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Old 04-04-2012, 08:27 PM
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Default 4th order questions

So I have 2 18 in. Incriminator Audio Death Penalty and I am looking for some info on doing them in a 4th order wall. Looking to do subs on the outsides with port in the middle.

1. I can't find the sealed specs for them anywhere so were do I start on it. I am obviously doing a wall so I need to do it as close to right as possible the first time since wood is pricey.

2. The box ratio needs to be 2:1 I have read...sooo if I do 3.25 cubes for the sealed sides do I need to do 13 cubes for the ported area in the middle?

3. How would I go about doing the tuning? Should I tune high and let the sealed areas do the work with the SQ aspect or should I just tune like I usually would for a SPL box?
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Old 04-04-2012, 08:29 PM
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3.25 for seal is way too small lol. i sy go with 10 seal, work on shrinkin it
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Old 04-04-2012, 08:31 PM
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The problem is I have to build this inside the car. If I do 5 cube per sub then I won't have room. I only have about 16 cubic feet inside to work with. lol Huge problem I know, but I have seen it done in smaller cars.
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Old 04-04-2012, 08:32 PM
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Looks like you have it layed out right, and yea 3.25 per chamber into 12.5-13, I would start tuning at 55hz then start taking up port area if you want it to play lower/shift the passband.
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Old 04-04-2012, 08:34 PM
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Can I do some sort of port insert for a daily(demo setting) and remove it for a SPL setting? Or is it just 1 size fits all kinda deal?

I am still trying to learn on these. It is a completely new aspect to me, but I am after numbers while since its my daily driver being able to demo it sometimes or listen to it on the way to work.
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Old 04-04-2012, 08:35 PM
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Quote:
Originally Posted by tyoung515 View Post
Looks like you have it layed out right, and yea 3.25 per chamber into 12.5-13, I would start tuning at 55hz then start taking up port area if you want it to play lower/shift the passband.


this
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Old 05-16-2012, 09:33 PM
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If you are still wondering yes you can make removable ports for your bandpass wall. You could put 4 polls of threaded rod where you are going to put the port and just bolt it in using the rod as an anchor. And unbolt it then bolt in your daily port.
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Old 05-16-2012, 09:47 PM
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Not did a wicked slot port design. Was a cube and a half shy of being able to do a 4th order.
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