User manual QSC AUDIO SC28

[. . . ] 2- Never restrict airflow through the device vents. Please insure that the air intake and exhaust vents are unobstructed. 3- When installing equipment into rack, distribute the units evenly. Otherwise, hazardous conditions could be created by an uneven weight distribution. [. . . ] Plug the AC line connector into the AC outlet. The power supply will accept 100-240 Volts AC, 50-60 Hertz. If a different type of IEC power cord is required than supplied with your SC28, contact QSC's Technical Services Department. The correct AC line voltage is shown under the AC power inlet, on the rear panel. Connecting to the wrong line voltage may damage the amplifier or increase the risk of electric shock. USB Port On the rear panel, there is a type "B" USB port. This port is for firmware updates and diagnostic functions. Refer to the Updating Firmware section of this manual for further information. 4 Audio Inputs On the rear panel, there are two female XLR line-level inputs marked INPUTS below the connectors and designated A and B above the connectors. Connect the line-level analog audio inputs to these connectors. Input sensitivity can be selected from the Setup Menu; selections are 1. 5 Vrms/6 dBu, 3 Vrms/12 dBu, 9 Vrms/21 dBu, or 18 Vrms/ 27 dBu. These values correspond to the maximum input signal level that can be applied to the inputs without clipping. The signal's source impedance should be less than 600 ohms. We recommend balanced connections be used. Balanced connections will reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suitable for short cables. The input impedance is 11k ohm for balanced connections or 69k ohm for unbalanced connections. Input connectors Audio Outputs There are two sets of line-level outputs on the rear panel grouped as A OUTPUTS and B OUTPUTS. Each group has four male XLR connectors numbered 1, 2, 3, and 4. They are "mapped" with the following general convention: Output connectors OUTPUT 1- Subwoofer Output OUTPUT 2- Low Frequency 1 Output OUTPUT 3- Low Frequency 2 Output OUTPUT 4- High Frequency Output There are two Low Frequency outputs (OUTPUT 2 and OUTPUT 3) to allow for low frequency shading requirements of line arrays when operated in triamp mode. If the shading network of the loudspeaker is used, OUTPUT 2 is not utilized and the amplifiers are operated in biamp mode. Pinout label on rear panel XLR Connector Pinout Shown are the pinouts for the XLR connectors. Male connectors shown, pinout is the same for female connectors. We recommend balanced connections be used. Balanced connections will reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suitable for short cables. The input impedance is 11k ohm for balanced connections or 69k ohm for unbalanced connections. Balanced connection pinout 1= shield (ground) 3= minus (-) 2= plus (+) Unbalanced connection pinout 1= shield (ground) 3= jumper to pin 1 2= plus (+) 5 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. [. . . ] This limited warranty is freely transferable during the term of the warranty period. Customer may have additional rights, which vary from state to state. In the event that this product was manufactured for export and sale outside of the United States or its territories, then this limited warranty shall not apply. Removal of the serial number on this product, or purchase of this product from an unauthorized dealer, will void this limited warranty. [. . . ]