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View Full Version : 4th order bandpass, wheel well design :) (design inside)



TWOJZ
01-08-2008, 02:41 PM
going to attempt to make something like this.

its not drawn to scale, but it was rather difficult explaining to people what I wanted to make without having a pic.

so, there it is!

going to have a semi circle perspex window in the top, 4th order bandpass, using the spare tyre well, and the area available above it.

vented through the rear deck

basically no trunk space used!

anyone see any massive problems with the general design? lol, ofcouse, nothing is to scale, so volumes arent correct, that will all be worked out once I start building, or atleast after I measure the car

http://img89.imageshack.us/img89/5255/wheelwelltopdonebg2.jpg

Bloodstalker999
01-08-2008, 02:44 PM
Thats an awesome idea

TWOJZ
01-08-2008, 02:50 PM
Thats an awesome idea

I have the gas tank between the trunk, and the back seat, so I can't do a "conventional" 4th order bandpass vented through the back seat...

skeptikal
01-08-2008, 02:54 PM
lol good luck with that one

hempy
01-08-2008, 02:55 PM
Wouldn't the change in port shape cause turbulence issues? Could you extend the slot pot to the back dash-panel thing (wtf is that called)?

TWOJZ
01-08-2008, 02:57 PM
Wouldn't the change in port shape cause turbulence issues? Could you extend the slot pot to the back dash-panel thing (wtf is that called)?

I normally call it a "parcel shelf" or "rear deck"

however, mine already has a 11inch diameter hole in it from a stock subwoofer, so I could use a rectangle port going through it, but that would just look weird.

I dont know if the rectangle to round transition will cause turbulence, but I guess there's only one way to find out.

Jameseypoo
01-08-2008, 02:59 PM
Better have a steady supply of Head On

jmanpc
01-08-2008, 03:00 PM
That's a cracked out design.

TWOJZ
01-08-2008, 03:07 PM
Better have a steady supply of Head On

a what now?

skydeaner
01-08-2008, 03:09 PM
That would cause massive turbulance, you would almost absolutely be able to hear "chuffing". Keep it rectangular and i see no problems with your design as long as the volumes fit where you plan.

Jameseypoo
01-08-2008, 03:09 PM
http://en.wikipedia.org/wiki/HeadOn

cheapo
01-08-2008, 03:10 PM
a what now?

Head on gets rid of headaches:p:

edit: ^^^^ahh beat me too it

80INCHES
01-08-2008, 03:10 PM
interesting design
wat size sub is this for...im sure u can build something not as complex

80

TWOJZ
01-08-2008, 03:12 PM
That would cause massive turbulance, you would almost absolutely be able to hear "chuffing". Keep it rectangular and i see no problems with your design as long as the volumes fit where you plan.

if its the same port area, and is lots of port area (which it is, a 6inch port for a single 12inch driver) I dont think there will be chuffing...

the other option is to make the round part bigger than 6inches, 8inches maybe, so its no longer an extension of the tuned port :)

TWOJZ
01-08-2008, 03:12 PM
interesting design
wat size sub is this for...im sure u can build something not as complex

80

12inch... and why less complex?

edit: hang on! thats not complex anyway!

its just a box, with the bottom extended into the spare tyre well using fibreglass, a divider down the middle somewhere, and an external slot port.

Wkbdkid
01-08-2008, 03:45 PM
with the sub firing into that chamber an with the small opening, wouldnt that make it seem like another port making it a 6th order? Or is it not big enough to be a port? Hope that makes sense.

Immacomputer
01-08-2008, 03:50 PM
That's not a design; it's a drawing. There is a huge difference between the two.

ultimate157
01-08-2008, 04:22 PM
however, mine already has a 11inch diameter hole in it from a stock subwoofer, so I could use a rectangle port going through it, but that would just look weird.

So make a beauty panel to cover up the rest, and paint the port black.

its_bacon12
01-08-2008, 04:29 PM
that extended piece of the box going up, changing from that rectangular shape to the tube will cause severe audible turbulence. the tuning may be ok but i cant see how it would sound good regardless

IamDeMan
01-08-2008, 05:04 PM
if its the same port area, and is lots of port area (which it is, a 6inch port for a single 12inch driver) I dont think there will be chuffing...

the other option is to make the round part bigger than 6inches, 8inches maybe, so its no longer an extension of the tuned port :)

Flare it to the full 11" that the hole in the rear deck is. Just my .02.

IamDeMan
01-08-2008, 05:06 PM
that extended piece of the box going up, changing from that rectangular shape to the tube will cause severe audible turbulence. the tuning may be ok but i cant see how it would sound good regardless

With the area I doubt chuffing would be heard.

80INCHES
01-08-2008, 11:02 PM
12inch... and why less complex?

edit: hang on! thats not complex anyway!

its just a box, with the bottom extended into the spare tyre well using fibreglass, a divider down the middle somewhere, and an external slot port.

if its 4 1 12 u can draw something up thats alot less complex than that...u wont have to use fiberglass

80

TWOJZ
01-09-2008, 01:50 AM
if its 4 1 12 u can draw something up thats alot less complex than that...u wont have to use fiberglass

80

and I wont have any trunk space left either.

TWOJZ
01-09-2008, 01:52 AM
With the area I doubt chuffing would be heard.

i dont think it will cause any problems actually...

with the proposed size port, the maximum port velocity, with 1500watts to the sub is only 18m/s...

80INCHES
01-09-2008, 07:43 AM
and I wont have any trunk space left either.

yes u will

80

TWOJZ
01-09-2008, 02:26 PM
yes u will

80

no, I won't