Sony STR-DE598 Operating Instructions Manual page 29

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Playback channel indicators: The letters
(L, C, R, etc.) indicate the channels being
played back. The boxes arotmd the letters vary
to show how the receiver downmixes the
source sound (based on the speakers settings).
L (Front Left), R (Front Right), C (Center
(monaural)), SL (Sttrround Left), SR
(Surround Right), S (Surround (monaural or
the sarround components obtained by Pro
Logic processing)), SB (Sttrround Back (the
surround back components obtained by 6.1
channel decoding))
Example:
Recmding fomlat (Front/Surround): 3'2
Output chatmel: When the sluround speakers size
parameter is set to "NO"
Sound Field: A.F.D. AUTO
1>
3
"a
O
SL SR
29Gs