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View Full Version : Ported box plans for 2 12" L7s



KK07
12-23-2005, 02:44 AM
Hey there, I have a guy here in town ready to build a ported box for me for my pair of 12" L7s. I just need the most ideal box plans for my set up, I'd like the total volume to be around 5 cu feet (2.5 cubes each) and have it tuned to around 36 hz. The max dimensions for my trunk are 31" wide x 10" tall x 34" deep. Polecat suggested the 2.5 cubes each and this is listed as a "street bass" enclosure in the Kicker manual. I have about 1000 watts rms total to play with so 500 watts each.

Now my question is, when you multiply 31x10x34 and divide by 1728 you get ~6.0 cubes net, but how does port area factor into this? In the Kicker manual they have this:

Street Bass 2.5 cu feet + port; 2.5 x 13.25" port, 16.5" long

When port area + sub displacement are added into the enclosure volume, should I end up with about 5 cubes net? Sorry about all of the questions, I'm just looking for the most ideal efficient enclosure for my car (97 Grand Am). I've already messaged JMac and saywhat? so hopefully one of them can help me but if someone else has time to design one, please let me know, I have paypal ready, thanks a lot!

Jordantyler
12-23-2005, 02:51 AM
i would send an email to saywaht? he doesnt like PM's

KK07
12-23-2005, 02:56 AM
i would send an email to saywaht? he doesnt like PM's

Yeah, sorry, I should have said that, I sent him an e-mail.

Alright, I'm just going to attempt the port thing here:

Okay 31x10x34 = 10540 / 1728 = ~6.1 cubes net

So now I'd take those specs kicker gives for port right? Multiply those out?

2.5x13.25x16.5 = 546.56 x number of ports? (2) = 1093.125 / 1728 = 0.63 cubes

So would I go 6.1 cubes - 0.63 cubes - sub displacement and that would equal the net volume?

Please tell me if this is completely wrong haha, I'm learning as I go here so hopefully I'm close to being on the right track, thanks for your help!

squeak12
12-23-2005, 03:31 AM
Those are outside dimensions. You need to account for wood thickness which is
.75 so it goes like this
29.5*8.5*32.5= 8149
8194 / 1728 = 4.72
4.72 - (.63*2) = 3.46
You will have just over 3.25 cubic feet after all displacement. You want 5 cu. ft. correct?

KK07
12-23-2005, 03:50 AM
Those are outside dimensions. You need to account for wood thickness which is
.75 so it goes like this
29.5*8.5*32.5= 8149
8194 / 1728 = 4.72
4.72 - (.63*2) = 3.46
You will have just over 3.25 cubic feet after all displacement. You want 5 cu. ft. correct?

Yeah I wanted 5 cu feet :crap:, so 3.25 cubes is the most I can get with those dimensions? Those dimensions = no trunk at all for me so I can't add anymore :(. Dammit...

squeak12
12-23-2005, 04:24 AM
What do you have a Mustang or something?

saywhat?
12-23-2005, 12:39 PM
hey man. i just emailed you back about some possibilities before reading this thread. I think your best bet is to sell off one of your L7's and fit the correct box to one of them with the power you have. Im almost certain you would be as loud or louder than two squeezed in that tiny box.

saywhat?
12-23-2005, 12:40 PM
by the way, thanks for the props ms. jordan, always great to hear from ya.

KK07
12-23-2005, 03:09 PM
I have a 97 Grand Am, I always though I had a decent sized trunk, bah. I guess I could try selling one of them but I really wanted a 2 sub set up.

KK07
12-24-2005, 12:45 AM
Is there any realistic way of fitting the box into the trunk through the trunk opening? I was planning on removing the back seat to fit it in there but there are these little sections that support the back seat that will get in the way. I actually have like 36 x 15 x 40 but I guess my installer was factoring in a method of actually getting it in the trunk. I'm pretty sure I could bring the height number up a couple of inches...I don't know though, anyone have any opinions on this?

saywhat?
12-24-2005, 12:52 AM
hey man, get on aim if u have it and we can try to figure something out.

KK07
12-24-2005, 01:43 AM
hey man, get on aim if u have it and we can try to figure something out.

Hey, I'm on, I tried messaging you but it says you're offline haha.

Tayta_Mayne
12-24-2005, 02:00 AM
I might buy one of your L7's if you wanna sell one. pm me with a price if your gonna sell maybe we can work a trade out, or just cash if you want