Sony HT-Z9F Operating Instructions Manual page 64

 Press  or  + on the remote control
to cancel the muting function
(page 12).
 Make sure the input source is
selected correctly. You should try
other input sources by pressing the
input select button on the remote
control (TV/HDMI1/HDMI2/ANALOG/
USB/BLUETOOTH) (page 12).
 Check that all the cables and cords of
the system and connected device are
firmly inserted.
 When you play content compatible
with copyright protection technology
(HDCP), it may not be output from the
system.
 Set
[Setup] - [Advanced Settings]
- [HDMI Settings] - [HDMI Signal
Format] to [Standard format]
(page 22).
The surround effect cannot be
obtained.
 Depending on the input signal and
the sound mode setting, surround
sound processing may not work
effectively. The surround effect may
be subtle, depending on the program
or disc.
 To play multi-channel audio, check
the digital audio output setting on
the device connected to the system.
For details, refer to the operating
instructions supplied with the
connected device.
Subwoofer
No sound or only a very low-level
sound is heard from the subwoofer.
 Press SW  + on the remote control
to increase the subwoofer volume
(page 46).
 Make sure that the power indicator
on the subwoofer is lit in green.
 If the power indicator on the
subwoofer does not light, try the
following.
64
GB
– Make sure the AC power cord
(mains lead) of the subwoofer is
connected properly.
– Press  (power) of the subwoofer
to turn on the power.
 If the power indicator on the
subwoofer flashes slowly in green or
lights in red, try the following.
– Move the subwoofer to a location
near the main unit so that the power
indicator on the subwoofer lights in
green.
– Follow the steps in "Connecting the
Subwoofer and Rear Speakers
Wirelessly" (page 29).
– Check the wireless connection
status (page 56).
 If the power indicator on the
subwoofer flashes in red, press 
(power) of the subwoofer to turn off
the power and check whether the
ventilation holes of the subwoofer is
blocked or not.
 If the input sources contain very little
bass sound components (i.e., a TV
broadcast), the sound from the
subwoofer may be difficult to hear.
You can check the subwoofer sound
by emitting the test tone (page 52).
 Set the night mode to off. For details,
see "Enjoying Clear Sound with Low
Volume at Midnight (NIGHT)"
(page 45).
 If you change the [RF Channel] setting
from [Off] to [On] (page 31), it may
take 1 minute for the sound to be
output.
Sound skips or has noise.
 If there is a device nearby that
generates electromagnetic waves,
such as a wireless LAN or a
microwave oven in use, locate the
system apart from it.
 If there is an obstacle between the
main unit and the subwoofer, move
or remove it.
 Locate the main unit and the
subwoofer as close as possible.