S P E C I F I C A T I O N S - JBL Decade L36 Instruction Manual

P E R F O R M A N C E
C H A R A C T E R I S T I C S

S P E C I F I C A T I O N S

2
r e s p o n s e a t t h e e x p e n s e o f e f f i c i e n c y , d y n a m i c r a n g e
t r a n s i e n t r e p r o d u c t i o n . E f f i c i e n c y i s i m p o r t a n t f o r t w o
r e a s o n s : i t p e r m i t s u s e o f a r e l a t i v e l y l o w p o w e r ,
m o d e r a t e l y p r i c e d a m p l i f i e r , a n d i t a l l o w s t h e a m p l i f i e r
t o o p e r a t e a t a l o w e r d i s t o r t i o n l e v e l , p r o v i d i n g t h e
r e s e r v e p o w e r n e c e s s a r y t o a c h i e v e f u l l d y n a m i c
a n d e x c e l l e n t t r a n s i e n t r e p r o d u c t i o n .
T h e D e c a d e 3 6 e x h i b i t s t h e s t r o n g b a s s , w e l l d e f i n e d
m i d r a n g e a n d s p a r k l i n g h i g h f r e q u e n c y r e p r o d u c t i o n
c h a r a c t e r i s t i c o f a l l J B L l o u d s p e a k e r s y s t e m s . H o w e v e r ,
t h e m o s t s t r i k i n g c h a r a c t e r i s t i c o f t h e s y s t e m i s i t s
e x c e p t i o n a l c l a r i t y . M o d e r n r e c o r d i n g s c o n t a i n a u d i t o r y
e f f e c t s t h a t c a n o n l y b e c a p t u r e d t h r o u g h t h e
• o f e l e c t r o n i c s a p p l i e d i n a r e c o r d i n g s t u d i o o r a t a l i v e
p e r f o r m a n c e — d e l i c a t e o v e r t o n e s c a p t u r e d b y c l o s e
m i c r o p h o n e p l a c e m e n t a n d c o m p l e x
p r o d u c e d b y e l e c t r o n i c s y n t h e s i s . S u c h s t a t e o f t h e a r t
t e c h n i q u e s , u s e d i n b o t h c o n t e m p o r a r y a n d c l a s s i c a l
r e c o r d i n g , p l a c e r i g o r o u s d e m a n d s o n e v e n t h e m o s t
s o p h i s t i c a t e d l o u d s p e a k e r s y s t e m s — d e m a n d s t h a t J B L
h a s a l w a y s m e t a n d
A n u m b e r o f l o u d s p e a k e r s y s t e m s c a n h a n d l e l a r g e
a m o u n t s o f p o w e r ; o t h e r s a r e h i g h l y e f f i c i e n t . J B L
p r o d u c t s a r e u n i q u e i n t h e i r a b i l i t y t o c o m b i n e
a t t r i b u t e s . T h e L 3 6 , f o r e x a m p l e , w i l l c o n v e r t a 1 - W a t t
i n p u t o f " w h i t e n o i s e "
o f 7 6 d B m e a s u r e d a t a d i s t a n c e o f 1 5 f e e t .
a p p r o x i m a t e l y t w i c e a s l o u d a s o r d i n a r y c o n v e r s a t i o n
a n d r e p r e s e n t s a c o m f o r t a b l e l i s t e n i n g l e v e l ,
d e m o n s t r a t i n g t h a t t h e L 3 6 d e l i v e r s s u b s t a n t i a l s o u n d
o u t p u t f r o m v e r y l i t t l e i n p u t p o w e r .
R a t h e r t h a n r e p e a t t h e a m b i g u i t y o f m o s t
s p e c i f i c a t i o n s , J B L h a s t r a d i t i o n a l l y r e f r a i n e d f r o m
l i s t i n g d a t a f o r w h i c h n o w i d e l y a c c e p t e d t e s t
h a s b e e n e s t a b l i s h e d . I n t h e a b s e n c e o f s u c h
a n y w e l l e q u i p p e d l a b o r a t o r y c a n l e g i t i m a t e l y p r o d u c e a
v a r i e t y o f f r e q u e n c y r e s p o n s e c u r v e s f o r a l o u d s p e a k e r ,
1. "White noise" is a rigorous
program material under laboratory
controlled means of energizing
loudspeaker system
encompasses all audible
includes all the colors
the laboratory by a signal generator,
very much like the hiss heard between
2. A decibel (dB), in this context,
loudness of sound.
smallest change in loudness
detectable by the human
s u r p a s s e d .
i n t o a s o u n d p r e s s u r e l e v e l
1
test simulating
conditions.
all the transducers
simultaneously. "White
frequencies just as white
of the visible spectrum.
"white
is a unit expressing
Three dB is approximately
of program
ear.
a n d
r a n g e
t e c h n o l o g y
h a r m o n i c s
b o t h
T h i s i s
2
t e c h n i c a l
p r o c e d u r e
s t a n d a r d s ,
average musical
It provides
of a
noise"
light
Produced in
noise" sounds
FM radio stations.
relative
equal to the
material ordinarily
a