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View Full Version : What do you guys think of my design (with pics)



DarkFox
04-16-2006, 03:56 PM
all right guys, here is the design i am thinking of doing for my friend. Its going to be 2 15" kicker L7s with 2,000W RMS in a expedition. I have 2 ideas in here. Which one would you go with or would you do it all together different.


Idea 1:

port:
6 X 16.25 X 14.75
(with wood : 7 1/2 X 16.25 X 14.75)
Displacement: 1798"

Woofer displacement : 0.20

Required space: 9.0 ft cubed

Minimum box size: 10.24ft cubed

37.5 X 16.25 X 29 or 10.23 ft cubed

http://img505.imageshack.us/img505/9716/idea19di.jpg


Idea 2
port:
6 X 16.25 X 14.75
(with wood : 6.75 X 17.75 X 14.75
Displacement : 1767"


Woofer displacement : 0.20

Required space: 9.0 ft cubed

Minimum box size: 10.22ft cubed

33 X 23 X 23.5 or 10.32 ft cubed

http://img57.imageshack.us/img57/5862/idea27mz.jpg

My preference is with idea 2 I think only because its alot slimmer and I think it will fit alot easier. how do you guys think they will sound? Sorry for the crappy images.. I only have paint available and I'm not very artistic anyway.

davidfre21
04-16-2006, 04:00 PM
do the second design but put the subs on top port on bottom

MikeyB
04-16-2006, 04:00 PM
I would rather use your first setup, have you thought about using aeroports?

MikeyB
04-16-2006, 04:00 PM
do the second design but put the subs on top port on bottom

x2 if you were to do that

hofulstrof
04-16-2006, 04:04 PM
i would choose the first design.but add alot more braceing.and possably bump up the port area a bit more. somewhere around 117sq".

DarkFox
04-16-2006, 04:10 PM
david, do you mean to just physicaly flip the box upside down on the second one? thats what its sounds like your saying, in which case that wouldnt change the sound at all, simply port location pref (on bottom vs. top)

hofulstrof, this is a rough plan, your definatly right, that kinda power and those subs needs alot of bracing. with the bigger port area what kinda lengther would I have to go?

How do you think Idea 2 would sound as is, (with more bracing then shown?)

MikeyB
04-16-2006, 04:14 PM
david, do you mean to just physicaly flip the box upside down on the second one? thats what its sounds like your saying, in which case that wouldnt change the sound at all, simply port location pref (on bottom vs. top)

hofulstrof, this is a rough plan, your definatly right, that kinda power and those subs needs alot of bracing. with the bigger port area what kinda lengther would I have to go?

How do you think Idea 2 would sound as is, (with more bracing then shown?)

He means drop the port to the bottom instead of up at the top, then position the subs on top so that they are firing up.

hofulstrof
04-16-2006, 04:17 PM
both ideas will work great.and the more area the longer the port.

i suggest you download winisd and play arond with it

DarkFox
04-16-2006, 04:20 PM
oh, thanks for clearing that up, whats the advantage? I had always heard that having the opening of the port right behind the sub sounds crappy, but I have been out of the game for a while.

hofulstrof
04-16-2006, 04:26 PM
ok if you bump the port area up to 115sq" the port will be about an 1" longer. but remeber these are rough estimates. and your tuneing will be around 35hz.

either set up will rock.

DarkFox
04-16-2006, 04:56 PM
Is this gonna be the kinda system that drops low and will really blow his mind? For example on songs along the line of what.... I dont know, what Ludacris does, you know hes got alot of deep rolling bass in most his songs. Will those kinda songs really sound clean and bump outa control?

And hofustrol, is your more port area and longer port just to make the box more efficent? I mean if I keep the general disign of plan 2 and just make the port wider and deeper I can do what you said easy. So would it just sound the same (tuning wise) but get louder?

I'm afraid to deviate away from manufacturers specs but you guys seem to know what your talking about here and free volume is always nice...

hofulstrof
04-16-2006, 05:14 PM
i would expect your drivers to start unloading around 30hz.... but remeber we are both working with rough numbers so things could change..... and as for sounding clean. i doubt it.
the reason i suggesed more port area was so you dont end up with port noise.it really doesnt have anything to do with effecieny

DarkFox
04-16-2006, 05:31 PM
Ok. what do you mean "Unloading." So you think if I go with your specs for port area it will sound alot better on the whole? I'm not worried about loudness... the fact that there square 15s and he has 2000 watts will handle that, I want to make sure they sound at least resonably clean. Obviously not a purely SQ setup, but some quality would be nice. I cant find a actual tech spec sheet on the 04 L7
but from the stuff I did see, when I ran it in a port calculator program, i came up with numbers alot closer to yours for port area.

DarkFox
04-16-2006, 07:22 PM
All right hofustrol I hope this makes both of us happy:

Idea 3
Port:
6 X 20 X 20
(with wood : 6.75 X 21.5 X 19.25)
displacement : 2793.66 (1.62cube ft.)

Woofer displacement : 0.20

Required Space 9.0 ft cubed

Minimum box size: 10.82 ft cubed

23 X 24.75 X 33 or 10.87 ft cubed

http://img51.imageshack.us/img51/8263/idea37jd.jpg

I'm using the program I found here:
http://www.darkscience.com.au/caraudiohowto/slotcalc/

If I did it right this is what i got

120sq" port area
30.2Hz tuning Freq

Let me know what you think or if I'm doing anything wrong here.

hofulstrof
04-16-2006, 08:47 PM
looks like your getting the hang of things. the port calculator you are useing will work fine)but you are still forgetting to take into account the diplacemnt of your braceing.

what are your absolute maximum dimesnsions to work with.....

DarkFox
04-16-2006, 11:40 PM
How much bracing are you talking about? I was thinking like 3 X 3 Triangles every so often on the inside...

As for dimensions.... he is trying to keep his third row seat in, in the expedition. However he has said if he has to take it out he will. If we were to take it out he would have the whole back area of the expedition with out going over the hight of the seats... as is this box is already pretty big.

Edit: Just played with the port calculator program, if the bracing took up a half cubic foot of space it would raise the tuning to 31hz

hofulstrof
04-16-2006, 11:57 PM
when i say braceing i mean something like this
http://img216.imageshack.us/img216/3843/35cfported30hz2aa.th.jpg (http://img216.imageshack.us/my.php?image=35cfported30hz2aa.jpg)
those 3x3" triangles will be almost useless.

DarkFox
04-17-2006, 12:54 AM
those dont change the sound of the box? besides the change from airspace that is? you think you could desighn / post a box similiar to what I am trying to accomplish whith these subs?

hofulstrof
04-17-2006, 12:56 AM
l
what are your absolute maximum dimesnsions to work with.....
i hate to quote my self but..

DarkFox
04-17-2006, 01:09 AM
Lol.. thanks hofulstrof, PM sent