View Full Version : need a fart box design

09-01-2007, 03:08 PM
looking for a design
for 2 memphis PR12's
max dimentions: 20 deep, 18 tall, 40 wide
vas:2.16 cf
mms:136 grams
xmech:.352 in
sensitivity:88 dB
coil diameter:2 in
coil config: single 4
2 drivers
250w each
im looking for purely SPL
total fart box
around 50 Hz or whatever will get me the most output
honestly, i'd rather not pay for the design, im broke enough as it is
i would usualy do it my self but i dont have the time right now and ive never built a purely spl box
all i really need is airspace, port area/length, and orientation

09-01-2007, 03:10 PM
actually, im less looking for a straight up design as i am looking for suggestions and opinions concerning size and tuning/ orientation
its going in a jeep cherokee

09-01-2007, 03:20 PM
put paypal ready in your title and u'll have more than enough ppl wanting to help ;)

09-01-2007, 03:21 PM
thats the thing, im ****ing broke, hahahaha

09-01-2007, 03:28 PM
Do a CRX style box...subs up port back.....put each sub in a 1.5 cu ft chamber counting port and basket displacement...use 2 5" ports per chamber...PVC or aeros even better if broke make your own....make each port length about....16" long.....You should be set....:)

09-01-2007, 03:32 PM
thanks alot
now, port back, this is in the trunk space of a jeep, so.... should i but the back seat down?

09-01-2007, 03:38 PM
i didnt even pay attention, i thot u sed port forward
thnaks alot man

09-01-2007, 03:42 PM
Try to fit the box so the port is about 7" from the rear hatch ....Have subs firing up as close to the rear seat as possible......The box will probally be sorta shallow...make sure you have at least 2" below the magnet so the subs can breath...If you share chamber....with subs...I would...put the ports fairly close to each other side by side ...and have them opposite of where your vehicle meters best from.....For instance...you meter best on passenger side...have the two ports on the drivers side of the box towards the rear.....Hope this helps :)

09-01-2007, 03:48 PM
thanks bro
very helpful
i owe ya one
barely missed 3rd place last night and i intend to take atleast 3rd at battle of the highschools later this month