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View Full Version : Need help, series tuned bandpass



JBloud47
03-28-2009, 11:46 PM
This is just an idea I sketched up with my max outer dimensions, not totaly to scale. Idea is a series tuned bandpass usually used for blowthroughs, but was wondering if it could be addapded for wall type build with a loading wall. the image is how it would be built. Vehicle is a F-150 ext cab. Im going for low tuning around 30Hz and the subs depending on what would fit would be 4 RE SX 15's or 6 JBL GTO 15's
http://i231.photobucket.com/albums/ee202/jbloud47/4x15STbandpass.jpg
If somone could add some insight whether or not it would work and possibly a tooscale skectup would be great.

pr-festiva
03-28-2009, 11:50 PM
is that small chamber in front the part thats going to be ported in to the cab?

JBloud47
03-29-2009, 12:04 AM
the entire enclosure is in the cab, the chamber in front is more so a loading wall i guess. to picture it better think of it built exactly standing vertically inside the cabin of a F-150. but i guess yes thats what would be ported into the cabin but from the designs iv seen the entire mouth of the enclosure has been open.

pr-festiva
03-29-2009, 12:12 AM
im running a series 6th order right now 2.33 cubes ported to 36Hz and about 16 ported at about 64 hz and it works pretty well,,i would try a smaller rear chamber and a larger front chamber.

JBloud47
03-29-2009, 12:19 AM
thats what iv herd for 4th orders but for this series tuned type enclosure im cluless on hwo to tune it or what size encloseres to use for each chamber. due to the loading lactor of he subs firing at each other. 15's usual around 1.25-1.5 cudes per sealed and the fron chamber as big as u can mak it but the tuning is a ?

pr-festiva
03-29-2009, 12:23 AM
the low tuned chamber is going to be in the upper 20's or 30's and the front chamber is tuned from low 40's to 70's,, it depends on what you are going for,,, i need to tune both my chambers higher for more spl

JBloud47
03-29-2009, 12:40 AM
well im going for more of a daily driver low and loud. tryig to get good responce from mid 20s- 60s hz range. dont know how reasonable that is but lows is what im going for.

pr-festiva
03-29-2009, 12:58 AM
how much room do you have?

JBloud47
03-29-2009, 01:46 AM
dims are on the sketch. but its 46w x 38h x 21-23 deep roughly

pr-festiva
03-29-2009, 02:02 AM
inner or outer dimentions?

JBloud47
03-29-2009, 05:48 PM
those would be my outer dims

pr-festiva
03-29-2009, 05:54 PM
how thick you making the walls?

basshedz06
03-29-2009, 06:21 PM
If you want that range of freq I would try a really good built sealed box but the bp should be good too

JBloud47
03-29-2009, 07:04 PM
well prob single with alot of glass and threaded rod. but if done some more calcs and with the design like it is i dont think i have enough space for 4 15's since i think it acts more like a clamshell then a BP. with those mesurments i got a gross of 19.26 before any displacment. i might have to rethink what to do.

JBloud47
03-29-2009, 10:14 PM
i think i might bck up and just go with 2' 18 re Sx's ina 4th order bandpass. 2 cubes per for the sealed chamber. but that kind of tuning should i use for the front. as i said before its a daily driver so the scores on the TL dont realy matter just want to sound good a get low

dbeez
03-29-2009, 10:21 PM
Man if you could do 10 cubes tuned to 32hz some 18" nightshades would sound killer..And another option would be 6 cubes tuned to 32hz for 2 15" nightshades.. You gonna need room for amp and batteries..Also you have a pm

JBloud47
03-29-2009, 11:30 PM
no dout they would sound nice, just a little bit out of my bugget at the moment. i still have 2 Sx's so im just tring to work with those till i can upgrade down the road a bit. But u never know i got a year till i get my license back so i have plenty of time to work on the next set up.

dbeez
03-30-2009, 07:36 PM
The new Z15's would sound and they are reasonable...