PDA

View Full Version : 2 FI BL 12's.... NEED BOX HELP!!!!!



RJ Matzke
07-15-2011, 10:00 PM
Going on a IA mono 20.1

2 FI BL 12"s

slot, square port.

flush mounted.

what size port and box? - i though around a 6" wide port and 7 cubes

should i double baffle and triple baffle the sub mounting side?
or
is is bracing all i need?
if so...
what type of bracing?

max dimensions are (this is including the space i need for 3/4 mdf [take into mind the baffeling as it subtracts from the numbers even more]):

width (driver side to pass side) - 40
depth (ground to roof) - 23
length (headlights to tail lights) - 20

RAM_Designs
07-15-2011, 10:31 PM
If you plan on giving them their RMS wattage, stick to 2.25ft^3 each with a tuning in the lower 30's. Overall volume before sub and port displacements will be about 6ft^3. You may or may not have to double up the mounting baffle, just depends on how you have everything laid out.

jrouter76
07-15-2011, 11:28 PM
how well do those BLs sound in the proper box ported as the OP stated ?

Kangaroux
07-15-2011, 11:29 PM
how well do those BLs sound in the proper box ported as the OP stated ?

You're asking a very generic question lol.

RJ Matzke
07-16-2011, 01:24 AM
thanks man

RJ Matzke
07-16-2011, 01:25 AM
lol agreed... but i already drew it up on sketchup... gunna build it tomorrow... well see how it sounds

RJ Matzke
07-16-2011, 01:31 AM
i put them in 7 cubes at 36 Hz. 6" wide port, triple baffled the mounting layer and doubled all the rest. its going to be a heavy ***** but solid. im going to skip on bracing because oh how my joints are set up. i think i will be fine with wood glue, pressure and a finish nailer. pm me your number and ill send you pics as i build it.

surreal
07-19-2011, 04:21 AM
You put two strong 12s in a 7 cube box? Ripple city. Gonna sound like ish and be super boomy with an awful low end peak.

RAM_Designs
07-19-2011, 11:30 AM
You put two strong 12s in a 7 cube box? Ripple city. Gonna sound like ish and be super boomy with an awful low end peak.

This. I personally wouldn't go over 4ft^3 for a pair. The thing that ***** about these low Q and Vas woofers is the need for a smaller box and a lot of power to get a decent response curve out of them while keeping output high. Granted, most people aren't looking for a smooth response if they're getting these kinds of subs.

Buck
07-19-2011, 11:32 AM
4.5 cubes tuned to 30 hz with about 60 square inches of port.