Yamaha HTR-5940 AV - Manual (Page 163)

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If the source being played is stopped and the input signal is
cut off for 7 to 8 minutes, the subwoofer automatically
switches to the standby mode. (When the subwoofer
switches to the standby mode by the automatic power-
switching function, the power indicator lights up in red.)
When you play a source again, the power of the subwoofer
turns on automatically by sensing audio signals input to the
subwoofer.
This function operates by sensing a certain level of low
frequency input signal. Usually set the AUTO STANDBY
switch to the LOW position. However, if this function does
not operate smoothly, set the switch to the HIGH position.
In the HIGH position, the power will turn on even with a
low level of input signal. But please be aware that the
subwoofer may not switch to the standby mode when there
is an extremely low input signal.
* The power might turn on unexpectedly by sensing noise
from other appliances. If that occurs, set the AUTO
STANDBY switch to the OFF position and use the
STANDBY/ON button to switch the power between on
and to the standby mode manually.
This function detects the low-frequency components
below 200 Hz of the input signals (i.e., the explosion in
the action movie, the sound of the bass guitar or the bass
drum, etc.).
* The minutes required to switch the subwoofer to the
standby mode might change by sensing noise from other
appliances.
This function is available only when the power of the
subwoofer is on (by pressing the STANDBY/ON
button).
AUTOMATIC POWER-SWITCHING FUNCTION
YST-SW315_215_03.25UB.fm Page 15 Tuesday, April 15, 2003 12:05 PM