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View Full Version : Need help porting 4 Sundown E8's



David12460
12-15-2008, 10:21 PM
If anyone has some free time and would like to help me with designing a enclosure I would be greatful. I struggle designing ported enclosures.

I have 4 Sundown E8's on the way and want to build a ported enclosure tuned roughly to 30hz.

This will be going in a ext cab S10. I would like it to stretch the length on the cab.

Size to work with: These sizes can be modified to be less but no more. These are the max dimensions I am willing to give up.

45'' Wide
12'' High
15'' Deep

Here are the specs

PARAMETERS AND BOX SPECS:

Re = 3.37 ohms (4 ohm nominal)
Fs = 34.9 hz
Qes = 0.5323
Qms = 6.93
Qts = 0.4943
Vas = 7.6 L
BL = 13.3 N/A
Mms = 127.7 grams
Cms = 162 um/N
Xmax = 12mm one-way linear (70% BL method)
Rated RMS Power = 200 watts
Depth = 4.25"
OD w/ gasket = 8 5/16"
Cut Out = 7"

Sealed Box:
0.280 ft^3 w/ F3 of 50 Hz (Qtc = 0.707)

Ported Box:
0.60 ft^3 tuned to 30 Hz
F3 of 25 Hz


Thanks :D

David12460
12-16-2008, 08:52 PM
Bump

Paul73
12-16-2008, 09:19 PM
http://i84.photobucket.com/albums/k20/855Turbo/box.jpg

David12460
12-16-2008, 09:22 PM
Ive used that before. As long as my volume and tuning fall into spec will I be good? I know there is more to it.

Paul73
12-16-2008, 09:34 PM
Ive used that before. As long as my volume and tuning fall into spec will I be good? I know there is more to it.

I've heard others say that it isn't accurate as far as tuning freq. is concerned but I haven't found that to be the case and I've used it for at least 5 box designs.
As far as more to it, yeah there is a lot more to it. Most manufacturers suggested box volumes are just that, suggestions. They are usually some sort of compromise (as any design is really) that they feel will model well in most cars. Knowing your transfer function and what your goals are for the setup would determine a more exact design.

David12460
12-17-2008, 06:30 PM
ok. Well if I find the correct dimensions of my liking and make it tuned to 30 hertz I should be good?

I know they recomend 30 hertz for tuning, but does that seam a bit low? most subs I have dealt with has been around 32 hertz.