd-6001 mono amp

AUDIOQUE SD 15S PREFAB BOX!

C&D Technologies Battery, 1500 CCA, 134 amp storage

149.5 DB's

aznboi3644

Gold - Posts: 2,600

Joined: May 01, 2006

Location: United States

Posted: June 01, 2008 at 6:06 PM / IP Logged

lol bedliner will do nothing for structural rigidity

big sexy lac

Copper - Posts: 153

Joined: November 01, 2007

Location: Illinois, United States

Posted: June 02, 2008 at 10:14 PM / IP Logged

If the box wasn't covered why didn't you just take it apart measure each panel and duplicate the box with 1in mdf.since you like the way it sounds.

well?

daboss593

Copper - Posts: 154

Joined: March 29, 2008

Location: Florida, United States

Posted: June 03, 2008 at 7:33 AM / IP Logged

i had a custom made box made. and before the carpet was on i checked it out. not everyone takes pride in their work. next time you have a box made check it out before they carpet it. and if you dont know what to look for ask in these forums etc.

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Big Dog

Gold - Posts: 1,265

Joined: May 02, 2002

Location: Quebec, Canada

Posted: June 03, 2008 at 8:19 AM / IP Logged

Construction adhesive works great. Sold in caulking type tubes at most hardware stores.

For mega watt systems I use double wall constuction with overlapping joints. If your box is still quite solid, you can build a box outside of your box.

Don't forget that internal bracing is great but reduce it from the box volume calculation for correct tuning.

Prepare your future. It wasn't the lack of stones that killed the stone age.

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