QSC Audio K12, K8, K10, KSub AC Mains Disconnection, Power Switch, Rear LED Power Indicator

AC Mains

Connect AC power to the IEC socket on the back of the amplifier by locating the IEC connector-end of the AC power cord and inserting it fully into the IEC inlet on the power amplifier module. NOTE: Turn off the AC power switch before connecting AC power.

The V-LOCK power cord has a special latching feature to prevent the power cord from being unintentionally removed. The IEC plug and socket are both blue in color so the power cord can be identified as a K Series loudspeaker cord. If the QSC supplied cord becomes lost or damaged, a standard replacement 18 gauge IEC power cord may be used. However, the latching system will only function with a V-LOCK power cord available from QSC Audio Products, LLC.

The K Series is fed by a universal power supply. This power supply is capable of operating the system with input AC power voltages ranging from 85 VAC to 265 VAC at 50 – 60 Hz. There are multiple power cables supplied for this reason.

Use only the power cable that is correct for your location.

You may discard any other power cables, find an appropriate recycling opportunity or keep them if travel to other regions with the K Series product is likely.

AC Mains Disconnection

Turn the AC power switch to the off position. To remove the AC mains cord, grasp the IEC connector’s plastic body, press the yellow latch release but- ton and pull, removing the connector from the socket.

Power Switch

Push in on the top of the rocker switch to apply AC mains power to the powered loudspeaker. Push in on the bottom of the rocker switch to turn the powered loudspeaker off.

When turned on, the green STANDBY indicator LED and the red LIMIT (limiter) indicator LED on the rear panel will illuminate; after a few seconds the red LIMIT indicator and the green STANDBY will extinguish, and the blue POWER indicator LED will illuminate.

Rear LED POWER Indicator

The blue LED POWER indicator on the rear panel will illuminate when the AC Power switch is in the “ON” position, the unit is not in standby, the AC mains power cord is connected properly, and the AC mains are functioning properly. The rear LED POWER indicator will extinguish when the AC Power switch is in the “off” position, AC mains power has been removed from the loudspeaker, or the amplifier enters standby.

If the rear LED POWER indicator does not illuminate when the Power switch is placed in the “on” position during the first 5 minutes of power being applied, verify the AC mains line cord is properly attached to the loudspeaker and plugged into the AC outlet. Verify the outlet is functioning properly.

If the AC mains cordset is serviceable and the AC mains outlet is operating properly, but the loudspeaker fails to operate, the loudspeaker may require servicing. Contact QSC’s Technical Services department.

System Power Sequencing

Proper power turn on/turn off sequencing can help to prevent unexpected sounds from being produced by the system (pops, clicks, thumps). These unintended sounds can be unpleasant and take away from the overall professionalism of the presentation. Always

follow the rule that speakers are “last on, first off”.

Power On Sequence: Bring the output level control of the mixer (or other audio source) feeding your speakers to its minimum position. Turn on all source devices (CD players, mixers, instruments), turn on subwoofer, then turn on the “top-boxes” (K8, K10, K12). The level controls on your mixer may now be brought up.

Power Off Sequence: Turn off “top boxes,” turn off subwoofer, then turn off all source devices.

If a K Series speaker is being driven from the output of another K Series unit, it should be turned on after the unit feeding it signal, and turned off before the unit feeding signal.

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