fiberglassing inside of boxes

[mlstrass 5,000+ posts]

I want to know what 2.5^3 enclosure design you have that will have a flex issue? What sub and how much power?

Unless it's some oddball desing a couple of well placed strap braces should be all you need. If it's a 50# sub then double baffle...

For a daily set up resin is a waste, if your chasing tenths on the meter then consider it....

 

[phemps 10+ year member]

well the 2.5 cube enclosure is just temporary until i get a second hdc3 and i want to just try something that i can transfer over to the dual 12 box which will be around 5 cubes. and without bracing will most definately flex considering i had 2 shitty mtx subs flexin the hell out of a 4.3 cube box i had tuned to 32 hz. the box was nicely constructed too edges matched up nice qand everything was sealed good but top and front baffle flexed bad

 

[mlstrass 5,000+ posts]

why so big for the 2 12's? You low on power? I've stuck with 4cubes NET on all the HDC boxes I've built as most guys are running around 2k per sub...

 

[fbi90909 5,000+ posts]

Don't bother using fiberglass to brace a box.

Why? Fiberglasses strongest points are when the surface is curved. In a flat surface fiberglass will flex quite easily. You would need layers on layers on

layers of glass on a flat surface to get it rigid enough to not flex.

Save you money. Go to home depot and buy dowels. Cut them to lenght to fit wall to wall inside your box. Glue them inplace and run screws thru them. Or buy threaded rods and nuts and washers and brace it that way. Either of the 2 will reduce much more flex than fiberglassing will.

 

[phemps 10+ year member]

why so big for the 2 12's? You low on power? I've stuck with 4cubes NET on all the HDC boxes I've built as most guys are running around 2k per sub...

ill be very low on power for the single aq only 1000 rms for a little while. but as for the dual box down the road i was just giving a rough estimate. it would prob be closer to 4 cubes. aq is very vague wiwth there specs. it says the twelves like 2.5 but you dont have to factor in any displacement. so i meant something along the lines of 2.5 without subtracting driver and port displacements

 

[ngsm13 5,000+ posts]

Wow.

nG

 

[thegreatestpenn 5,000+ posts]

you don't need fiberglass with what you are using. don't waste your time with that.

also I have a box for when you go with 2 hdc3's sitting in my basement. if you're not far from columbus OH you can come get it for a decent price.

 

[snb778 5,000+ posts]

IF............ you choose to glass it... you should test it before glass and after to see if it does anything for you in the future

i still gotta try this vaccum test to see if MDF really leaks air