Dodge Magnum build, need advice on port distance to rear hatch. - Car Audio Classifieds!
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Old 07-04-2016, 01:20 AM
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Default Dodge Magnum build, need advice on port distance to rear hatch.

So I'm building a box for a buddy of mine's Dodge Magnum. He has two Kicker Solo Barric L7 15's, power will be 1600-2000 true rms watts. I was conflicted with which type of box to build (aero or slot) and came up with the best way to hit 32-33hz within the space he has while giving the subs enough port area to play in. The best scenario I came up with was a subs up, port back box with a virtical slot port in the middle. (If anyone has a better suggestion feel free to tell me) it will be roughly 4cubes per sub after displacement and about 13 and a half cubic inches of port are per cube. (I know cubic iches per cubic foot is not the best way to build a box but my computer is down so im using an app on my phone that gets it within kicker reccommendation.) Now id like to heep the box low and if i can extend it closer to the rear hatch that would be great. So far my port is 6" wide and 16.5" tall and aroud 6" from the back hatch. How much area does the port need to be away drom the rear hatch to work properly? Is it best to do subs back port back? Any other special attention i need to consider for a magnum build? Thanks in advance.
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Old 07-04-2016, 04:02 AM
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I've seen 5-6" usually, sometimes it differs. Depends on how tall the box is as well. I've done as little as 10 in^2 per cube on L7 15 and actually built the box and it was very loud. It was 10 cubes net @ 33 hz with a 10 x 10 port, lol. If you run out of space, you can always fire the port upwards, pushed all the way to the rear of the vehicle.
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Old 07-04-2016, 04:19 AM
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Quote:
Originally Posted by jt_buck View Post
I've seen 5-6" usually, sometimes it differs. Depends on how tall the box is as well. I've done as little as 10 in^2 per cube on L7 15 and actually built the box and it was very loud. It was 10 cubes net @ 33 hz with a 10 x 10 port, lol. If you run out of space, you can always fire the port upwards, pushed all the way to the rear of the vehicle.
Thank you jt_buck i knew i could count on you to answer. I wanted to do aero's due to limited space but could not get the aero away from the back of the box or the rear of the hatch to breath properly with the tune i wanted...well two 6" aeros yes, but i believe thats too small for these subs.
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Old 07-04-2016, 10:36 AM
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The rule of thumb for slot port is the smallest dimension of the port away from the hatch. So if the port is 10x3, you have to be a minimum of 3" away
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Old 07-04-2016, 01:44 PM
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Originally Posted by doug118 View Post
The rule of thumb for slot port is the smallest dimension of the port away from the hatch. So if the port is 10x3, you have to be a minimum of 3" away
Thank you! Thats excactly the answer i was looking for
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2005 Tahoe which I nicknamed the william hung.... because she bang! Haha!
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Old 07-05-2016, 01:04 PM
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Best 15" box I had was 6cubes with 8" aero. I did a dual 15" 4th order too which played lows like crazy.
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Old 07-05-2016, 02:50 PM
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you can get by with 1/2 port diameter.
so if you have 6" you CAN get by with 3" from hatch. a little more will be better and will not restrict the port or change tuning at all.

imo i would not go less then 6"
should be loud. i loved my L7's
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Old 07-27-2016, 02:58 AM
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well I got it finished a couple weeks ago just getting around to posting. Could have painted the port better and cut the carpet on the port better but blade got dull quick and started snagging on me. not bad for my first carpet box and only my 2nd box build. getting better every time. box ended up being 3.25 cubes per chamber tuned to 30hz. It really kills the lows. I was surprised It did so well, better than my stereo integrity ht15's. I use to talk so much shit about these kicker l7's and this build made me a believer...those things can get down! last pic is of the box he was running...almost sold the setup because it did't hit very good. opened it up and noticed they were only running 1 coil on each sub...they had a jumper wire from coil 2- to coil 2+...lol. so after i connected it right it was better but still the box looks like a 12" box that was cut to a 15" square sub box...either way you can see the huge difference in size and my box still was on the low side of Kickers recommendation.
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File Type: jpg sub build 2.jpg (23.0 KB, 12 views)
File Type: jpg sub wooferbuild 1.jpg (18.9 KB, 17 views)
File Type: jpg sub wooferbuild.jpg (22.4 KB, 16 views)
File Type: jpg sub build 4.jpg (20.6 KB, 13 views)
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Current setup: 2 Obsidian Audio 18's with 8 layer aluminum spl coils and spiders
Power is via 2 car audio bargain CAB-1600.1's strapped @1 ohm. ..also in my spare bag of goodies is...
2 Stereo Integrity HT-15's
1 Stereo Integrity HST-15
2005 Tahoe which I nicknamed the william hung.... because she bang! Haha!

Last edited by williamhung; 07-27-2016 at 03:22 AM.
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Old 07-27-2016, 07:30 AM
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Very nice
Yeah the L7's are good subs no one can argue they are not.
Can be a little pricey and there is better out there but if you can get them for a steal they will make you happy
And they also do love large boxes. Up to 5cf each for the 15's.

I'm glad it worked out for you
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Old 07-27-2016, 08:04 AM
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Quote:
Originally Posted by tymoto21 View Post
Very nice
Yeah the L7's are good subs no one can argue they are not.
Can be a little pricey and there is better out there but if you can get them for a steal they will make you happy
And they also do love large boxes. Up to 5cf each for the 15's.

I'm glad it worked out for you
Thank you! yeah that was one of my complaints about those subs was the size they needed, Kicker actually recommends 6cf for optimal...but wow I was surprised how well they sounded in only 3.25cf. But I love these types of boxes too...pretty easy and come out solid as hell due to the natural bracing the port gives. Only thing that sucked on this build and my last build I did was every time I came back from Lowe's with my wood cut it would always be off..." I swear I measured twice!" come to find out half way thru the build Lowes cutter was off diagonally a quarter of an inch..(bastards!) went to Home depot after that and it was smooth sailing...But gawd damn did I have to to a lot of sanding to get things to fit right! Now on to the next build! hopefully I'll do a little more better cutting the carpet on the port smh.
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Current setup: 2 Obsidian Audio 18's with 8 layer aluminum spl coils and spiders
Power is via 2 car audio bargain CAB-1600.1's strapped @1 ohm. ..also in my spare bag of goodies is...
2 Stereo Integrity HT-15's
1 Stereo Integrity HST-15
2005 Tahoe which I nicknamed the william hung.... because she bang! Haha!
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