ALLEN & HEATH GL2400 - Using the Channel Direct Outputs; Using the Stereo Channels; A Note about Combining Signals

GL2400!1234!5#&63! !! !! ! ! ! ! ! !!!!!! !!!!!!CF!
,
L8'-@,)G*,:G/--*C,<'0*:),"9)49)8!!!I3M(#%)!M(')*4?!23))&+=!&2!
943Z&+234)N!943Z<fN!943ZM(63!2*!)8()!?*#4!%&@3!M(634!:&_&+=N!3MM3')2!(+6!
<f!6*!+*)!(MM3')!)83!43'*46&+=J!!>8(+=3!)8&2!)*!9*2)Z<f!#2&+=!&+)34+(%!
[#:9342!&M!?*#!943M34!)*!#23!)83!<f!M*4!2*#4'3!'*443')&*+!(MM3')&+=!)83!
43'*46&+=!)**J!!c*#!'*#%6!(%2*!9()'8!ITX!^17!&+)*!(!:()4&_!<g7!TK!)*!
(66!(!i:*43!:3S!'8(++3%!&+)*!(!:*+&)*4!23+6!'43()36!M4*:!)83!=4*#92!
(+6! GXJ! !TM! 943M34436! ?*#! '(+! 43'*+M&=#43! )83! 6&43')! *#)9#)2! )*! 9*2)Z
M(63! $?! 23))&+=! &+)34+(%! [#:9342J! ! 123! 9*2)! M*4! M336&+=! (+! 3MM3')2!
94*'322*4! ;&)8! *+3! 2*#4'3! *+%?N! M*4! 3_(:9%3! (! 636&'()36! 43@34$! *+!
%3(6!@*'(%2N!*4!)*!(66!:*43!*M!*+3!2*#4'3!&+)*!(!:()4&_!M36!43'*46&+=J!
!
L8'-@, )G*, 6)*0*5, JG/--*C8!!!\)343*!'8(++3%2!F-!(+6!FD!
94323+)! (! #+&P#3! M%3_&$&%&)?J! ! <('8! 94*@&632! (! :&'4*98*+3! &+9#)! (+6!
);*! 2)343*! &+9#)2N! (! )*)(%! *M! M&@3! '*++3')&*+2! ;8&'8! '(+! M336! )83!
'8(++3%!*4!$3!4*#)36!3%23;8343J!!783!:&'!943(:9!8(2!(!7X\![('W!QT>!
^17! $43(W9*&+)! 2*! )8()! &)2! *#)9#)! '(+! $3! #236! &+6393+63+)%?J!!
"%#==&+=! &+)*!)8&2! 2*'W3)! $43(W2!)83! 2&=+(%! 9()8! M336&+=! )83!'8(++3%!
(+6!4*#)32!&)!)*!)83![('W!&+2)3(6J!!<('8!2)343*!&+9#)!8(2!&)2!*;+!%3@3%!
'*+)4*%!(+6!'(+!$3!4*#)36!3&)834!&+)*!)83!'8(++3%!*4!6&43')%?!)*!)83!GX!
:&_J!!78&2!&2!'*+M&=#436!#2&+=!(!43'32236!:*63!2;&)'8!;8&'8!94*)3')2!
&)!M4*:!(''&63+)(%!*934()&*+! 6#4&+=!(! 28*;J!! a&)8!0! :&'!(+6! O! 2)343*!
%&+3! &+9#)2N! '8(++3%2! F-! (+6! FD! 94*@&63! M*4! (! 8*2)! *M! 29('3! 2(@&+=!
(99%&'()&*+2Y!
6)/-+/0+,K5-5,K':054G5-*,JG/--*C8!!!Q*+*!:&'!&+9#)!)84*#=8!)83!
'8(++3%! ;&)8! O$(+6! <fN! (#_32! (+6! M#%%! 4*#)&+=J! ! "4322! )83! :*63!
2;&)'832! )*! 43Z4*#)3! )83! 2)343*! &+9#)2! 6&43')! )*! GX! M*4! 2&:9%3! 3MM3')2!
43)#4+2!(+6!2*#4'3!&+9#)2J!
#09*, 6)*0*5, K':054G5-*, JG/--*C!!!]*4!3_(:9%3N!#23!28*4)![('W!
%3(62!)*!9()'8!$*)8!'8(++3%!F-!(+6!FD!QT>!^17!$43(W9*&+)2!&+)*!\70!
2)343*!%&+3!&+9#)J!!\3)!\70!%3@3%!'*+)4*%!)*!&)2!:&6!iL6bS!9*2&)&*+!)*!M336!
)83!'8(++3%J! !,6[#2)!)83! =(&+!(+6!$(%(+'3! $3);33+!)83! %3M)!(+6! 4&=8)!
:&'4*98*+32!#2&+=!)83!);*!:&'!5,TK!'*+)4*%2J!!X*#)3!\7F!)*!GX!(2!(!
2&:9%3!3MM3')2!43)#4+!*4!2*#4'3!&+9#)J!!783!*)834!'8(++3%!'(+!$3!#236!
(2! (!6#(%! 2)343*! &+9#)! M36!M4*:! \7CBON! *4!(2! (! 2&+=%3!\7O! &+9#)! ;&)8!
\7C!4*#)36!&+6393+63+)%?!)*!GXJ!
K'P'-@, #?5, K':054G5-*8, )G059@G, "-*, JG/--*C!!!,2!($*@3!$#)!
9()'8!>RF-!QT>!^17!&+)*!\7F!GBQN!(+6!'8(++3%!FD!QT>!^17!&+)*!\70!
GBQJ!!\3)!\7F!(+6!0!%3@3%2!)*!:&6!iL6bS!9*2&)&*+J!!78&2!:&_32!)83!);*!
:&'2!)*=3)834!&+! :*+*N!M*4!3_(:9%3! ;83+!#2&+=! *+3!'8(++3%!M*4! );*!
'8*&4!:&'4*98*+32J!!>RFD!&2!(@(&%($%3!M*4!2)343*!%&+3!2*#4'32J!
>/):G/EC*, K':054G5-*, >0*/(4C'7'*0!!!I&2'*++3')!)83!:&'!943(:9!
M4*:! )83! '8(++3%! (+6! 9()'8! &)! 3%23;8343! )*! $3! #236! &+6393+63+)%?J!!
]*4! 3_(:9%3N! 9%#=! &+! (! 4**:! :&'4*98*+3! (+6! 9()'8! QT>! ^17! )*! (!
:()4&_!<g7!TK!)*!(66!(:$&3+'3!)*!(!43'*46&+=!*4!:*+&)*4!M336N!*4!#23!
&)! (2! (! 943(:9%&M&34! M*4!(! 43M343+'3!:&'4*98*+3! ;&)8! (+! X7,! *4!*)834!
(+(%?2&2! 3P#&9:3+)J! ! c*#! '*#%6! 3@3+! #23! &)! )*! 94*@&63! (! $3))34! :&'!
2*#4'3!)*!(!@&63*!'(:34(!*4!*)834!43'*4634J!
<9/C,6)*0*5, &'-*, 3-49)8!!!,!)4(63:(4W!*M!,%%3+!E!R3()8!'*+2*%32!&2!
)83!($&%&)?!)*!'*:$&+3!:*43!)8(+!*+3!2*#4'3! &+)*! )83!2)343*!'8(++3%N!
3('8! ;&)8! &)2! *;+! %3@3%! '*+)4*%J! ! 78&2! '(+! 2(@3! '8(++3%! 29('3! ;83+!
;*4W&+=! ;&)8! );*! 2&:&%(4! 2*#4'32! 4*#)36! )*! )83! 2(:3!632)&+()&*+N! M*4!
3_(:9%3N!);*!2)343*!43@34$!43)#4+2N!);*!$('W&+=!)4('W!*4!2*#+6!3MM3')2!
9%(?342N! *4! )*! (%)34+()3! $3);33+! ;(%WZ&+! :#2&'! (+6! 43'*4636!
(++*#+'3:3+)!9%(?342J!
!
M'-/CC2i,F,!5)*,/E59),J5(E'-'-@,6'@-/C8!!!c*#!'(+!#23!(!
icS!29%&))34!'($%3!*4!(6(9)34!)*!M336!*+3!*#)9#)!)*!);*!632)&+()&*+2N!$#)!
+3@34! )4?! )*! '*:$&+3! );*! *#)9#)2! )*! *+3! 632)&+()&*+J! ! 78&2! :(?!
6(:(=3!*4!63=4(63!)83!934M*4:(+'3!*M!)83!3P#&9:3+)!64&@34!2)(=3J!
DIRECT
OUT
24
MIC OUT
ST4 ST3 ST2 ST1
R
L/M
1516
MIC OUT
R
L/M
R
L/M
R
L/M
MIC INMIC IN
1516
(BREAKPOINT)
6
GAIN
20
60
50
40
30
+48V
GAIN
20
60
50
40
30
+48V
LR
-5
O
-10
-20
5
O
10
16
0
LR
MIC
ST2
LR
STEREO
MIC
LR
ST1
STEREO
ST4
STEREO
ST3
STEREO
CH15
CH15 CH16
CH16
6
-5
O
-10
-20
5
O
10
16
0
-5
O
-10
-20
5
O
10
16
0
-5
O
-10
-20
5
O
10
16
0