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View Full Version : 4th or 6th order bandpass design help



mrmitchell
07-28-2012, 09:07 PM
I have 6 digital design 1500 series 15s. I'm trying to get the most output possible. The enclosure will be a wall and all this will be going in a 2000 suburban. My third row is already out. As far as space I can go 45deep 48 wide not to sure on height.

Kangaroux
07-28-2012, 09:14 PM
How much power do you have and what freq. range do you wanna focus on?

murph
07-28-2012, 09:19 PM
Not gonna happen you are looking at like 27 cubes in a 4th order...

Kangaroux
07-28-2012, 09:21 PM
Not gonna happen you are looking at like 27 cubes in a 4th order...

Suburbans are pretty big man lol the third row alone is almost as much as I have with my 2nd row backseat out in my pathfinder

mrmitchell
07-28-2012, 09:24 PM
How much power do you have and what freq. range do you wanna focus on?
I have 2 Crescendo bc2000s strapped@ 1.3 ohms so close to 4.5k

mrmitchell
07-28-2012, 09:25 PM
I just want to play music loud as possible. Tuned low

Kangaroux
07-28-2012, 09:27 PM
I just want to play music loud as possible. Tuned low

These two things don't really go too well hand-in-hand (being loud as possible and tuning low). I assume you mean you want it tuned low but still loud? lol

mrmitchell
07-28-2012, 09:28 PM
Not gonna happen you are looking at like 27 cubes in a 4th order...

I can get 24 cubes in the back before displacement without a wall. I'll get exact measurements to be sure

mrmitchell
07-28-2012, 09:31 PM
These two things don't really go too well hand-in-hand (being loud as possible and tuning low). I assume you mean you want it tuned low but still loud? lol

Lol yeah your right. I don't really put my system on the meter that much. Im looking to just have a wow factor when I go to car shows

mlstrass
07-30-2012, 02:54 AM
flat wall with center port...

mrmitchell
07-30-2012, 09:18 PM
flat wall with center port...

Too many people have that type of wall in my area no one has a bandpass let alone knows what that is lol

murph
07-30-2012, 09:23 PM
Too many people have that type of wall in my area no one has a bandpass let alone knows what that is lol

3 15's each side facing each other with the port centered.

mrmitchell
07-30-2012, 09:30 PM
3 15's each side facing each other with the port centered.

Do you mean having them in a sealed and using the center as a ported box? Or just a regular vented box?

murph
07-30-2012, 09:49 PM
Do you mean having them in a sealed and using the center as a ported box? Or just a regular vented box?

Each side sealed center as a ported box.

mlstrass
07-31-2012, 03:10 AM
Too many people have that type of wall in my area no one has a bandpass let alone knows what that is lol

because they are proven to get loud and that was your main objective....

mrmitchell
07-31-2012, 04:31 PM
Your right but I just want to try to something different

psych0ticnemes1
07-31-2012, 04:42 PM
From what I have read 6th order can be quite tricky. I'm not sure how low a band pass will play without sacrificing some at the other end of the spectrum.

xSPLoder
07-31-2012, 04:50 PM
Pete from PKW Designs specializes in 4th or 6th order bandpasses for DD subs specifically. I would look him up on fb

murph
07-31-2012, 05:03 PM
From what I have read 6th order can be quite tricky. I'm not sure how low a band pass will play without sacrificing some at the other end of the spectrum.

Well designed 6th or 4th orders will give a wider spectrum of play with more output than a standard ported box.

psych0ticnemes1
07-31-2012, 06:01 PM
Well designed 6th or 4th orders will give a wider spectrum of play with more output than a standard ported box.

Sounds like we should all be using bandpass boxes then. lol

wenn_du_weinst
07-31-2012, 06:03 PM
a 4th order will not have more output then a ported box is the ported is built correctly.

murph
07-31-2012, 06:07 PM
a 4th order will not have more output then a ported box is the ported is built correctly.

A 4th order can be much louder but, when you go for loud with one they become very peaky. Both 6th and 4th order definitely will play a wider spectrum when designed properly.

psych0ticnemes1
07-31-2012, 06:09 PM
a 4th order will not have more output then a ported box is the ported is built correctly.

Why's that?

mrmitchell
07-31-2012, 06:23 PM
I talked to Kevin at DD and he said I would get a 6db gain by using a bandpass enclosure

wenn_du_weinst
07-31-2012, 06:26 PM
if you understand how a ported enclosure an a 4th order work you will see it is impossible for a 4th order to be louder if both are at maximum efficiency. The reason 4th orders are used in burp cars is because they are easy to get peaky and makes it easier to deal with the rear wave and cancellation.

pro-rabbit
07-31-2012, 06:35 PM
I talked to Kevin at DD and he said I would get a 6db gain by using a bandpass enclosure

Kevin is a customer service guy, not a tech guy. When I worked with him he was less then knowledgeable about enclosures anything technical. He normally does very well in customer service though.

mrmitchell
07-31-2012, 06:39 PM
Kevin is a customer service guy, not a tech guy. When I worked with him he was less then knowledgeable about enclosures anything technical. He normally does very well in customer service though.

So what is your take on it? Should I go standard ported instead of bandpass?

pro-rabbit
07-31-2012, 06:43 PM
My opinion is a standard wall unless you just want a 4th order. We are doing a 3rd row wall 4th order with 4 15s right now, but it is really because the owner wants it, not what we suggested.

mrmitchell
07-31-2012, 06:50 PM
It would be easier. now I need a design for my 3rd row wall