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View Full Version : 4th order bandpass, opinions??



tez4life
07-19-2009, 11:39 PM
Still a work in progress, but here is the basic design,

http://i19.photobucket.com/albums/b183/tez4life/11111111111.png


Its intended for a pair of Sundown Audio Z15 15s. Specs are as follows,

4 cubic feet sealed section,
8 cubic feet ported section with a external port tuned to 45 to 48hz (still up in the air)

Subs will be inverted firing into the sealed section for better cooling.

Sounds good? Ive never designed a bandpass before, but I have to give props to G-Monk on here, he gave me alot of tips and pushed me in the right direction.

Looking for a low end monster, and a clean sounding daily. Any input with the design is apperciated thanks.

I almost forgot, going in a Crown Victoria trunk, firing through the rear deck.

dappa5
07-20-2009, 08:20 AM
Still a work in progress, but here is the basic design,

http://i19.photobucket.com/albums/b183/tez4life/11111111111.png


Its intended for a pair of Sundown Audio Z15 15s. Specs are as follows,

4 cubic feet sealed section,
8 cubic feet ported section with a external port tuned to 45 to 48hz (still up in the air)

Subs will be inverted firing into the sealed section for better cooling.

Sounds good? Ive never designed a bandpass before, but I have to give props to G-Monk on here, he gave me alot of tips and pushed me in the right direction.

Looking for a low end monster, and a clean sounding daily. Any input with the design is apperciated thanks.

I almost forgot, going in a Crown Victoria trunk, firing through the rear deck.


that is tooooooooo funny I put an almost IDENTICAL enclosure in a crown vic about 6 mo ago wonder is g monk has seen it lol nah j/k but the one i put in that crown vic was 5 ft^3 sealed firing into 8 ported externaly though rear deck
tuned to 48 made the rear and top pieces out of plexi looks bad azz
if you do it right you'll love it extreme low end w very little rattle from trunk
not for spl but great for daily ground pounding g/l
and yes i'll look 4 pics

dappa5
07-20-2009, 08:38 AM
found them http://i668.photobucket.com/albums/vv50/DAPPA5/DSC00730.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00731.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00728.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00729.jpg
good luck with yours like I said done right you'll love it

tez4life
07-20-2009, 08:39 AM
that is tooooooooo funny I put an almost IDENTICAL enclosure in a crown vic about 6 mo ago wonder is g monk has seen it lol nah j/k but the one i put in that crown vic was 5 ft^3 sealed firing into 8 ported externaly though rear deck
tuned to 48 made the rear and top pieces out of plexi looks bad azz
if you do it right you'll love it extreme low end w very little rattle from trunk
not for spl but great for daily ground pounding g/l
and yes i'll look 4 pics


Cool, thats really what im looking for, strong low end. SPL is not that important, car is not the best for that anyway, but wanted a nice sounding daily that drops very low.

tez4life
07-20-2009, 08:41 AM
found them http://i668.photobucket.com/albums/vv50/DAPPA5/DSC00730.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00731.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00728.jpghttp://i668.photobucket.com/albums/vv50/DAPPA5/DSC00729.jpg
good luck with yours like I said done right you'll love it



Very nice, :D At least im on the right track

wat
07-20-2009, 09:35 AM
****. this should turn out good

80INCHES
07-20-2009, 10:54 PM
make the sealed chamber 3 cubes and the ported 9cubes
by doing that u will be able to make the port slightly bigger and maintain the 45hz tuning...

80

tez4life
08-08-2009, 02:19 PM
make the sealed chamber 3 cubes and the ported 9cubes
by doing that u will be able to make the port slightly bigger and maintain the 45hz tuning...

80

Thanks for the input 80, forgot to respond to this thread lol.

80INCHES
08-08-2009, 02:25 PM
lol i didnt even see it until that day i posted

but it should come out nice

80

tez4life
08-08-2009, 02:31 PM
Only thing now is I may change subs, im currently running a single DC LVL4 18 ported in 5.5 @ 32hz and im digging the subs, I might use a pair of LVL4 15s instead of the Sundowns.

dappa5
08-08-2009, 02:31 PM
dont for get pics /build log

tez4life
08-08-2009, 02:35 PM
dont for get pics /build log


Of course :D, if I can ever get this project off the ground. Thanks for the info too, wish I could just bring the car to you, how long would a install like this typical take?

dappa5
08-08-2009, 02:41 PM
a day

GearGuy2001
08-08-2009, 03:50 PM
Looks sick, youll have to build a false floor on the bottom of the trunk cause Im pretty sure the crown vic like my grand marquis has a slant on the bottom.

80 helped me design a box for 1 alphamax 15 but I ended up doing 2 ported so my winter project is to do 2 4th order bandpassed

like 4 cubes sealed and 9 cubes ported at 45hz, with 3-4 6" aero's through the rear deck.

dappa5
08-08-2009, 03:54 PM
Looks sick, youll have to build a false floor on the bottom of the trunk cause Im pretty sure the crown vic like my grand marquis has a slant on the bottom.

80 helped me design a box for 1 alphamax 15 but I ended up doing 2 ported so my winter project is to do 2 4th order bandpassed

like 4 cubes sealed and 9 cubes ported at 45hz, with 3-4 6" aero's through the rear deck.


yeah if you use a 2x4 at rear it will level it out nice

GearGuy2001
08-08-2009, 03:58 PM
yeah if you use a 2x4 at rear it will level it out nice

Awesome, I wasn't sure on the difference of the back, I'm guessing a 2x4 as in 2" tall and 4" deep?

Im pumped to try a bandpass cause the ported I just built is nasty low and the subs are all the way broken in yet nor on nearly enough power.

tez4life
08-08-2009, 03:59 PM
Looks sick, youll have to build a false floor on the bottom of the trunk cause Im pretty sure the crown vic like my grand marquis has a slant on the bottom.

80 helped me design a box for 1 alphamax 15 but I ended up doing 2 ported so my winter project is to do 2 4th order bandpassed

like 4 cubes sealed and 9 cubes ported at 45hz, with 3-4 6" aero's through the rear deck.



Cool, you read my mind, hate how the trunk slopes like that in the car.


yeah if you use a 2x4 at rear it will level it out nice

Thanks for the info, :)

tez4life
08-08-2009, 04:14 PM
Awesome, I wasn't sure on the difference of the back, I'm guessing a 2x4 as in 2" tall and 4" deep?

Im pumped to try a bandpass cause the ported I just built is nasty low and the subs are all the way broken in yet nor on nearly enough power.



I was going to ask you on your thread, how does your new setup sound?

Me&MyVic
08-08-2009, 04:57 PM
Tez the design looks good. I wanna try a 4th Order & with the HDC3 18s on sale now would a 4th Order even be possible with two of these in a vic trunk. Who would wanna design this? I dont care about trunk space at all, I hardly have any anyways.

dappa5
08-08-2009, 05:28 PM
two 18's would fit but getting all required air might be tight but may just be worth trying lmk if you do
hit up 80 see what he thinks

GearGuy2001
08-08-2009, 08:16 PM
two 18's would fit but getting all required air might be tight but may just be worth trying lmk if you do
hit up 80 see what he thinks

I bet with some fiberglass work and using aero's vs slot port you could get close.

80INCHES
08-08-2009, 10:02 PM
dont do it if u dont mind using ALL of ur trunk space

80

GearGuy2001
08-08-2009, 10:21 PM
dont do it if u dont mind using ALL of ur trunk space

80

So do it!!! lol

Trunks are over rated, they hold my subs and amps, thats it.