Another Dual Kicker L7 15" BOX

[nahinder]

Hi Guys,

I own an BMW e23 1980 and two Kicker L7's 15 inch

Right now I got them both mounted on the back of my rear seat, doesn't sound too bad but i figured a box would sound a lot better.

So these are the max dimensions of the box i could build hope you guys could help me out building the best box i can fit in the trunk.

H: 35 cm / 13.78 inches*

W: 80 cm / 31.50 inches*

D: 60 cm / 23.62 inches*

If the dept gets smaller (around 40 cm) i can get the box higher up to 40 cm 15.75 inches*

For the port location is it better to point it into the car ? Cause i already got an hole cut in the middle of the back of the rear seat plate.

Thanx for any help.

*converted with google.

[john253a]

Are you willing to cut through the big steal plate between trunk and car

Otherwise except some major output loss

First think first

NOT ENOUGH ROOM FOR 1

Let alone 2

Option 1

Either build it ported for 1 and just except what you get is what u get

2

Sell both and get 2x12" and port them

3

Run them both sealed

[Joe X]

You can try a wall or you can sell the car and get something larger if you want to use those subs.

[nahinder]

Are you willing to cut through the big steal plate between trunk and car

Otherwise except some major output loss

First think first

NOT ENOUGH ROOM FOR 1

Let alone 2

Option 1

Either build it ported for 1 and just except what you get is what u get

2

Sell both and get 2x12" and port them

3

Run them both sealed

If i cut the metal plate wont it affect the chassis of the car ?

[john253a]

The only other option with out cutting is 4th order through the ski port or rear shelf

I did a blow through style box through the ski hole for 2 focal 12 in a 7series and I wouldn't recommend it again

Work v's outcome just waserents worth it

If you haven't herd of 4th order google it

You'll only fit a single 12 may even push a 15"

But in your tight area

Deaden entire trunk and double check the seat plate is sealed up tight

You may even need to seal some spots or glass the area

Measure what volume you have and everything you have

Make a normal sealed box and port the remainder of the trunk Into the car through the rear shelf

Off memory I think you'll get something like 2net sealed and 5net ported

This won't be a true 4th but you want have to cut your ride and adjusting the port length and size is easy as

I'm running my car the same way(no rear fill) just 2x 8" aeros on rear shelf tuned to approz 120hz

And 2 sa8 ported at 32hz

I tryed 6" and 8" and different length(trial and error) until I got a nice blend in car

[nahinder]

Thnx John,

Looked at some 4th order boxes but they look too complicated to calculate.

If i choose to do a sealed box what would the dimension look like? The standard kicker dimension wouldn't fit

[nahinder]

You can try a wall or you can sell the car and get something larger if you want to use those subs.

How would you wall 2 15s in this car ? using the rear seat space for the box ? or did you have an other idea ?

[john253a]

Yes you remove rear seat

And that area becomes your box

Depending on the volume avaible it will either be window line or higher

But this would require it to be built in car

[nahinder]

I can't do such a drastic cut in this car so that's no option, if i would do a sealed box should i build maximum sized box or do you recommend a different volume ?

BTW i wanted to do a big three upgrade but there ain't no cable from the alternator to the positive, but there are cables running from the alternator to the starter engine, and 1 from the starter to the positive. Should i run a cable directly from the alternator to the positive ?

[john253a]

no need to cut anything to do a wall

just remove the rear seat and rear shelf

and build the box in the car

when your finished cut the box out install the rear seat and shelf if you still have them