User manual QSC AUDIO SC28

[. . . ] These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance to the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by switching the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient or relocate the receiving antenna. [. . . ] Ensure use of all four mounting screws in order to minimize the chance of bending or distorting the rack mount ears. Otherwise, hazardous conditions could be created by an uneven weight distribution. Maximum operating ambient temperature is 40°C (104°F). Please insure that the air intake and exhaust vents are unobstructed. Connections AC Power Cord Insert the molded receptacle of the AC power cord into the AC power inlet on the rear panel of the SC28. 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. 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. 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. Balanced connections will reduce AC hum and interference, especially with long cable runs. 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. 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. Balanced connections will reduce AC hum and interference, especially with long cable runs. 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. 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. 5- Limiting can be selected for loudspeaker protection or clip limiting. 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. 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. [. . . ] ("QSC") guarantees its products to be free from defective material and / or workmanship for a period of three (3) years from date of sale, and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use provided the unit is returned to our factory or one of our authorized service stations via prepaid transportation with a copy of proof of purchase (i. e. , sales receipt). This warranty provides that the examination of the return product must indicate, in our judgment, a manufacturing defect. This warranty does not extend to any product which has been subjected to misuse, neglect, accident, improper installation, or where the date code has been removed or defaced. This limited warranty is freely transferable during the term of the warranty period. [. . . ]