QSC Audio SC28 General Information, AC Mains, Amplifier Setup, Updating Firmware, Channel Link

Use

General Information

Use of the SC28 involves adherence to the following to achieve proper operation:

1- Input sensitivity for the SC28 must be set to correspond with expected audio source levels.

2- Crossover type must be selected to correspond with amplifier and loudspeaker setup (Biamp or Triamp)

3- Subwoofer operation must be enabled or disabled. If enabled, subs can be configured as stereo or summed (mono) and sub gain can be adjusted for more or fewer subwoofers than a typical system.

4- Delay times can be inserted for the subs and/or arrays.

5- Limiting can be selected for loudspeaker protection or clip limiting. Loudspeaker protection setting is recommended.

6- Each output of the SC28 must have the amplifier type/model selected and have the amplifier operating mode selected (stereo/ bridge mono).

7- The “Amp Gain” value must be set to match the actual gain control settings of the amplifiers connected to the outputs. All amplifi- ers must be set to the same gain values.

8- Adherence to connector pinouts and wiring recommendations must be followed.

9- The SC28 “EQ Menu” selections can then be adjusted to compensate for array size, shape, and environmental factors.

Refer to the SC28 Menu Navigation, System Wiring Reference, and the loudspeaker’s User Manuals for detailed information.

AC Mains

There is no AC power switch on the SC28. To connect AC Mains power to the SC28, insert the IEC molded line cord plug into the IEC receptacle on the rear panel and plug the AC line cord plug into a properly operating AC outlet. To disconnect the SC28 from the AC Mains, unplug the AC line cord plug from the AC Mains outlet.

Amplifier Setup

The QSC amplifiers connected to the SC28 must have their power switches in the “on” position. For initial testing, use the lowest use- ful gain setting until the system is operating as expected. After the system setup has been verified and tested, gain settings may be adjusted as required.

All amplifiers should have their Gain controls set to identical values. This applies to all amp channels, not just channels on one amp.

IMPORTANT! Amp gain control values must be entered in the amplifier setup menu for proper operation.

Updating Firmware

If a firmware update is required, please visit the QSC website and navigate to the SC28 Firmware Updater page. Download and install the SC28 Firmware Updater software and follow the instructions provided with the software. The USB port is used for the update and a cable is supplied with the SC28.

Security Features

The 4-digit passcode is set and enabled via passcode screens in the SC28’s Utility menu. When the passcode is enabled, no menu access is allowed without the passcode. After 10 minutes of inactivity, the display will automatically revert to the Startup menu and will prompt the user for the passcode (if enabled). Resetting the passcode: Push in on the rotary encoder knob while the power is turned on (IEC linecord inserted into IEC inlet).

Channel Link

Channel Linking may be enabled/disabled via the channel link screen in the Utility menu. When Channel Link is enabled (Linked) some A/B controls become linked and are controlled via a single front-panel screen. When channel Link is disabled (Independent) these con- trols are adjusted independently via separate front-panel screens. When changing the Channel Link form Independent to Linked, chan- nel A’s parameters overwrite the channel B’s.

Left/Right Controls that may be linked: •Sub and Array delays

•Parameters of all user-adjustable filters •Input mute and sensitivity

•Output mutes •Sub gain

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