SC28 User Manual - Shure Distribution
Contents
1. C281675 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 C28 Two Input Eight Output System Controller for OSC Loudspeakers TD 000238 00 rev B IMPORTANT SAFETY PRECAUTIONS amp 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 SAFEGAURDS Electrical energy can perform many useful functions This unit has been engineered and manufactured to assure your personal safety Improper use can result in potential electrical shock or fire hazards In order not to defeat the safeguards observe the following instructions for its installation use and servicing CAUTION To reduce the risk of electric shock do not remove the cover No user serviceable parts inside Refer servicing to qualified service personnel WARNING To prevent fire or electric shock do not expose this equipment to rain or moisture 1 Maximum operating ambient temperatu2. XIIN OUD E Wen N P 9 SJ8p jean 19 31N innisu s nIN oo w V mamam OT OTE Ee SS Buniun e C gt Aejaq Jajoomqns uonezijenby Aoutdug MO eub 12 Dimensions SC28 System Controller 18 94 481mm 6 67 169mm 1 73 44mm 13 Preliminary Specification Dynamic Range AES 17 60 dB Method all sensitivities unweighted A weighted Distortion AES 17 20 Hz 20 kHz all sensitivities 4 dBu 2 dB below clip max Crosstalk 20 Hz 20k Hz inter channel max Input Impedance Balanced nominal Unbalanced nominal Common Mode Rejection 20 Hz 20k Hz min 20 Hz 20k Hz typ Input Sensitivities Audio Converters Digital Processing Mute Throughput Delay Program Inputs Connector Type Type Grounding Pinout Program Outputs Connector Type Type Grounding Pinout Controls Indicators Power LCD Data Display Input Output Meters gt 104 dB gt 107 dB lt 0 006 THD N lt 0 006 THD N gt 75 dB 11k ohms 69k ohms gt 75 dB gt 80 dB 1 5 Vims 6 dBu 3 Vims 12 dBu 9 V 21 dBu or 18 V ms 27 dBu 24 bit 48 kHz in and out 32 40 bit floating point infinite attenuation 1 4125 milliseconds 2
3. Quantity 1 SC28 System Controller 1 2 Hardware Manual this document 1 3 IEC Power Cord 3 x 18 AWG 2 meters 1 4 USB cable 1 5 System Wiring Reference Card s varies Mounting The SC28 can be used in or out of an equipment rack Rack mounting is optional Rack Mounting Rack mount the SC28 by supporting it from underneath while aligning the mounting holes with the threaded screw holes in the rails install all four mounting screws and washers and tighten securely Ensure use of all four mounting screws in order to minimize the chance of bending or distorting the rack mount ears When installing equipment into rack distribute the units evenly Otherwise haz ardous conditions could be created by an uneven weight distribution Maximum operating ambient temperature is 40 C 104 F Never restrict airflow through the device vents 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 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 0SCs 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 sho
4. Patent and Trademark Office All trademarks are the property of their respective owners
5. XLR female locking Electrically balanced All shield terminals connected to chassis 1 GND 2 3 8 XLR male Electrically balanced All shield terminals connected to chassis 1 GND 2 3 Rotary encoder knob with push to select function Blue front panel 2 line x 16 character backlit front panel Green Yellow Red front panel Specifications are subject to change without notice Preliminary Specification USB Port USB Cable AC Power Requirements AC Power Connection AC Power Cord USB type H 1 5 meters long USB 1 1 compliant 100 240 VAC 50 60 Hz no user adjustment required EC type inlet 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 Inc 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 OSC Audio Products 3 Year Limited Warranty OSC Audio Products Inc 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 transpor tation with a c
6. alization and precise crossover control Active loudspeaker protection extends the life of drivers The SC28 solves many appli cation challenges by greatly simplifying the configuration of multi way loudspeaker systems SC28 and OSC loudspeakers are the per fect solution for public performances corporate events and private parties demanding flexible and excellent sounding system solutions SC28 Features Aa B 3 SC28 e 2dBfs u S 4 OoOo S O 5dBfs u System Controller O o O 15dBfs 10dBu O O Oo 30aBts INPUTS L B OUTPUTS Ee N _ e LC Wa N j j Coa 9 N Fe A gt A OUTPUTS B OUTPUTS SS INPUTS 10 1 Input meters 6 Qutput connectors 2 LCD display 7 Input connectors 3 Qutput meters 8 USB port 4 Rotary encoder knob press to select 9 IEC inlet 5 Power LED 10 Firmware update mode select recessed 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 ade quately protected for shipment strong box of appropriate size sufficient packing material to prevent load shifting or impact damage or call OSC s Technical Services Department for packing material and a carton What Is included in the carton Item Description
7. ameters such as Gain or Filter Fre quency turning the knob more quickly i e spinning will accelerate the parameters change LCD Icon key Loudspeaker protection clip limiting is active a Turning the knob to the right will increment the current selection Turning the knob to the left will decrement the current selection Pressing knob will enter sub menu or allow the current selection to be edited A o B e 2ubfs O 5dBfs o 15dBfs o 3o0dBts INPUTS Input metering for the SC28 Note digi tal clipping will be indicated by ONLY the top red LED being illuminated 1 2 3 4 1 2 3 4 Opapu o nO 00n80 soa L A OUTPUTS L B OUTPUTS Output metering for the SC28 Meters indicate actual voltage level in dBu for each output 4 dBu is maximum input level for most OSC amplifiers Oe errr G 10dBu O O Oo O 5aBts Speaker Config J CO y Choma C O O O O O 15dBts O O O towO O O Oo Q 30dBfs ILA 2 way O O 3208O O INPUTS A OUTPUTS L B OUTPUTS LCD display of the SC28 Typical loud speaker configuration parameters shown PUSH TO SELECT Control knob rotary encoder Adjust able parameters can be changed by rota
8. ck 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 B 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 Vino 6 dBu 3 Vime 12 dBu 9 Vims 21 dBu or 18 Vimy 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 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 1 Subwoofer Output OUTPUT 2 Low Frequency 1 Output le s i A OUTPUTS 3 There are two Low Frequency outputs OUTPUT 2 and OUTPUT 3 to allow for low fre quency shading requi
9. 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 As parameters overwrite the channel B s Left Right Controls that may be linked e Sub and Array delays e Parameters of all user adjustable filters e nput mute and sensitivity e Output mutes e Sub
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11. g 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 A IMPORTANT Amp gain
12. gain 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 indi cated 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 If 0 dBfs is indicated often reduce input signal level to the SC28 This will reduce possibly audible distortion caused by clipping the digital input of the SC28 The output meters indicate the actual output voltage level in dBu OdBu 0 775Vrms Most OSC amplifiers clip limit at about 4 dBu input level LCD Display and Control Rotary Encoder The SC28 has a 2 line X 16 character LCD display The display and the push to select rotary encoder knob pro vide data access and editing capability The rotary select accept knob Is active for most displayed items allowing you to scroll through choices by rotating the control and accepting choices entering by pushing in on the control The accessible menus and sub menus may appear dif ferently than example shown Software updates may occasionally improve the interface On the following pages are shown the basic navigation flow for the SC28 menu system Setup EQ Gain and Utility Notes When editing par
13. n between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio or TV technician for help Copyright 2007 QSC Audio Products Inc 0SC is a registered trademark of QSC Audio Products Inc OSC and the QSC logo are registered with the U S Patent and Trademark Office All trademarks are the property of their respective owners 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 OSC loudspeakers and QSC power amplifiers The SC28 provides QSC system specific signal processing for getting the highest performance and superior sound quality from QSC loudspeakers integrated with QSC amplifiers Two channels of audio enter the SC28 via locking female XLR connectors Digital audio conversion is 48 kHz 24 bit input and output with a very low noise floor and wide dynamic range DSP is 32 40 bit floating point Four channels of output for each of the two inputs are provided for controlling up to 3 way systems with subwoofers The SC28 provides excellent sound quality durable construction and simple deployment Amplifiers are matched to the drivers with active equ
14. opy 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 OSC shall not be liable for incidental and or conse quential damages This warranty gives you specific legal rights This limited warranty is freely transfer able 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 Periodically this warranty is updated To obtain the most recent version of QSC s warranty statement please visit www qscaudio com Contact us at 800 854 4079 or visit our website at www qscaudio com 1675 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 OSCE Copyright 2007 QSC Audio Products Inc 0SC is a registered trademark of QSC Audio Products Inc OSC and the QSC logo are registered with the U S
15. re is 40 C 104 F 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 4 Connect the unit only to a properly rated supply circuit The C28 is suitable for connection to 100 240 VAC 50 60 hertz with no special considerations other than the appropriate IEC power cord 5 Reliable Earthing Grounding of rack mounted equipment should be maintained FCC INTERFERENCE STATEMENT NOTE This equipment has been tested and found to comply with the limits for a class B digital device pursuant to part 15 of the FCC rules 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 recep tion 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 Increase the separatio
16. rements 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 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 Input connectors L mwpure Output connectors 3 A AAA B OUTPUTS Pinout label on rear panel XLR PINOUTS 1 shield ground 3 jumper to pin 1 2 plus 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 settin
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