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View Full Version : 4th Order Bandpass Preview/Suggestions Welcome (RD Alphamax 15)



GearGuy2001
06-23-2009, 06:42 AM
Alright so Im doing a 4th order bandpass with 2 6" aero ports tuned to 45hz as per 80inches design. A few things changed cause of my trunk so thats why it looks so crazy. Keep in mind its a rough sketchup and I have figured out the ported cubes yet.

I had concerns about the port having turbulence issues since I would have to use 90* connectors, in order to solve this i extended the box so that the aeros could be straight.

Im thinking for the filler plates I would glue and screw and also fill with expanding foam, thoughts?

Im open to suggestions :D

http://img.photobucket.com/albums/v157/GearGuy2001/new%20ca%20setup%20pics/DSCN2097.jpg

The new box will "hang" on that ledge

http://img.photobucket.com/albums/v157/GearGuy2001/new%20ca%20setup%20pics/DSCN2098.jpg

The aero ports will go into the old 6x9 speaker holes

http://img.photobucket.com/albums/v157/GearGuy2001/new%20ca%20setup%20pics/boxpreview.jpg

If you have any concerns please point them out, I'm not perfect and this is my first 4th order so if I'm doing something wrong let me know before I start building. Lol

GearGuy2001
06-23-2009, 05:51 PM
No comments at all..... I see how it is

528hz
06-23-2009, 06:01 PM
This is going to be really interesting! Can't wait to see a BP in a trunk, especially a 15."

What amp are you going to use? I know it's gotta be bigger than that 1000D...

murderedtahoe
06-23-2009, 06:08 PM
bandpasses can get loud as hell and ound good heres one i did a while back. should give u some ideas it was 6 12's tho.

http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0015.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0013.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0011.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0010.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0009.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0008.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0006.jpg

murderedtahoe
06-23-2009, 06:09 PM
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0005.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0001.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0004.jpg
http://i55.photobucket.com/albums/g159/oriontahoe/DCFN0003.jpg




that should help you out a little bit give you some ideas on how to do it.

DDbump
06-23-2009, 06:15 PM
firing throw the 6x9s in a sweet idea

GearGuy2001
06-23-2009, 07:30 PM
This is going to be really interesting! Can't wait to see a BP in a trunk, especially a 15."

What amp are you going to use? I know it's gotta be bigger than that 1000D...

Yeah It should be really interesting haha

Also Im looking at a stetsom 2k5, a sundown 3000d or 2000d, or an audioque 2200

Something along those lines

Murderedtahoo that bp design looks sick, did you ever get it metered, I bet even with the pioneer premieres it got loud.


firing throw the 6x9s in a sweet idea

Yeah I havent had rear speakers for awhile and its already cut for me plus it fits 6" pvc.... finally something is working out in this car (since the rear seats dont fold down).

murderedtahoe
06-23-2009, 07:45 PM
it been an while back but it was over 150 on music had a bunch of mmats amps those pioneer took alot of power sealed. needless to say it hurt to sit in the car lol

80INCHES
06-24-2009, 01:40 AM
90degree elbows will not effect it becuz the edges are already rounded so no air will be sitting there....if is was a regular slot port that has a 90 edge yea some pressure will be created there

80

GearGuy2001
06-24-2009, 02:37 AM
90degree elbows will not effect it becuz the edges are already rounded so no air will be sitting there....if is was a regular slot port that has a 90 edge yea some pressure will be created there

80

Ahhh now someone tells me lol

This design more closely follows your original as in order to do the other I needed to use 3 6" aero's to get enough port length.

GearGuy2001
06-24-2009, 06:06 AM
http://img.photobucket.com/albums/v157/GearGuy2001/new%20ca%20setup%20pics/finalish.jpg

Getting closer to a final design.... maybe

michaellane
06-25-2009, 05:10 PM
i asked 80 about helping me design one and he hasnt replied :(

Savag3
06-25-2009, 05:14 PM
interesting design . . how did you get the figures for the chambers ?

galacticmonkey
06-25-2009, 05:17 PM
I would put the sub at the very bottom where your box is not firing up, using the whole top as a ported chamber with the ports going in between the gas tank hump and rear deck, then coming up through the deck.

GearGuy2001
06-25-2009, 06:44 PM
i asked 80 about helping me design one and he hasnt replied :(

He helped me almost a month ago or so, I heard he is really backlogged now... I guess 4th Orders are the next big thing or something???


interesting design . . how did you get the figures for the chambers ?

With a calculator and my brain. I got the original design from 80 and so far have just adapted it to work for my particular vehicle


I would put the sub at the very bottom where your box is not firing up, using the whole top as a ported chamber with the ports going in between the gas tank hump and rear deck, then coming up through the deck.
I think I have an idea of what you mean, Im going to post a design a lil later and you can tell me if thats what you mean.... I would of messaged you on AIM but you arent on.

GearGuy2001
06-25-2009, 08:13 PM
http://img.photobucket.com/albums/v157/GearGuy2001/new%20ca%20setup%20pics/galarevisionmaybe.jpg

Gala, I think this is what you meant? LMK via PM or AIM