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(8) Ported Incriminator Audio Judge 21" build


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#1 lukeamdman

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Posted 19 September 2016 - 06:31 PM

I've been modeling ported enclosures for my IA 21s for a few months and have also received a lot of feedback from Ricci and LTD02. 

 

25hz+, I'm completely satisfied with the system.  On the low end of the SPL spectrum, I'm around 130db at 10hz and 136db at 17hz. After 6+ months of testing various levels of boost <10hz, in my room it just doesn't add anything. 10hz is definitely noticeable/enjoyable, so I don't want to lose any SPL there.

 

The current plan is 8 of these:

 

 

Port%20bracing_zps1cielryi.jpg

 

Port%20bracing%20and%20walls_zpsbghs5rht

 

baffle_zpszibfld7x.jpg

 

 

Bracing will be leftover scraps:

 

bracing_zps81kcjwbo.jpg

 

 

 

 

Outside dimensions with double baffle:

 

36" wide

28.5" tall

30" deep

 

(3) 8.5" x 2.625" ports.  Port length is ~55".

 

Net internal volume: 11.72cu.ft

 

 

Tune ended up at 14hz:

 

15hz%20impedance_zpsrqf9drhq.jpg


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#2 lukeamdman

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Posted 19 September 2016 - 06:33 PM

Current build for the IA 21s:

 

http://data-bass.ipb...21-build/page-1



#3 SME

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Posted 19 September 2016 - 08:13 PM

Bummer about < 10 Hz, but this does seem to be a logical direction to go in.  Will these get you to 150 dB SPL in your room?  :)

 

Do you actually have room for 8 of these cabinets?

 

Also, do you plan additional bracing for the port other than what's shown?



#4 lukeamdman

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Posted 19 September 2016 - 08:23 PM

Bummer about < 10 Hz, but this does seem to be a logical direction to go in.  Will these get you to 150 dB SPL in your room?  :)

 

Do you actually have room for 8 of these cabinets?

 

Also, do you plan additional bracing for the port other than what's shown?

 

This should bump me to about 143-144db from 15hz and up at the seats. 

 

This is the most I've measured in the room so far:

 

147db_zpsfuiuytbc.png

 

 

 

That's all I was planning for bracing.



#5 lukeamdman

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Posted 19 September 2016 - 08:36 PM

Oh and I forgot, I'll have to move the mains/center/tv forward about 15" in order to fit all this...

 

I'll have a stack of 4 behind each main, with an Othorn on its side on top of each stack.  lol


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#6 Infrasonic

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Posted 19 September 2016 - 10:04 PM

How much space is there between your mains? Can you place both Othorns on their side and fit them between the mains with the center on top?



#7 lukeamdman

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Posted 19 September 2016 - 10:08 PM

How much space is there between your mains? Can you place both Othorns on their side and fit them between the mains with the center on top?

 

Just measured and there's only 64" between the mains, so no.

 

The room being only 12.5' wide is a big constraint.  It'd be nice of the room were 6ft wider.  First world problems lol. 



#8 Infrasonic

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Posted 19 September 2016 - 10:16 PM

Hey, at least your room is even that wide. Mine was 10.5ft wide and now it's only 9.5ft wide. UUuuugggghhhhhhhh!!!!

 

Looks like there is space on each side of the mains to give up to the middle of them though? Aight then. Nix that idea.



#9 lukeamdman

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Posted 19 September 2016 - 10:27 PM

Hey, at least your room is even that wide. Mine was 10.5ft wide and now it's only 9.5ft wide. UUuuugggghhhhhhhh!!!!

Looks like there is space on each side of the mains to give up to the middle of them though? Aight then. Nix that idea.


The space on each side of the mains is just enough for my fat gut to squeeze back there.

#10 Infrasonic

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Posted 19 September 2016 - 10:33 PM

So climbing over Mount Uber Speaker doesn't sound appealing to you?

 

Not many people can say they require rock climbing gear to get to their subwoofers. ;)


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#11 Ricci

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Posted 20 September 2016 - 01:44 PM

How much depth is going to be or is being taken up? Wall to the front of the mains?



#12 lukeamdman

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Posted 20 September 2016 - 04:36 PM

How much depth is going to be or is being taken up? Wall to the front of the mains?

 

Right now from the back wall to the front of the mains is about 71".  The sealed subs/othorns are 24" wide, and the mains are 30" deep.

 

This picture shows how the subs are stacked behind the mains:

 

20160218_205351_zpsuoujsaup.jpg

 

 

Currently there's about 4" from the wall to the sealed subs, and 6" between the sealed subs and the mains.  With the ported cabs being 22.5" wide and two would be stacked side by side behind the mains, I'm going to squeeze everything closer together.

 

Best case I only have to move the mains/tv/center forward about 15", which would only leave about 6' between them and the front row.  



#13 Rowan611

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Posted 20 September 2016 - 04:54 PM

That's really close to the front Luke, it'll be like sitting in the front row at a movie theater. :)
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#14 Ricci

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Posted 21 September 2016 - 05:04 PM

Your mains are 30" deep! :o Yeesh. 6ft of floor space being used.



#15 lukeamdman

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Posted 21 September 2016 - 06:53 PM

Your mains are 30" deep! :o Yeesh. 6ft of floor space being used.

 

Yeah, and over 7ft with the ported subs. 



#16 Infrasonic

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Posted 21 September 2016 - 10:50 PM

Yeah, and over 7ft with the ported subs. 

 

Haha!

 

I remember those days.

 

inroomscaleme.jpg


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#17 lukeamdman

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Posted 22 September 2016 - 01:50 AM

Haha!

 

I remember those days.

 

inroomscaleme.jpg

 

I'm still bummed you sold those!

 

Because of my soffits I'm limited to 81" of height, hence the 28.5" height of the ported boxes planned (28.5 + 28.5 + 24 (Othorns on their side)) = 81.

 

The 7ft I was referring to earlier is how much space of the front of my room will be consumed by the subs and mains.  From the back wall to the front of the mains will be around 86-87"!



#18 Infrasonic

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Posted 22 September 2016 - 02:47 AM

Oh my!



#19 Rowan611

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Posted 22 September 2016 - 03:27 AM

Haha!
 
I remember those days.
 
inroomscaleme.jpg


Sweet!

#20 lukeamdman

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Posted 22 September 2016 - 03:56 AM

Sweet!

 

That build of Scott's is what started me on the DIY path!






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