Setup
XMV4280/XMV4140 Owner’s Manual 17
Checking the wiring
Here we’ll explain how to change the attenuation settings
and switch muting on/off, which you will need to do when
checking the wiring.
Before you check the wiring, we recommend that you set the
attenuator of all channels to the lowest setting (-99 dB) to
prevent speaker damage.
To check the wiring, you’ll need to be outputting an audio
signal from the mixer or other device that’s connected to the
analog input connectors.
Changing the attenuator setting
Here’s how to change the attenuator setting.

1. While holding down the [FUNCTION] but-

ton, turn the encoder to make the display

indicate “ATT.”

2. Press the [SELECT] button of the channel

whose setting you want to adjust.

The [SELECT] indicator of the selected channel will
light.

3. Turn the encoder to gradually raise the

attenuator setting from -99, and verify

that sound is produced from the speaker.

Switching the mute setting on/off

While holding down the [MUTE] button,

press the [SELECT] button of the channel

that you want to control.

When mute is on, the [MUTE] indicator will light; when
mute is off, the [MUTE] indicator will be unlit.
Lowering the brightness of the indicators

and the display

If the front panel LED indicators are too bright, you can
lower their brightness.
After turning the power off, set the rear panel device setup
DIP switch 4 (LED DIMMER) to the lower position (ON).
The next time you turn the power on, the unit will start up
with decreased indicator brightness.
Locking the panel
By locking the panel you can disable front panel operations
other than controlling the power.
When this unit is used as part of an installed system, you can
lock down the settings by disabling operations from the front
panel, thus preventing inadvertent changes.
After turning the power off, set the rear panel device setup
DIP switch 5 (PANEL LOCK) to the lower position
(LOCK). The next time you turn the power on, the unit will
start up with the front panel locked.
Even in the locked state, you can temporarily defeat the
panel lock by pressing the [FUNCTION] button and the
[SELECT] A button. However, it will be re-locked when any
of the following conditions occur.
• One minutes elapses without any operation being per-
formed after the panel is temporarily unlocked
• You press the [FUNCTION] button and the [SELECT] A
button
• You turn the power off
The lock status is shown by the front panel [PANEL LOCK]
indicator.
• Locked: lit
• Not locked: unlit
• Temporarily unlocked: blinking
NOTE
If the speakers are remotely located and you are unable to
check the signal output easily, changing the [SIGNAL] indi-
cator setting to “output” will allow you to check whether cur-
rent is flowing to the speakers. For details on switching the
indicator setting, refer to “List of Front Panel Operations”
(page 20).
NOTE
The brightness of the [POWER] indicator will not be
reduced.