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(8) Ported Incriminator Audio Judge 21" build


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#41 Infrasonic

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Posted 25 October 2016 - 04:43 PM

Ehh. No reason to have to build something new after wrapping up the sealed project. Live with it for a while. Enjoy the fruits of your labor and some extra money in your pocket. :)


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#42 lukeamdman

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Posted 26 October 2016 - 04:03 PM

Ehh. No reason to have to build something new after wrapping up the sealed project. Live with it for a while. Enjoy the fruits of your labor and some extra money in your pocket. :)

 

Yeah that's the other thing.  It sounds pretty dang good as is!



#43 Ricci

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Posted 26 October 2016 - 04:52 PM

Right on. Hard to get motivated for a whole lotta work when everything is setup and kicking ass already.


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#44 lukeamdman

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Posted 20 November 2016 - 11:30 PM

Right on. Hard to get motivated for a whole lotta work when everything is setup and kicking ass already.

 

Numbers like this make it really hard to get motivated :D

 

GTG_zpsy8ilttlj.png

 

 

Captured that during a GTG yesterday. 



#45 Ricci

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Posted 21 November 2016 - 03:25 PM

119dB not bad. :P


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#46 maxmercy

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Posted 21 November 2016 - 08:19 PM

Skip the mega-enclosures and get some Crowsons.  I initially thought I would have to double up on subwoofer enclosures and amps until I bought a set.  

 

JSS


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#47 lukeamdman

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Posted 21 November 2016 - 09:28 PM

Skip the mega-enclosures and get some Crowsons.  I initially thought I would have to double up on subwoofer enclosures and amps until I bought a set.  

 

JSS

 

99% sure that's what I'm doing next. 



#48 lukeamdman

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Posted 22 November 2016 - 04:22 AM

Skip the mega-enclosures and get some Crowsons.  I initially thought I would have to double up on subwoofer enclosures and amps until I bought a set.  

 

JSS

 

 

99% sure that's what I'm doing next. 

 

Yep...just ordered some Crowsons. 


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#49 Ricci

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Posted 22 November 2016 - 04:10 PM

Yep...just ordered some Crowsons. 

 

You have issues. LOL

 

This is probably a good move for you. Moving to giant ported cabs would've been a ton of work for questionable reasons. How often are you running out of headroom with the 8 21's below 20Hz? I'd guess VERY rarely and only when demoing the most abusive material way beyond regular listening levels. Crowson's will probably up the amusement park ride factor a whole lot more for a whole lot less work.



#50 lukeamdman

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Posted 22 November 2016 - 05:08 PM

You have issues. LOL

 

This is probably a good move for you. Moving to giant ported cabs would've been a ton of work for questionable reasons. How often are you running out of headroom with the 8 21's below 20Hz? I'd guess VERY rarely and only when demoing the most abusive material way beyond regular listening levels. Crowson's will probably up the amusement park ride factor a whole lot more for a whole lot less work.

 

Even with 7db of boost at 10hz I haven't seen the amps clip below 20hz yet, and that's at or above reference with the subs 20db hot during demoes.  During "normal" movie watching levels (-5 to -10 on the main dial) without the bass running stupid hot, cone excursion isn't visible on any driver in my HT. 

 

From what I've gathered from a few other members, that boost at 10hz will be removed the second these Crowsons are installed. 



#51 Ricci

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Posted 22 November 2016 - 07:50 PM

From what I've gathered from a few other members, that boost at 10hz will be removed the second these Crowsons are installed. 

 

Nah...Just need to keep the subs boosted but the Crowson's not. 2 separate signals FTW.



#52 lukeamdman

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Posted 22 November 2016 - 08:05 PM

Nah...Just need to keep the subs boosted but the Crowson's not. 2 separate signals FTW.


Definitely separate signals.

I get plenty of vibration above 20hz, so i may just 25hz LPF these things. Plenty of experimenting to do.

#53 maxmercy

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Posted 23 November 2016 - 02:27 AM

I settled on an LR2 crossover at the same freq I use as a cross from subs to LCRS. Seamless. To verify, I played back a ton of music I was familiar with changing freq and slope and settled on 100Hz LR2.

JSS

#54 maxmercy

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Posted 21 December 2016 - 02:09 PM

How is the crowson experimentation coming along?

JSS

#55 lukeamdman

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Posted 21 December 2016 - 10:52 PM

How is the crowson experimentation coming along?

JSS

 

http://data-bass.ipb...-build/?p=15300

 

 

Bottom line, Crowsons rock.  



#56 lukeamdman

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Posted 14 January 2017 - 08:06 PM

ANNNNDDDD...I'm thinking about this again...

 

Changing the box size, bumping the tune to 15hz, and placing them back to back I can get by with moving the front row forward only 6".  

 

Outside dimensions:

 

36" wide, 28.5" tall, and 30" deep (includes double baffle) is 14.95cu.ft.  Ports: (3) 8.5" x 2.625" about 57" long

 

After driver/bracing/port, net internal is  right at 11.5cu.ft.  With 3kw the port velocity maxes at 24m/s with a 14hz BW3 applied.  First port resonance is just over 100hz, but I'm currently crossing the sealed subs with the Othorns at 32hz so that's a non-issue even if it were much lower.  

 

I'll build one and see how it performs.

 

I was looking at the Cap4000ULF, and these will only give up about 1cu.ft internal, will have less driver displacement, more port volume, and tuned half an octave higher.  



#57 maxmercy

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Posted 15 January 2017 - 02:08 AM

Sounds like someone needs more Crowsons, or multiple rotary subs.

 

JSS



#58 lukeamdman

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Posted 15 January 2017 - 07:07 PM

Sounds like someone needs more Crowsons, or multiple rotary subs.

 

JSS

 

I'm back to where I was with the quad sealed 5400s.  <15hz just doesn't do anything for me on a concrete slab, so I'd rather gain SPL and lower distortion above that.  

 

The Crowsons are awesome so what would I miss by doing this?  



#59 dgage

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Posted 15 January 2017 - 10:58 PM

Sounds like someone needs more Crowsons, or multiple rotary subs.
 
JSS


Who here has ever heard a rotary sub? Or has anyone seen measurements for a rotary sub?

David Gage
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"You don't listen to our subs, you EXPERIENCE them!"


#60 shadyJ

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Posted 15 January 2017 - 11:27 PM

I don't think the rotary subs are able to be comparatively measured against other subwoofers since they are basically home installations. It would be interesting to see what they can do though, even if in-room. 






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