User manual JBL SDEC 4500

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[. . . ] 7 SHIPPING TO THE NEXT DEALER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 KIT INVENT O RY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 HARDWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] F i r s t , we a c q u i r e t e s t d a t a , wh i c h a c c u r a t e l y r e p r e s e n t s wh a t i s a c t u a l l y h a p p e n i n g i n t h e r o o m . S e c o n d , we p r o c e s s t h i s d a t a t o c r e a t e a v i e w r e l e v a n t t o wh a t we h e a r . Th i r d , t h i s d a t a i s c o m p a r e d t o t h e t h e o r e t i c a l i d e a l . F i n a l l y , c o r r e c t i ve a c t i o n i s t a k e n t o m a k e t h e l i s t e n i n g e n v i r o n m e n t m o r e c l o s e l y m a t c h t h e i d e a l . Me a n i n g f u l a c o u s t i c m e a s u r e m e n t s c a n n o t b e a c c o m p l i s h e d b y p l a c i n g a m i c r o p h o n e a t a s i n g l e p o s i t i o n a n d r u n n i n g a t e s t . Th e k e y p r e m i s e o f r o o m e q u a l i z a t i o n a t l o w f r e q u e n c i e s i s t h a t t h e e q u a l i z a t i o n wi l l b e u s e d o n l y t o c o r r e c t r e s p o n s e e r r o r s c a u s e d b y r o o m r e s o n a n c e s . I t i s n o t u s e d t o c o r r e c t n a r r o w, d e e p , d i p s o r p e a k s c a u s e d b y d e s t r u c t i ve a c o u s t i c a l i n t e r f e r e n c e . A m e a s u r e m e n t m a d e a t a s i n g l e p o i n t c a n n o t d i s c r i m i n a t e b e t we e n r o o m m o d e r e s o n a n c e s a n d d e s t r u c t i v e i n t e r f e r e n c e . Th e o n l y e f f e c t i v e m e t h o d o f s e p a r a t i n g room resonances from interference is to sample the acoustic energy at several points in the room. ABOUT DATA ACQUISITION D A C S 4 e m p l o ys f i ve m i c r o p h o n e s , d i s t r i b u t e d t h r o u g h o u t t h e l i s t e n i n g a r e a . W h e n t h e d a t a a c q u i r e d f r o m t h e s e m i c r o p h o n e s i s s p a t i a l l y a v e r a g e d , t h e r e s u l t a n t c u r v e h a s e f f e c t i ve l y " a ve r a g e d o u t " m o s t o f t h e d e s t r u c t i v e i n t e r f e r e n c e c o m p o n e n t s wh i l e r e p o r t i n g r o o m m o d e s . Th i s i s b e c a u s e d e s t r u c t i ve i n t e r f e r e n c e p h e n o m e n a o c c u p y v e r y s m a l l s p a c e s wi t h i n t h e r o o m . I f y o u u s e d a d i f f e r e n t i n p u t , s e l e c t t h a t one. Tu r n o n t h e l a p t o p c o m p u t e r a n d wa i t f o r i t t o b o o t . W h e n b o o t - u p i s c o m p l e t e , t h e r e wi l l b e a m e s s a g e o n t h e s c r e e n a s k i n g i f t h e r e i s a n S D E C 1 0 0 0 / 2 5 0 0 i n t h i s s y s t e m . Th e c o m p u t e r wi l l p a u s e a t t h i s p o i n t , wa i t i n g f o r y o u r r e s p o n s e . D O N O T r e s p o n d a t t h i s t i m e . R a i s e t h e v o l u m e o f t h e P r o c e s s o r , l i s t e n i n g a s y o u d o f o r a n y a b n o r m a l n o i s e s . Th i s m i g h t b e h u m , p o p s , t i c k s , s i zzl i n g , h i s s i n g o r a n y o t h e r s o u n d , wh i c h i s a b n o r m a l o r u n e xp e c t e d . R e m e m b e r t h a t s o m e l o w- l e ve l h u m a n d h i s s i s n o r m a l , b u t i t s h o u l d b e q u i t e s u b t l e . C o n t i n u e until you reach 0dB. 3 Microphone Placement Th e D A C S 4 c a l i b r a t i o n k i t i n c l u d e s f i v e m i c r o p h o n e s . P r o p e r m i c r o p h o n e p l a c e m e n t i s c r u c i a l to the success of your calibration efforts. Th e p r i m a r y p o s i t i o n i s t h e s e a t t h a t i s m o s t o f t e n o c c u p i e d . S t a r t b y p l a c i n g a m i c r o p h o n e i n t h e p r i m a r y l i s t e n i n g p o s i t i o n , a t e a r l e v e l . [. . . ] F r o m t h e P r o g r a m Ma n a g e r , c l i c k F i l e , t h e n R u n Ty p e A : l o a d e r i n t h e e n t r y f i e l d . Ty p e A : l o a d e r i n t h e e n t r y f i e l d . Press R Th i s p r o c e s s m a y t a k e a f e w m i n u t e s . W h e n t r a n s m i s s i o n t o t h e S D E C i s c o m p l e t e a n d t h e s e t t i n g s h a v e b e e n b u r n e d i n t o m e m o r y , a " D O N E " d i a l o g b o x wi l l p o p - u p . [. . . ]

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