(8) Ported Incriminator Audio Judge 21" build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 528 Old 02-14-2017, 07:14 PM - Thread Starter
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(8) Ported Incriminator Audio Judge 21" build

Current dual-opposed sealed build with these drivers:

https://www.avsforum.com/forum/155-di...-21-build.html


I'm currently building 8 of these:

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













1/2" round over:

















Tune came in at 14hz:





All 8 + the Othorns stacked behind the mains:

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Last edited by lukeamdman; 01-15-2018 at 11:57 AM.
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post #2 of 528 Old 02-14-2017, 07:14 PM - Thread Starter
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T/S specs for the drivers. I will add...I didn't secure/bolt down the driver when getting these parameters, and Ricci told me that will cause the BL to come in a little lower.


Re = 2.8983 ohms
Fs = 31.2837 Hz
Zmax = 64.4377 ohms
Qes = 0.5802
Qms = 12.3192
Qts = 0.5541
Le = 4.2938 mH (at 1 kHz)
Diam = 454.1638 mm ( 17.8805 in )
Sd = 162000.0005 mm^2(251.1005 in^2)
Vas = 142.7929 L ( 5.0427 ft^3)
BL = 25.7591 N/A
Mms = 675.7605 g
Cms = 38.3012 uM/N
Kms = 26108.8594 N/M
Rms = 10.7822 R mechanical
Efficiency = 0.7080 %
Sensitivity= 90.5184 dB @1W/1m
Sensitivity= 94.9278 dB @2.83Vrms/1m
Krm = 28.598E-03 ohms Freq dependent resistance
Erm = 784.948E-03 Rem=Krm*(2*pi*f)^Erm
Kxm = 272.943E-03 Henries Freq dependent reactance
Exm = 525.888E-03 Xem=Kxm*(2*pi*f)^Exm
;------------------------------------------------------------------
Ftest = 25.919 Hz
Ftest/Fms = 0.8285
Test Mass used = 308.6900 g (Equal to 61.7 nickels)
Test Mass (Ft=Fms*0.90) = 158.512 g (Add -150.178g for Ft=28.155)
Test Mass (Ft=Fms*0.75) = 525.592 g (Add 216.901g for Ft=23.463)

Last edited by lukeamdman; 01-07-2018 at 03:49 PM.
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post #3 of 528 Old 02-14-2017, 07:15 PM - Thread Starter
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Two are done and I'm applying the Duratex, and @dsl1 CNC cut the baffles for the remaining 6 boxes.






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post #4 of 528 Old 02-14-2017, 07:20 PM
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(8) Ported Incriminator Audio Judge 21" build

Wow 8 of these, your room is going to be insane. The bracing looks great in the cabinet. Subscribed
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post #5 of 528 Old 02-14-2017, 07:25 PM - Thread Starter
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Quote:
Originally Posted by eng-399 View Post
Wow 8 of these, your room is going to be insane. The bracing looks great in the cabinet. Subscribed
Initial SPL testing with one cab indicates that with all 8 I'll be approaching 148-150db from 15-20hz!
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post #6 of 528 Old 02-14-2017, 08:11 PM
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Looking good Luke! I can't wait to come up and hear them.
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post #7 of 528 Old 02-14-2017, 08:15 PM
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Quote:
Originally Posted by lukeamdman View Post
Initial SPL testing with one cab indicates that with all 8 I'll be approaching 148-150db from 15-20hz!
How big is your room?

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post #8 of 528 Old 02-14-2017, 08:16 PM
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Will be fun watching this come together. Subscribed.

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Just WOW!!!
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post #10 of 528 Old 02-14-2017, 08:26 PM - Thread Starter
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Quote:
Originally Posted by stsand View Post
How big is your room?

Sent from my XT1575 using Tapatalk
About 2,300cu.ft. 12'x23' with 8ft ceilings.
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post #11 of 528 Old 02-14-2017, 08:48 PM
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Originally Posted by lukeamdman View Post
About 2,300cu.ft. 12'x23' with 8ft ceilings.
Same size as mine. I've got two 21s, and it thumps pretty good in there. 8 is just mind blowing...

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post #12 of 528 Old 02-14-2017, 08:55 PM - Thread Starter
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Quote:
Originally Posted by stsand View Post
Same size as mine. I've got two 21s, and it thumps pretty good in there. 8 is just mind blowing...

Sent from my XT1575 using Tapatalk
Two of these ported is producing more SPL from 12-20hz than all 8 could sealed.

These cross over to dual Othorns at around 30hz, so once these ported boxes are finished I'll be around 145db from 14-150hz:




Most I've hit in the room at the LP so far (I use the "max" value so I consider this 147db):

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post #13 of 528 Old 02-14-2017, 08:58 PM
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How big is your room?
Not sure if that's the correct question


How close are your neighbors?
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post #14 of 528 Old 02-14-2017, 09:48 PM - Thread Starter
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Originally Posted by NC25T View Post
Not sure if that's the correct question


How close are your neighbors?
Fortunately for me my HT is completely below ground level. You can hear it outside (mostly noises from my house rattling) but I doubt you can hear it once inside one of the neighbors houses.
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post #15 of 528 Old 02-15-2017, 06:36 AM
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Originally Posted by lukeamdman View Post
Fortunately for me my HT is completely below ground level. You can hear it outside (mostly noises from my house rattling) but I doubt you can hear it once inside one of the neighbors houses.
Lmao. I bet it's heard quite further than you would think especially at night when all is quiet.
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post #16 of 528 Old 02-15-2017, 06:44 AM
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Quote:
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Initial SPL testing with one cab indicates that with all 8 I'll be approaching 148-150db from 15-20hz!
Crazy bastard!
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gotta see this ............
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Same size as mine. I've got two 21s, and it thumps pretty good in there. 8 is just mind blowing...

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10 if you count Luke's two iPals in the Othorns.

It was crazy in there with the 21s sealed, in these monsters....well I'm really looking forward to demo clips. Especially some of the lower stuff.
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gotta see this ............
"OK guys I'll turn it up for a demo, hang on..."
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Lmao. I bet it's heard quite further than you would think especially at night when all is quiet.
In the past I have asked my neighbors if they heard anything, and they hadn't, but after this build I may have to inquire again

I have awesome neighbors, so even if they did occasionally hear something I doubt they'd care.
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post #22 of 528 Old 02-15-2017, 12:27 PM
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Is this still a thing?

I would have thought you would have moved on to passive radiators by now.
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Is this still a thing?

I would have thought you would have moved on to passive radiators by now.
Been there done that

Besides the extra cost I really liked the dual PR sub!
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This is just plain UNFAIR.. Like Really Unfair.. WHY? WHY? ... Yes I'm Jealous..
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Quote:
Originally Posted by lukeamdman View Post
Fortunately for me my HT is completely below ground level. You can hear it outside (mostly noises from my house rattling) but I doubt you can hear it once inside one of the neighbors houses.
I vibrate my neighbors house so don't assume.

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Subed... all pun intended.

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Please delete duplicate

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Quote:
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"OK guys I'll turn it up for a demo, hang on..."
LMAO

Quote:
Originally Posted by lukeamdman View Post
In the past I have asked my neighbors if they heard anything, and they hadn't, but after this build I may have to inquire again

I have awesome neighbors, so even if they did occasionally hear something I doubt they'd care.
your going to have to worry about stuff falling off of their walls and shelves. been there, done that. "that" they will not like.

i used to live in an all concrete condo, ceiling, walls, floor. it had room gain like you would not believe. i would crank it up LOUD = anyone on this forum would be proud. only towards the end of me living there did i get any "feedback", lol. that was 1 reason i moved.
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