Yamaha RX-V457 Owner's Manual page 13

CONTROLS AND FUNCTIONS
K 96/24 indicator
Lights up when a DTS 96/24 signal is input to this unit.
L LFE indicator
Lights up when the input signal contains the LFE signal.
M Input channel indicators/speaker indicators
Indicate the channel components of the current digital
input signal.
Indicate the number of speakers connected in SPEAKERS
(page 23), or indicate the channel being adjusted in SP
LEVEL (page 57).
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