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  #1  
Old 08-31-2012, 04:22 AM
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Default Sub placement in new box.

I am doing a ported box for a single 12". I am designing it to fit behind my rear seat in my sedan. It's a sound quality setup for daily listening so I have been told that putting the port and speaker facing forward would probably be best for those goals. My question is can I put the speaker in the center of the box and the port and one end? Or should I put the speaker and port at opposite ends of the box? It will be 14 inches high, by 34 inches wide with a single slit port 2.25x 12.75 inches at one side of the box. The box will be tuned between 29-33hz so the port will open up to the inside the box near the opposite end of the box.

Tnx
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Old 08-31-2012, 09:00 PM
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you don't want them both forward, I am speaking in generalizations but usually you want both back in a trunk car.
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Old 08-31-2012, 10:42 PM
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If possible, put the sub as far away from the port opening (on the inside of the box) as possible. In most cases, this will be right next to the port opening on the exterior of the box. I agree with Korey in not going port/sub forward in a SQ setup.
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Old 08-31-2012, 11:00 PM
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What is the depth of the box. I only see height and width provided.

Also what kind of sub and what kind of power?
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Last edited by Colbyjack; 08-31-2012 at 11:41 PM. Reason: More info
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Old 08-31-2012, 11:19 PM
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I have a single 12" in a box dang near identical to yours tuned 35hz ive tried ever possible postion, sub/port forward will show more on the meter,an not as full sounding, sub/port towards back of car seems to "load" the subs, deeper, fuller sound..sombody correct me if im wrong, but i think it is called bass reflex...sub/port up does nothing but make your trunk an back deck scream bloody murder.....
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Old 08-31-2012, 11:39 PM
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I had a trunk setup with sub up and port to drivers side that sounded great. Lots of deadener on the rear deck and lid to keep from sounding like I had a jackhammer wide open in there though. Also had to remove the cyclops on the rear deck cause it was beatin on my back window really bad. My box was only about 10" tall thought vs yours thats 14", so I don't know if the additional space I had between the sub face and the rear deck made a difference in the SQ. I did try other orientations in that car, including sub up port to drivers side with a box about 15" tall, and none of them sounded as good, SQ wise, as the first one.
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Old 09-01-2012, 03:59 AM
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Oh lots of replies. It just now notified me of them.

The box is 36.5 wide by 14 high, and 11 deep on top with 14.5 depth of the bottom. Total volume is 1.82cu/ft after port and woofer subtractions. The port will be on one side and the rear port wall will extend horizontally in the box 27.25 inches with a 2.25 inch slit. This puts it 29.5" from one wall and 5 inches from the other for a tuning frequency of 34.74hz.

I wanted to minimize the shake in the trunk because in this old car, the ECU electronics is in the trunk and I don't have much extra cash right now to dump into a full deadening for the trunk. Also this car has a massive moonroof that is removable. Its about 4ft by 3ft. I am thinking with that open with sub/port facing forward will form a sort of band-pass with the interior of the car improving sound quality.

I did all my measurements and was planning to cut tomorrow, so there is still time to reconfigure my box if sub/port forward isn't gonna sound great.
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Old 09-01-2012, 06:21 AM
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Do anything BUT firing anything forward.
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Old 09-01-2012, 09:42 AM
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if you fire forward you will raise your resonant freq a great deal, so in other words you will be fighting the subwoofer in the low end freq, which is the job of a subwoofer in the first place. You will need a ton of deadener in any sq based car.
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