QSC KW153 [18/28] Additional features

Additional Features

Standby

All KW Series models are equipped with an automatic standby feature to conserve energy when the systems are not in use. If no signal is present on

any input, or the gain knob is turned to off for ﬁve minutes, the power ampliﬁer goes into standby and the green STBY LED illuminates. In this mode,

the ampliﬁer is powered down. A small amount of current will continue to ﬂow from the AC power source into the power supply of the KW Series.

This current keeps the power supply and DSP “awake” to reduce turn on time when the system is brought out of standby. The power-up time of the

ampliﬁer is negligible and is shorter than the latency of the DSP, so no signal is cut off when the KW Series system is brought out of standby. A KW

Series loudspeaker can also be manually brought out of standby by turning the POWER switch off and then back ON.

Front LED Functions

The front LED may be set to any of three modes by the FRONT LED switch on the rear panel.

• From the factory, the FRONT LED switch is set to the PWR position. The front LED illuminates

brightly when the POWER switch is in the ON position.

• When the FRONT LED switch is in the OFF position, the front LED is not illuminated. This

setting is recommended in applications where the front LED may be visually objectionable.

• When the FRONT LED switch is in the LIMIT position, the front LED tracks the LIMIT LED on

the rear panel. When the KW Series is in limiting (meaning that one or more of the limiters

is engaging to protect some part of the system) the front LED glows brightly in response to

the limiting function. This allows the system operator to have awareness of the status of the

limiters without needing to see the rear of the unit. For more information see the section

below on the rear LIMIT LED. When not in limiting and when the unit is not in standby, the

front LED is dimly illuminated.

Rear LIMIT LED

The red LIMIT LED can indicate that limiting has taken place to protect and avoid damage to

the ampliﬁer or loudspeaker. If the signal level at any frequency is too high, the DSP limits the

signal to prevent damage and the red LIMIT LED illuminates. If the ampliﬁer is too hot due

to prolonged use at extreme SPL levels or the environment is too hot, the red LIMIT LED is

illuminated. If the red LIMIT LED is on when both GAIN controls are at minimum for 10 minutes,

your KW Series loudspeaker requires service by qualiﬁed personnel or should be moved to a

cooler environment.

Front LED Switch

LIMIT LED