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  #1  
Old 11-05-2010, 01:09 AM
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Default need box help for 2 Sundown sa8's!!!

running about 5-600 rms to each. i know they call for .5 cubes per. want the box tuned to 33ish hz. want to try aero's. need help ASAP!

box dimensions(estimate)

23" wide x 10" high x 12" deep
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  #2  
Old 11-05-2010, 01:30 AM
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with those measurements you are sitting at around 1.18 cubes with minimal sub displacement(.007 cubes) but it wouldnt hurt to have one 2x4 through the center. that would put you at 1.15 net cubes and using two two inch flared aeros found here Precision Port 2" Flared Port Tube Kit | Parts-Express.com

you would be tuned to 33 hz with the total port length being 13.06 inches included flared ends
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Old 11-05-2010, 01:36 AM
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so forgive my lack of knowledge and stupid questions but if i need 13" total port length running 2x2" aeros i would just make each one 6.5" long
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Old 11-05-2010, 01:39 AM
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No, on the site of precision ports you enter diameter and the tuning freq net volume and number of ports. each port would be 13.06" just measure the total length then take off whatever you need from the middle section to reach your desired 1"
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Truck-Ford ranger extended cab
HU-kenwood kdc-x794
Front stage-3.5" infinity coax, infinity tweets, 4 goldwood 6.5's & 4 blaupunkt tweets
Front stage amp-2 Alpine 3527/alpine t220 for kick panel
Rear stage-Infinity 5x7's
Sub stage-4 10" wmd's
Box-6 cubes tuned to 32hz
Amp-Md-3D strapping a second when the $ comes
Batts-Deka 9a31/yellow top d31/yellow top d51/duralast gold starting batt up front
Big three done in 2/0ga the rest in 1/0
Alt-Db 250 amp(coming)
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Old 11-05-2010, 01:45 AM
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ive been using the12volt box calculator and it makes no sense to me now. first entered the box size to get my internal volume, then entered the diameter of the aero ports i was thinking of using then adjusting numbers to get the desired tuning...is this not accurate
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Old 11-05-2010, 02:12 AM
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go here-http://www.psp-inc.com/tools.html

and play around if you use the given dimensions and use one 2x4 for bracing and the subs combined volume you have a net volume of 1.14 cubic feet assuming the way the box is put together by starting with the bottom, back,sides(on top of the bottom board), then front, and lastly top.

scratch everything i previously said you can do one 6" at 10.49" or one 4" at 7.1" or 2 2" at 13" I'd go the one 6" route
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Truck-Ford ranger extended cab
HU-kenwood kdc-x794
Front stage-3.5" infinity coax, infinity tweets, 4 goldwood 6.5's & 4 blaupunkt tweets
Front stage amp-2 Alpine 3527/alpine t220 for kick panel
Rear stage-Infinity 5x7's
Sub stage-4 10" wmd's
Box-6 cubes tuned to 32hz
Amp-Md-3D strapping a second when the $ comes
Batts-Deka 9a31/yellow top d31/yellow top d51/duralast gold starting batt up front
Big three done in 2/0ga the rest in 1/0
Alt-Db 250 amp(coming)
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  #7  
Old 11-05-2010, 03:04 AM
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Quote:
Originally Posted by Bunkrd you4 View Post
go here-http://www.psp-inc.com/tools.html

and play around if you use the given dimensions and use one 2x4 for bracing and the subs combined volume you have a net volume of 1.14 cubic feet assuming the way the box is put together by starting with the bottom, back,sides(on top of the bottom board), then front, and lastly top.

scratch everything i previously said you can do one 6" at 10.49" or one 4" at 7.1" or 2 2" at 13" I'd go the one 6" route
Wow. This is way off.

First off, bracing is a good idea, but you certainly don't need a 2x4. I wouldn't bother bracing a 1cf box, but that's up to you. If you do, a 1" dowel rod will be plenty.

Secondly, a 10.5" x 6" aero will put you @ like 67hz. And unless you own a CRX and it's a straight burp box, this isn't a good tune. A single 6" Aero would need to be 55" long to get you to 33hz. Lol. One 4" aero would be perfect for your application but it's still going to need be 24" long to get you to 33hz. I don't like using tubes that long, besides the fact that it would never fit in a 1.2cf box. I would look at doing an "L" shaped slot port. Make it about 12 sq in of port and 22" long.

Completely throw out the 2" port idea. Aeros aren't that great for small boxes in my experience because they end up being too long. I had this same problem a few days ago when I put together a little box for a single 12. I wanted to use Aeros I had laying around, but the lengths just don't work out well. Any decent street tune in smaller boxes is going to be 20"+ and that kind of length is just a headache.

If you are dead set on using an Aero, you can probably get away with a single 3". It's not quite as much port area as I would like to see you use, but it's close. And a length of ~ 13.5" will get you to 33hz.
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Last edited by TaylorFade; 11-05-2010 at 03:16 AM.
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Old 11-05-2010, 03:16 AM
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yeah i know i corrected my self in a pm. I flipped something around when tuning. and I just said a 2x4 because they are readily available. still dont take up much room.
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Truck-Ford ranger extended cab
HU-kenwood kdc-x794
Front stage-3.5" infinity coax, infinity tweets, 4 goldwood 6.5's & 4 blaupunkt tweets
Front stage amp-2 Alpine 3527/alpine t220 for kick panel
Rear stage-Infinity 5x7's
Sub stage-4 10" wmd's
Box-6 cubes tuned to 32hz
Amp-Md-3D strapping a second when the $ comes
Batts-Deka 9a31/yellow top d31/yellow top d51/duralast gold starting batt up front
Big three done in 2/0ga the rest in 1/0
Alt-Db 250 amp(coming)
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Old 11-05-2010, 03:24 AM
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Quote:
Originally Posted by Bunkrd you4 View Post
yeah i know i corrected my self in a pm. I flipped something around when tuning. and I just said a 2x4 because they are readily available. still dont take up much room.
I'm glad you helped the OP via Pm, but just in case someone else stumbles across this thread, it needed to be corrected.

If he has a 2x4 laying around, that's great, but 1" dowels are like $1. But, like I said, I wouldn't even bother bracing a box that small. A 2x4 also causes way too much turbulence inside of a box. I only ever see 2x4's being utilized in the biggest of builds.
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Old 11-05-2010, 07:54 AM
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@taylor, im not at all knocking ur suggestions, but from what ive seen and heard about the sa8's, they need an obscene amount of port area for an eight. jacob has chimed on the subject as well. most i talked to when i was going to make a box for an sa8, said i should use a 4" port rather than a 3"; that being just for 1 8". i agree with the slot port idea if it cant be done. seems a little easier with the little boxes. OP if you can't get the numbers to work out perfect, contact ami or some similar and see if they can run the numbers to see how it can get it done. hope it helped
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