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Rawr-DQ
03-27-2005, 12:39 AM
Okay, I used bassbox pro 6, and doing my best to fit a 6 cube box into a small a** trunk, this is what I came up with:

The subwoofers (4)
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Driver Properties
Name: SWR-1241D
Type: Standard one-way driver
Company: Alpine
Comment: Type-R series
No. of Drivers = 4
Mounting = Standard
Wiring = Parallel
Dual voice coils = parallel
Fs = 28 Hz
Qms = 8.31
Vas = 58 liters
Xmax = 13.87 mm
Sd = 467.6 sq.cm
Qes = 0.45
Re = 1.8 ohms
Le = 0.67 mH
Z = 2 ohms
Pe = 300 watts
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The Box:
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Box Properties
Type: Vented Box
Shape: Prism, square
Vb = 5.954 cu.ft
Fb = 28 Hz
QL = 6.536
F3 = 31.82 Hz
Fill = none
No. of Vents = 1
Vent shape = rectangle
Vent ends = one flush
Hv = 24.5 in
Wv = 1.825 in
Lv = 24.5 in
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The design:
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http://memimage.cardomain.net/member_images/12/web/804000-804999/804181_46_full.jpg
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I would show you the graphs the program produced, but it is too much of a hassle, anyways there you have it! :D

SPL140.2
03-27-2005, 12:48 AM
i dont think your port is wide enough. should go with a wider port.

Rawr-DQ
03-27-2005, 12:54 AM
it's 24.5"x1.825", tuned to 28Hz, the box at 31.82Hz, the graphs it gave me, I did my best to get a good flat response with the limited air space...I'll look into making the vent wider

Rawr-DQ
03-27-2005, 01:04 AM
The highest I can go is "2.82" is the largest I can get without shrinking the area of the vent opening inside the box below 2.82

Fb = 28.85Hz

Moe Lester
03-27-2005, 01:10 AM
24.5 x 1.825 is way too skinny, 24.5 x 2.82 is still too skinny.

have you thought of using aeroports?

Rawr-DQ
03-27-2005, 01:34 AM
I'm was going for simplicity

Rawr-DQ
03-27-2005, 01:45 AM
Well, I looked into mounting the vent elsewhere, and came up with this:

old:
Hv = 24.5 in
Wv = 1.825 in
Lv = 24.5 in
@28Hz

F3 = 31.82 Hz

new:
Hv = 5.25 in
Wv = 5.25 in
Lv = 10.25 in
@29.14Hz

F3 = 31.49 Hz

The vent will be mounted facing the same direction of all the drivers (unlike last time where it was mounted on the side) in the top right-hand corner in the picture.

SPL140.2
03-27-2005, 05:05 PM
I still think you should make the port a lot bigger especially if your using all 4 subs. the width 5.5" is alright but id go with a higher port also.

DBfan187
03-27-2005, 05:23 PM
needs a LOT more port area

PV Audio
03-27-2005, 05:26 PM
i'd say more port, thats tuned a lil low also imo.

Rawr-DQ
03-27-2005, 07:56 PM
tuned low for SQ, but around 32Hz, still good!

Not going comp and blowing out my windows here..

if I make the ports any bigger, the length will be too long and will go straigt through the box...I'll see what I can do...thanks for the help!