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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => LAB Subwoofer Forum => Topic started by: Martin Bilecki on August 08, 2011, 09:20:08 pm

Title: Best way to employ 16 to 18 lab subs
Post by: Martin Bilecki on August 08, 2011, 09:20:08 pm
I am looking for some insight as to the best way to employ 16 to 18 lab subs at an outdoor rock show on a 40 foot deck ..   

 I have an EAw ux 8800   with 4 ins and 8 outs for sub processing and 6 PL340 QSc amps //...   

Blocks of 4 mouth to mouth with equal spacing and delay from in to out ???? 

Please don't make me stack 9 per side and have that power alley and nulls to deal with 

HELP  !!!!
Title: Re: Best way to employ 16 to 18 lab subs
Post by: Mac Kerr on August 08, 2011, 09:48:28 pm
I am looking for some insight as to the best way to employ 16 to 18 lab subs at an outdoor rock show on a 40 foot deck ..   

 I have an EAw ux 8800   with 4 ins and 8 outs for sub processing and 6 PL340 QSc amps //...   

Blocks of 4 mouth to mouth with equal spacing and delay from in to out ???? 

Please don't make me stack 9 per side and have that power alley and nulls to deal with 

HELP  !!!!

In his talk at the LAB Expo this year Dave Rat talked about a modified end fire array that used 1 (in your case 2) subs as the rear element to 2 or 3 other arrays an each side of the stage. By creating a wide cardioid pattern on each side the power ally summation was reduced by the amount the cardioid pattern falls off in the center. Using 2 LAB Subs as a block, 2 subs facing forward, 2 subs 45 out, and 2 subs 90 out, with 2 subs at the focal point of the 3 sub blocks, with the 6 front subs delayed to match the 2 rear subs will simulate Dave's concept as I remember it. If anyone remembers it differently or better, please chime in.

Mac
Title: Re: Best way to employ 16 to 18 lab subs
Post by: Jay Barracato on August 10, 2011, 12:59:41 pm
I am looking for some insight as to the best way to employ 16 to 18 lab subs at an outdoor rock show on a 40 foot deck ..   

 I have an EAw ux 8800   with 4 ins and 8 outs for sub processing and 6 PL340 QSc amps //...   

Blocks of 4 mouth to mouth with equal spacing and delay from in to out ???? 

Please don't make me stack 9 per side and have that power alley and nulls to deal with 

HELP  !!!!

Here is one of Dave Rat's blogs:

http://www.ratsound.com/cblog/archives/335-More-Homework.html

I just can't help but thinking that 18 lab subs stacked together would be bigger than some of the stages I have seen recently.
Title: Re: Best way to employ 16 to 18 lab subs
Post by: John Roberts {JR} on August 10, 2011, 01:31:26 pm
From a distance.

JR
Title: Re: Best way to employ 16 to 18 lab subs
Post by: Martin Bilecki on August 10, 2011, 02:51:19 pm
From a distance.

JR

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