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(8) Ported Incriminator Audio Judge 21" build

46013 Views 527 Replies 68 Participants Last post by lukeamdman, May 8, 2019

lukeamdman

Discussion Starter · Feb 15, 2017 (Edited)

Current dual-opposed sealed build with these drivers:

http://www.avsforum.com/forum/155-diy-speakers-subs/2338649-8x-sealed-incriminator-audio-judge-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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lukeamdman

Discussion Starter · #2 · Feb 15, 2017 (Edited)

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)

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lukeamdman

Discussion Starter · #3 · Feb 15, 2017 (Edited)

Two are done and I'm applying the Duratex, and @dsl1 CNC cut the baffles for the remaining 6 boxes.

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eng-399

· #4 · Feb 15, 2017

(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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lukeamdman

Discussion Starter · #5 · Feb 15, 2017

eng-399 said:
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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Rowan611

· #6 · Feb 15, 2017

Looking good Luke! I can't wait to come up and hear them.

Reactions: 1

stsand

· #7 · Feb 15, 2017

lukeamdman said:
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?

Sent from my XT1575 using Tapatalk

stsand

· #8 · Feb 15, 2017

Will be fun watching this come together. Subscribed.

Sent from my XT1575 using Tapatalk

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Fattykidd

· #9 · Feb 15, 2017

Just WOW!!!

Reactions: 1

lukeamdman

Discussion Starter · #10 · Feb 15, 2017

stsand said:
How big is your room?

Sent from my XT1575 using Tapatalk

About 2,300cu.ft. 12'x23' with 8ft ceilings.

stsand

· #11 · Feb 15, 2017

lukeamdman said:
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...

Sent from my XT1575 using Tapatalk

lukeamdman

Discussion Starter · #12 · Feb 15, 2017 (Edited)

stsand said:
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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NC25T

· #13 · Feb 15, 2017

stsand said:
How big is your room?

Not sure if that's the correct question

How close are your neighbors?

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lukeamdman

Discussion Starter · #14 · Feb 15, 2017

NC25T said:
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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audiovideoholic

· #15 · Feb 15, 2017

lukeamdman said:
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.

Reactions: 1

jsgrise

· #16 · Feb 15, 2017

lukeamdman said:
Initial SPL testing with one cab indicates that with all 8 I'll be approaching 148-150db from 15-20hz!

Crazy bastard! :devil:

Reactions: 2

Fabricator

· #17 · Feb 15, 2017

gotta see this ............

Reactions: 1

Rowan611

· #18 · Feb 15, 2017

stsand said:
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

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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bpgunning

· #19 · Feb 15, 2017

Fabricator said:
gotta see this ............

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

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cubdenno

· #20 · Feb 15, 2017

Your builds make me happy.

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