SC281675 MacArthur Blvd., Costa Mesa, CA, 92626 USA Main Number (714) 754-6175 or toll free (USA only) (800) 854-4079 Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834 Loudspeaker Signal Processing Products User Manual SC28 Two-Input, Eight-Output System Controller for QSC Loudspeakers *TD-000238-00* TD-000238-00 rev.
IMPORTANT SAFETY PRECAUTIONS & EXPLANATION OF SYMBOLS The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous” voltage within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in this manual.
Introduction Congratulations and thank you for your purchase of this professional, loudspeaker signal processing product. To get the most from your investment, we recommend you review all the information provided in this User Manual. The SC28 is a two-input, eight-output signal processor intended for use with QSC loudspeakers and QSC power amplifiers.
Unpacking There are no special unpacking precautions. However, it is recommended you keep the original packing material for reuse in the rare event that service be required. If service is required and the original packing material is not available, ensure that the unit is adequately protected for shipment (strong box of appropriate size, sufficient packing material to prevent load-shifting or impact damage) or call QSC’s Technical Services Department for packing material and a carton.
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.
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.
LED Indicators LED metering of both input and output are provided. Input metering is indicated as relative to 0 dBfs (digital clipping of the input signal) and output metering is indicated in actual output voltage levels in dBu. Meters are peak-reading and updated every 50 milliseconds. The lower input metering LEDs will remain illuminated as successively higher levels are indicated. When 0 dbfs is reached, ONLY the upper red LED will illuminate (lower LEDs will extinguish).
‡ Array Delay 0. 00 - 20 . 00 ms 3way Bridge Mono CX 702 Out 2 / 3 Amp CX 502 WL/GP-218 sw WL/GP-212 sw WL-115 sw Bypass / Thru Subwoofer None 450 750 ISA ISA PLX 1804 PLX 2502 PLX 3102 PLX 3602 RMX 1450 RMX 1850 HD PL 3 : 32 dB gain PLX 1104 PLX 1802 PLX 1804 PLX 2502 PLX 3102 PLX 3602 RMX 1450 RMX 1850 HD RMX 2450 RMX 5050 PL 6.0II RMX 4050 HD PL 236 PL 3: 32 dB gain Amp Gain - 25 - 0 dB PLX 1802 PL 230 ‡ This is a linked control.
LCD Navigation Map- Equalization
LCD Navigation Map- Gain
LCD Navigation Map- Utility
Signal Flow
Dimensions 13
Preliminary Specification Dynamic Range (AES-17, -60 dB Method, all sensitivities) unweighted >104 dB A weighted >107 dB Distortion (AES-17, 20 Hz-20 kHz, all sensitivities) +4 dBu 2 dB below clip (max) <0.006% THD+N <0.006% THD+N Crosstalk (20 Hz - 20k Hz) inter-channel (max) >75 dB Input Impedance Balanced (nominal) Unbalanced (nominal) 11k ohms 69k ohms Common-Mode Rejection 20 Hz - 20k Hz (min) 20 Hz - 20k Hz (typ) >75 dB >80 dB Input Sensitivities 1.
Preliminary Specification USB Port USB type “B” USB Cable 1.5 meters long, USB 1.1 compliant AC Power Requirements 100-240 VAC, 50-60 Hz, no user adjustment required AC Power Connection IEC-type inlet AC Power Cord 2 meters long, #18AWG Specifications are subject to change without notice.
Warranty (USA only; other countries, see your dealer or distributor) Disclaimer QSC Audio Products, LLC is not liable for any damage to amplifiers or any other equipment that is caused by negligence or improper installation and/or use of this loudspeaker product.