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Discussion Starter #1 (Edited)

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Discussion Starter #2 (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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Discussion Starter #3 (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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Discussion Starter #5
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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Looking good Luke! I can't wait to come up and hear them.
 
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:eek::eek::eek::eek::eek::eek::eek:

Just WOW!!!
 
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Discussion Starter #12 (Edited)
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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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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Discussion Starter #14
Not sure if that's the correct question


How close are your neighbors? :eek:
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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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. :D

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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Your builds make me happy.
 
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