11
Operating Manual - nX, nXe, and nXp Power Amplifiers
4.4 Channel Attenuators
– These control the input signal level to the amplifier, and work in conjunction with the
remote DC fader level controls and the software control surface fader controls (if the amp is networked). When an input attenuator
is turned fully off, it's red Clip/Mute LED turns on and stays on to indicate mute status for that channel. The front panel attenuators
can be disabled, along with the power switch, using the factory reset switch as shown in
section 4.3
or using software.
4.5 Channel LED Indicators
BRIDGE
- This green LED indicates when the channel pair is configured to BRIDGE mode from the back panel
switch. Only the odd numbered input and level control for that channel pair is used.
TEMP
- This yellow LED turns on when an amplifier channel has reached an operating temperature that is 80% of it's
maximum safe range, and the cooling fan(s) are at their maximum speed. The LED lights dimly at first and will glow brighter
if the temperature increases.
CURRENT
- This green LED lights proportionately with the output current delivered to the speaker load.
SIGNAL
- This green LED lights when the output voltage reaches -18dB from full output.
CLIP/MUTE
-
CLIPPING
: The red LED indicates clipping when speaker output is 1dB below rated output, or when
the input preamp signal is clipped.
MUTE
: The LED indicates mute when the channel is muted or when it's level control is fully
attenuated. Additionally, the Clip/Mute LED is used along with the Protect LED to indicate an output DC fault (see
section 14
).
4.6 Amplifier Status LEDs
PROTECT
- The red Protect LED initially turns on to indicate that real-time countermeasures are being applied to overpower,
overtemperature, or rail voltage fault conditions while the amp is still running. If those countermeasures are unsuccessful, the Protect
LED indicates an amplifier shut-down, and the power must be cycled before resuming normal operation. See
section 14
for details.
SLEEP
- This blue LED indicates that the amplifier is asleep. Sleep mode can be enabled as a power saving feature that
shuts down most amplifier circuits after a period of audio inactivity, reducing the amplifier's power consumption to less than 1 Watt.
An amplifier is awakened when there is audio signal present again, or when the power switch is pressed. Because the real-time-clock
is also shut down during sleep mode, the amplifier cannot be awakened by any software function, including the event scheduler.
Sleep mode is normally disabled, therefore must be enabled by the user. On nX series, the sleep clock timer is fixed
at 30 minutes, and is enabled by toggling through the four mode conditions of the factory reset switch as detailed in
section
4.3
. On networked nXe and nXp series, the sleep clock timer also defaults to 30 minutes, but is programmable under [Device
Options] with a range of 1-120 minutes. In all models, the presence of input signal above -24dBu (0.05Vrms) or pressing the
power switch will return the amplifier to normal operation. On all models, a fixed amplifier turn-on delay of three seconds is
necessary to manage in-rush current during power-up or waking from sleep. Sleep mode has priority over standby mode.
DISABLE
- This yellow LED lights when the front panel power switch and level controls have been disabled. All front
panel controls are disabled together using the factory reset switch as described in
section 4.3
, or in software using the amplifier's
main control surface
(see section 9.4a)
.
COM
- For nXe and nXp models only, this green LED lights whenever network communication occurs. Secondly, the COM
LED flashes for two seconds when the <Identify Device> software button for that device is clicked.
(see section 9.1i)
Lastly, the COM
LED becomes lit (along with the flashing power switch LED) during flash reprogram mode.
4.7 Power Switch/LED
– This switch is used for powering the amplifier on or off or waking the amplifier from sleep.
The white switch LED lights solid when the amplifier is on, and flashes when in standby mode (nXe and nXp only). The power
switch can be disabled using the factory reset switch actions described in
section 4.3
, or disabled from software (nXe and nXp only).
The three possible power switch LED conditions are:
1) Fully lit: The amplifier is powered up, even if the power switch has been disabled, in which case the disable LED will be on.
2) Flashing: The amplifier is in standby mode, or is in flash reprogram mode when the COM LED is also lit.
3) Fully off: The amplifier is either completely off, or it is in sleep mode, in which case the blue sleep LED will be on.
4.8 Series and Model Labels
– The label on the left indicates the amplifier series, nX, nXe, or nXp. The label on
the right shows the amplifier model name.
