PDA

View Full Version : Help on my BMW e36 Sedan Bandpass Project!



DjDecibel
07-31-2011, 10:28 PM
Hello!
this is my first post here! i'm DjDecibel From Italy :)

i own a bmw e36 Saloon, and this is the problem.. it has a sealed trunk!!! the only holes between the trunk and the car interior are the original 4" speakers holes!

i just bought:
2 X Spl Dynamics PRO-12D2 MK-3


Size: 12 Inches
Power handling (RMS/Peak): 500/1000 W
Nominal impedance: 2 x 2 Ohm
Mounting depth: 6.62 inch
Mounting diameter: 10.87 inch
Magnet diameter: 6.7 inch
Magnet height: 1.58 inch
Magnet weight: 130 oz
Voice Coil diameter: 2,56 inch
Voice Coil Type/Material: DVC/BASV
Fs: 29 Hz
Vas: 1.907 ft^3
Qts: 0,42
Qes: 0,44
Qms: 6,1924
Xmax (lin/peak): 0.67/1.34 inch
Re: 2 x 1,8 Ohm
Mms: 217 g
BL: 18,1 TM
SPL (1W/m): 86,8 dB

Box suggestions:
Closed box 0,918 - 1,413 ft^3
Bass-Reflex box 1,130 - 2,119 ft^3



i need to make 2 different boxes because one entire box can't enter from the trunk..

here's my idea: a 4th order bandpass with 2 cubic sloped separate boxes that uses the originale holes for the vents:
http://www.caraudio.com/forums/attachments/enclosure-design-construction-help/26526254d1312165664-help-my-bmw-e36-sedan-bandpass-project-e36_project.jpg

here the space i can use for each box
http://www.caraudio.com/forums/attachments/enclosure-design-construction-help/26526255d1312165665-help-my-bmw-e36-sedan-bandpass-project-box_wedge_out_off.gif
W=16,55inch
H=16,15inch
D1=18,12inch
D2=11,43inch

i can increment or decrease only D1 and D2..

can anyone help me with my bandbass project?

The_Grimy_One
07-31-2011, 10:46 PM
Cut the ski hole out and then run the port through that :)

infamous_e46
07-31-2011, 10:51 PM
on my e46 the ski pass is only spot welded on in 4 places u can take it off with a screw driver and a hammer

surreal
08-01-2011, 07:58 AM
They have a good point..
Taking a look through it seems those subs are best suited ported/6th order as opposed to 4th. Not to say it cant work, the VAS is rather high on those subs which will make them considerably easier and more fitting than a similar super-strong motor sub.

DjDecibel
08-01-2011, 10:08 AM
open the ski pass in the trunk is simple, but in front of the hole there's the rear seat and it's without hole, and it's composed of more than 30cm of sponge and leather :D

the idea of a curved port is wrong?

DjDecibel
08-01-2011, 08:46 PM
any suggestion?

RAM_Designs
08-01-2011, 10:54 PM
They have a good point..
Taking a look through it seems those subs are best suited ported/6th order as opposed to 4th. Not to say it cant work, the VAS is rather high on those subs which will make them considerably easier and more fitting than a similar super-strong motor sub.

You literally just read my mind.

Moble Enclosurs
08-02-2011, 12:11 AM
Cut the ski hole out and then run the port through that :)

Agreed. The last two designs I built for the e36 sedan and e46 convertable were through the skipass. Recommended as you will get more port area as well that way without too many complicated bends.

RAM_Designs
08-02-2011, 01:00 AM
Agreed. The last two designs I built for the e36 sedan and e46 convertable were through the skipass. Recommended as you will get more port area as well that way without too many complicated bends.

Indeed, much easier to design and build it this way.

DjDecibel
08-02-2011, 08:32 AM
but i don't have the skypass in the rear seats! :D so it's a problem :P

i'm going to buy the SPL Dynamics because them are better for the low frequencys i think..

i listen to RnB, a lot of Lil Jhon, and a italian music genre called HardSlow Style

wich one will be better?

Moble Enclosurs
08-02-2011, 08:36 AM
but i don't have the skypass in the rear seats! :D so it's a problem :P

i'm going to buy the SPL Dynamics because them are better for the low frequencys i think..

i listen to RnB, a lot of Lil Jhon, and a italian music genre called HardSlow Style

wich one will be better?

Not a problem, just different. Nothing that wood cannot be wrapped around, lol. Would you like one of us to design it for you? PM any of us. If you do not mind paying for a design, others here and I can help finish a design for you, and some may even do it free. Just ask around. We can get you hooked up, trust me....enough knowledge involved this thread alone to get you what you need. :) Just let one of us know

DjDecibel
08-02-2011, 08:49 AM
Not a problem, just different. Nothing that wood cannot be wrapped around, lol. Would you like one of us to design it for you? PM any of us. If you do not mind paying for a design, others here and I can help finish a design for you, and some may even do it free. Just ask around. We can get you hooked up, trust me....enough knowledge involved this thread alone to get you what you need. :) Just let one of us know

mmh.. i'd like a help but i can't pay :P but i don't know how to make a good design with a good sound.. here in italy the bandpass is rarely used.. but it's the unique solution for my car... but without ski pass it's a bit difficult for me..
for this reasond would be great if someone can design a enclosure for me :)

ps: here the specs of the spl dynamics converted in USA unit :P



Spl Dynamics PRO-12D2 MK-3

Size: 300mm (12")
Power handling (RMS/Peak): 500/1000 W
Nominal impedance: 2 x 2 Ohm
Mounting depth: 6.62 inch
Mounting diameter: 10.87 inch
Magnet diameter: 6.7 inch
Magnet height: 1.58 inch
Magnet weight: 130 oz
Voice Coil diameter: 2,56 inch
Voice Coil Type/Material: DVC/BASV
Fs: 29 Hz
Vas: 1.907 ft^3
Qts: 0,42
Qes: 0,44
Qms: 6,1924
Xmax (lin/peak): 0.67/1.34 inch
Re: 2 x 1,8 Ohm
Mms: 217 g
BL: 18,1 TM
SPL (1W/m): 86,8 dB

Box suggestions:
Closed box 0,918 - 1,413 ft^3
Bass-Reflex box 1,130 - 2,119 ft^3

DjDecibel
08-02-2011, 10:16 AM
i finally bought the Spl Dynamics Pro-12d2 mk3
the people is telling me that those subs are more musical than the Ground Zero..

any help for the enclosure?

Moble Enclosurs
08-02-2011, 07:33 PM
If no one helps you soon, and I get caught up on blueprints, I will be happy to help you out on the thread here. I will let you know where I stand in a few days. :)

DjDecibel
08-03-2011, 10:45 AM
lol, any help? :)

Moble Enclosurs
08-03-2011, 10:50 AM
I can plug some specs in for you today, but again, very basic for now unless you want to purchase a full design. But Ill see what I can do for now. Im working on two blueprints today that are purchased, so once I get caught up on those, Ill take a look at what we can do for you. What I am going to do so far is take a look at the measurements of the enclosure idea you sent me through PM and give you some info on it with the driver specs. This is all I can do for now with calculations. But i hope it helps you out! :) Ill be on later today, or if I cannot get to it, likely tomorrow. Ill do what I can.
Thank you!

DjDecibel
08-03-2011, 10:58 AM
thanks man :) i was just asking if anybody else can give me some help :) you're already helping me a lot :)

Moble Enclosurs
08-03-2011, 06:35 PM
thanks man :) i was just asking if anybody else can give me some help :) you're already helping me a lot :)

LMAO. nice.