hey there. i have been struggling for a week now trying to decide on an enclosure.
i have (2) rockford 12" t212d2 subs (http://www.rockfordfosgate.com/products/product_details.asp?item_id=91849&locale=en_us) (i am running a bd constant power 1500.1 @ 2ohm amp)
specs call for a 2.0cu ft. box for each sub (min 1.5- max 2.5)
a powerful enclosure calls for 2.2cu ft. with an L shaped port.

my question is:
i cant find a 2.0cu ft box for sub. should i get a box that is 1.75cu ft vented for each sub? or a 1.9cu ft/sub or a 2.5cuft/sub box? (all boxs are ported/vented)
also, does the tuned HZ of the box matter that much? my subs call for 40hz, but if i get a 34hz box is it guna matter as much?
what is the best for the subs? a bit above, or a bit below spec? which ports are best? L shaped, labyrinth?
does it matter much if my subs share the same airspace/port? or should they have their own chambers?

THANKS A TON

 

i am thinking this box:
TWO 12" inch DUAL SUBWOOFER SUB BOX ENCLOSURE VENTED - eBay (item 220680325522 end time Apr-06-11 07:51:59 PDT)
its 1.75cuft/chamber with a labyrinth port tuned at 38hz

or this one:
SUB BOX 12" Vented Dual B Box Transmission #E12DTV - eBay (item 310301364246 end time Apr-03-11 15:58:01 PDT)
1.9cu ft/chamber. not sure what its tuned at

this is 1.95/sub
DUAL 12" PORTED 3/4MDF SUBWOOFER SPEAKER ENCLOSURE BOX - eBay (item 270706353063 end time Mar-15-11 20:00:22 PDT)
but its tuned at 34hz

this one is 1.93/sub
SUBZERO NEW DUAL 12" CAR SUB WOOFER BOX ENCLOSURE 2011 - eBay (item 160367876555 end time Mar-30-11 18:12:21 PDT)
tuned at 37hz but only 5/8 mdf board

1.8/sub
DUAL 12 INCH VENTED SUB BOX PORTED SUBWOOFER 40" PORT! - eBay (item 330536723203 end time Mar-30-11 17:38:57 PDT)
not sure what its tuned at

2.5/sub
PAINTABLE CUSTOM DUAL VENT 12" SUBWOOFER PORTED SUB BOX - eBay (item 230587016475 end time Mar-18-11 16:59:48 PDT)
not sure tuned at


any help is great appreciated

 

download winisd, input the data sheet specs.....buy a $30.00 sheet of 1" mdf, build the box.......after screws, glue and what not and an hr or 2 of time....you'll have a box ON spec!!

 

anyone know where please?
I am in Grimsby, ON

 

couldnt tell ya....im in bc.....but it u can get 3/4 " mdf, use that, double the baffle board where the sub goes, and use internal bracing......done deal!!

 

The HD on Centennial Pkwy in the hammer has 1"MDF....sometimes....

WinISD is available here.

If you need a hand PM me.

HTH

 

Thanks Red.

I will check there.

If using 3/4" MDF, should I double it in baffle area (will be internally braced....one 10" Image Dynamics IDQ, new, sealed box...).

I appreciate your kind offer of help.

 

rona home depot and lowes typically have 3/4" mdf . you wont "need" to internally brace that 10"idq but wont hurt it! just a little more work for you and calculations to get the correct volume

 

Either build a box yourself or have a custom built box made...they're about the same price as a good prefab box, and will be properly matched to your subs. Tuning is based on your preference, the sub's needs, and the vehicle's acoustics. Ports can be any shape, but the volume needs to be in a certain range to prevent port noise. It doesn't matter if the subs are in a common chamber.

 

Had a lot of fun.

3/4" MDF from Home Depot (24X48" was $10.49)
Baffl;e thickness doubled
1 1/2" spruce braces (X4) inside
wood glue
silicone sealant
#8 wood screws 2" (pre-drilled)

Spray primer on inside
and outside, then few coats of black spray paint,
followed by fibreglass (polyester) resin, two coats

then sprayed it with Dupli-color spray

let it dry (silicone) four days

and popped my baby in!

Volume is 0.98cu ft exactly.

I added a very small amount of poly-fill (about the volume of a loaf of bread, spray glued to three adjacent walls...so thinly...probably a waste...)

MY QUESTION IS.....please....

Audison amp supplying 340 watts rms (sub RMS 350 W)

Sounds good, but maybe too much down low...idk?
The sub is supposed to have a "musicality" to it....would it be better to slightly reduce the effective internal volume of the box (take out small amount of polyfill and add extra braces inside, for a volume of 0.92....or would that small change not make much a difference to the "musicality" factor.

TIA.

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