JDK Audio R20 Owner's manual

Type
Owner's manual

This manual is also suitable for

JDK Audio R20 is a two-channel premium analog microphone preamplifier in a two-rack-space chassis. By using a continuously-variable gain control, the R20 can very precisely set the mic or instrument gain of the unit.

Each channel features both a mic and an instrument input and switches for phantom power, phase, and pad. Output levels are monitored via a custom analog VU meter, with an additional peak LED just above the gain control knob.

The R20 is designed to provide extremely wide gain range with very low noise and a solid front end for any audio system.

JDK Audio R20 is a two-channel premium analog microphone preamplifier in a two-rack-space chassis. By using a continuously-variable gain control, the R20 can very precisely set the mic or instrument gain of the unit.

Each channel features both a mic and an instrument input and switches for phantom power, phase, and pad. Output levels are monitored via a custom analog VU meter, with an additional peak LED just above the gain control knob.

The R20 is designed to provide extremely wide gain range with very low noise and a solid front end for any audio system.

J D K A U D I O
2 C H A N N E L
M I C R O P H O N E P R E A M P L I F I E R
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p r e m i u m a n a l o g m i c p r e a m p i n a t w o r a c k - s p a c e c h a s s i s . B y u s i n g a c o n t i n u o u s l y - v a r i a b l e g a i n c o n t r o l ,
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o n l y a c o m m o n O N / O F F s w i t c h .
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a n d p a d . O u t p u t l e v e l s a r e m o n i t o r e d v i a a c u s t o m a n a l o g V U m e t e r , w i t h a n a d d i t i o n a l p e a k L E D
j u s t a b o v e t h e g a i n c o n t r o l k n o b .
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a c k s .
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m i c r o p h o n e p r e a m p u t i l i z e s t h e T H A T C o r p . 1 5 1 2 M i c P r e a m p I C w i t h w a f e r t e c h n o l o g y p r o d u c i n g
n e a r - d i s c r e t e p e r f o r m a n c e . T h e R 2 0 o f f e r s a n e x t r e m e l y w i d e g a i n r a n g e w i t h v e r y l o w n o i s e a n d
d i s t o r t i o n . A l o n g w i t h t h e c o n v e n i e n t l y l o c a t e d f r o n t p a n e l I n s t r u m e n t i n p u t a n d t h e e l e c t r o n i c a l l y
b a l a n c e d T H A T C o r p . o u t p u t s t a g e , t h e R 2 0 i s a s o l i d f r o n t e n d f o r a n y a u d i o s y s t e m . T h e f r o n t p a n e l
i n c l u d e s a b a c k l i t a n a l o g m e t e r w i t h s e p a r a t e p e a k L E D , p h a n t o m p o w e r , p a d , a n d p h a s e s w i t c h f o r
e a c h c h a n n e l i n a r o b u s t 2 U c h a s s i s .
F R O N T P A N E L C O N T R O L S
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T h e f r o n t p a n e l p o w e r s w i t c h t u r n s p o w e r t o t h e R 2 0 o n a n d o f f .
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I N S T I N J A C K
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p o s i t i o n o f t h e s e l e c t o r s w i t c h i m m e d i a t e l y t o t h e l e f t o f t h e j a c k . T h e r e d L E D a b o v e t h e s w i t c h w i l l
N O T b e i l l u m i n a t e d w h e n t h e I N S T i n p u t i s s e l e c t e d .
M I C / I N S T S E L E C T O R S W I T C H
T h i s s w i t c h s e l e c t s e i t h e r t h e r e a r p a n e l M I C i n p u t o r t h e f r o n t p a n e l I N S T i n p u t . W h e n M I C i s s e l e c t e d ,
t h e L E D a b o v e t h e s w i t c h w i l l i l l u m i n a t e .
P H A S E S W I T C H
T h i s s w i t c h s e l e c t s e i t h e r n o r m a l ( X L R p i n 2 o r T R S t i p a s ' h o t ' o r p o s i t i v e ) o r t h e r e v e r s e . I f t h e
I N V ( I n v e r t e d ) p o s i t i o n i s s w i t c h e d , t h e L E D i m m e d i a t e l y a b o v e t h e s w i t c h w i l l i l l u m i n a t e .
P A D S W I T C H
T h i s s w i t c h i n s e r t s a p a d i n t o t h e s i g n a l f l o w i f s e l e c t e d . I f t h e M I C i n p u t i s b e i n g u s e d , t h e p a d i s
- 2 0 d B ; i f t h e I N S T i n p u t i s b e i n g u s e d , t h e p a d i s - 1 0 d B . W h e n t h e p a d s w i t c h i s a c t i v e , t h e L E D
i m m e d i a t e l y a b o v e t h e s w i t c h w i l l i l l u m i n a t e .
P H A N T O M P O W E R S W I T C H
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t h e L E D i m m e d i a t e l y a b o v e t h e s w i t c h w i l l i l l u m i n a
t e .
( 1 c h a n n e l s h o w n )
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T h i s k n o b a d j u s t s t h e g a i n o f t h e p r e a m p . T h e m i c p r e a m p s e c t i o n c a n p r o v i d e a m a x i m u m o f
5 5 d
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v a r i a b l e g a i n p o t , t h e g a i n o f t h e R 2 0 c a n b e p r e c i s e l y c o n t r o l l e d .
V U M E T E R
T h e c u s t o m a n a l o g V U m e t e r i n c o n j u n c t i o n w i t h t h e P E A K L E D o v e r t h e G A I N k n o b g i v e s t h e u s e r
a n e x c e l l e n t i n d i c a t i o n o f t h e o u t p u t g a i n f r o m t h e R 2 0
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a 1 / 4 " u n b a l a n c e d j a c k o n t h e f r o n t . T h e i n p u t X L R c o n n e c t o r i s w i r e d p i n 2 h o t ( o r + ) w i t h t h e P H A S E
s w i t c h i n t h e d o w n p o s i t i o n .
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T h e o u t p u t s o f t h e R 2 0 c a n b e t a k e n f r o m e i t h e r t h e 3 p i n X L R - t y p e c o n n e c t o r , o r v i a t h e 1 / 4 " b a l a n c e d
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p i n 2 h o t ( o r + ) , a n d t h e 1 / 4 " T R S c o n n e c t o r i s w i r e d t i p h o t ( o r + ) . T h e s e t w o c o n n e c t o r s a r e w i r e d i n
p a r a l l e l , s o o u t p u t a u d i o w i l l a p p e a r o n b o t h c o n n e c t o r s .
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e g r o u n d o f t h i s A C c o n n e c t o r i s
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y .
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s w i t c h i s i n t h e c o r r e c t p o s i t i o n f o r y o u r c o u n t r y a n d t h e a p p r o p r i a t e v
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u s e a 2 5 0 m A S l o - B l o f u s e .
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u s e w h e n c h a n g i n g t h e s u p p l y v o l t a g e .
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F o r l i n e v o l t a g e s f r o m 1 0 0 V t o 1
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v o l t a g e s f r o m 2 0 0 - 2 4 0 V o l t s .
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M a x G a i n : + 5 5 d b ( n o p a d ) , + 3 6 d b ( w / p a d )
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M a x G a i n : + 3 1 d b ( n o p a d ) , + 2 1 d b ( w / p a d )
M i n G a i n : + 1 0 d b ( n o p a d ) , 0 d b ( w / p a d )
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R a n g e : 2 1 d b
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D i m e n s i o n s : 2 U E I A
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W i d t h : 1 9 I n c h e s
D e p t h : 1 0 I n c h e s
W e i g h t : 1 2 l b s
( S p e c i f i c a t i o n s s u b j e c t t o c h a n g e w i t h o u t n o t i c e )
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a .
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n o t c o v e r c l a i m s f o r d a m a g e d u e t o a l t e r a t i o n a n d / o r a b u s e . T h i s w a r r a n t y i s l i m
i t e d t o f a i l u r e s d u r i n g n o r m a l u s e , w h i c h
a r e d u e t o d e f e c t s i n m a t e r i a l o r w o r k m a n s h i p . I f a n y d e f e c
t s a r e f o u n d i n t h e m a t e r i a l s o r w o r k m a n s h i p , o r i f t h e p r o d u c t
f a i l s t o f u n c t i o n p r o p e r l y d u r i n g t h e
a p p l i c a b l e w a r r a n t y p e r i o d , J D K A u d i o , a t i t s o p t i o n , w i l l r e p a i r o r r e p l a c e t h e p r o d u c t .
b .
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i o r e s e r v e s t h e r i g h t t o i n s p e c t a n y p r o d u c t s t h a t m a y b e t h e s u b j e c t o f a n y w a r r a n t y c l a i m s b e f o r e r e p a i r o r
r e p l a c e m e n t i s c a r r i e d o u t . F i n a l d e t e r m i n a t i o n o f w a r r a n t y c o v e r a g e l i e s s o l e l y w i t h J D K A u
d i o .
c .
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s e t h i s p r o d u c t w i t h i n t h e
a p p l i c a b l e w a r r a n t y p e r i o d . P r o o f o f p u r c h a s e m a y b e r e q u i r e d .
d .
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n s e r v i c e :
a .
C a l l J D K A u d i o c / o A P I a t 3 0 1 - 7 7 6 - 7 8 7 9 , 8 : 3 0 A M t o 5 P M M o n d a y t h r o u g h F r i d a y ( E a s t e r n T i m e ) t o g e t a R e t u r n
A u t h o r i z a t i o n ( R A ) . P r o d u c t s r e t u r n e d w i t h o u t a n R A n u m b e r m a y n o t b e a c c e p t e d .
b .
P a c k t h e d e f e c t i v e p a r t b y w r a p p i n g i n p l a s t i c a n d c u s h i o n i n g m a t e r i a l . S e a l s e c u r e l y i n a n a p p r o v e d s h i p p i n g c o n t a i n e r .
I f y o u d o n o t h a v e a s u f f i c i e n t s h i p p i n g c o n t a i n e r , a s k J D K A u d i o f o r a d v i c e w h e n
c a l l i n g f o r t h e R A n u m b e r .
c .
I n c l u d e a n o t e e x p l a i n i n g t h e p r o b l e m a n d c o n d i t i o n s o f t h e s e r v i c e r e q u e s t . I n c l u d e y o u r c o m p l e t e r e t u r n a d d r e s s ( n o
P . O . B o x e s , p l e a s e )
d .
S h i p t h e p r o d u c t f r e i g h t p r e p a i d t o :
J D K A u d i o c / o A P I
8 3 0 1 P a t u x e n t R a n g e R o a d
J e s s u p , M D 2 0 7 9 4
I M
P O R T A N T : B e s u r e t h e R A n u m b e r i s p l a i n l y w r i t t e n o n t h e s h i p p i n g c a r t o n
e .
T h i s i s y o u r s o l e w a r r a n
t y . J D K A u d i o d o e s n o t a u t h o r i z e a n y t h i r d p a r t y , i n c l u d i n g a n y d e a l e r o r s a l e s r e p r e s e n t a t i v e , t o
a s
s u m e l i a b i l i t y o n b e h a l f o f J D K A u d i o o r t o m a k e a n y w a r r a n t y f o r J D K A u d i o .
F . T H E W A R R A N T Y G I V E N O N T H I S P A G E I S T H E S O L E W A R R A N T Y G I V E N B Y J D K A U D I O A N D I S I N L I E U O F
A L L O T H E R W A R R A N T I E S , E X P R E S S A N
D I M P L I E D , I N C L U D I N G T H E W A R R A N T I E S O F M E R C H A N T A B I L I T Y
A N D F I T N E S S F O R A P A R T I C U L A R P U R P O S E . T H E W A R R A N T Y G I V E N O N T H I S P A G E S H A L L B E S T R I C T L Y
L I M I T E D I N D U R A T I O N T O O N E ( 1 ) Y E A R F R O M T H E D A T E O F T H E O R
I G I N A L P U R C H A S E F R O M J D K A U D I O
O R A N A U T H O R I Z E D J D K A U D I O D E A L E R . U P O N E X P I R A T I O N O F T H E A P P L I C A B L E W
A R R A N T Y P E R I O D
J D K A U D I O S H A L L H A V E N O F U R T H E R W A R R A N T Y O B L I G A T I O N O F A N Y K I N D . J D K A U D I O S H A L L N O T B
E
L I A B L E F O R A N Y I N C I D E N T A L , S P E C I A L , O R C O N S E Q U E N T I A L D A M A G E S T H A T M A Y R E S U L T F R O M A N Y
D E F E C T I N T H E
J D K A U D I O P R O D U C T O R A N Y W A R R A N T Y C L A I M .
G .
T h i s w a r r a n t y p r o v i d e s s p e c i f i c l e g a l r i g h t s a n d y o u m a y
h a v e o t h e r r i g h t s w h i c h v a r y f r o m s t a t e t o s t a t e .
J D K A u d i o P r o d u c t W a r r a n t y
I n a c o n s t a n t e f f o r t t o i m p r o v e t h e s u b t l e d e t a i l s o f o u r p r o d u c t s , s o m e a m o u n t o f c h a n g e i s i n e v i t a b l e .
J D K A u d i o r e s e r v e s t h e r i g h t t o m o d i f y o r c h a n g e a n y o f t h e f e a t u r e s , s p e c i f i c a t i o n s o r p e r f o r m a n c e o f o u r p r o d u c t s w i t h o u t n o t i c e o r o b l i g a t i o n .
J D K A u d i o i s a p r o d u c t l i n e d e s i g n e d a n d m a n u f a c t u r e d b y
A P I ( A u t o m a t e d P r o c e s s e s , I n c . )
8 3 0 1 P a t u x e n t
R a n g e R o a d , J e s s u p M D , 2 0 7 9 4
P h : 3 0 1 - 7 7 6 - 7 8 7 9 F a x : 3 0 1 - 7 7 6 - 8 1 1 7
w w w . J D K A u d i o . c o m
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JDK Audio R20 Owner's manual

Type
Owner's manual
This manual is also suitable for

JDK Audio R20 is a two-channel premium analog microphone preamplifier in a two-rack-space chassis. By using a continuously-variable gain control, the R20 can very precisely set the mic or instrument gain of the unit.

Each channel features both a mic and an instrument input and switches for phantom power, phase, and pad. Output levels are monitored via a custom analog VU meter, with an additional peak LED just above the gain control knob.

The R20 is designed to provide extremely wide gain range with very low noise and a solid front end for any audio system.

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