Cinema Accessories for DCA Series amplifiers USER MANUAL ▼ XC-3 Two-way crossover with delay ▼ LF-3 Low-frequency filter with delay ▼ SF-3 Subwoofer filter *TD-000079-00* TD-000079-00 rev.
IMPORTANT SAFETY INFORMATION: PLEASE REVIEW! EXPLANATION OF GRAPHICAL 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.
TABLE OF CONTENTS INTRODUCTION Introduction and description of each model.................................4 CONFIGURING THE ACCESSORIES General configuration information, all models...............................5 XC-3 Setting up the XC-3....................................................................6 Factory-installed SIPs..........................................................6 Factory-switch settings.........................................................7 Recommended amplifier settings........
INTRODUCTION & DESCRIPTION OF EACH MODEL Introduction This manual covers setup and operation of cinema crossover accessories for QSC DCA Digital Cinema Amplifiers. There are three models: the XC-3 crossover, the LF-3 low frequency filter, and the SF-3 subwoofer filter. Together with DCA amplifiers, they allow you to assemble any type of cinema sound system, mono or multi-channel.
CONFIGURING THE ACCESSORIES Configuring the Accessories Configurable functions of the three accessory models Configure each accessory before you mount it to the amplifier. If an accessory is already mounted to an amplifier, always turn the amplifier off before changing switch settings, changing input or output connections, or detaching the accessory. Use the tables on the following pages to determine the correct SIP resistor network value for the desired frequency and delay settings.
Setting up the XC-3 XC-3 Setting up the XC-3 Setting up the XC-3 requires setting the DIP switches and selecting/inserting SIP resistors into the appropriate sockets. DIP switches #2, #9, and #10 must be set to the ON position (default settings for the XC-3). The flowchart below takes you through all the steps necessary before mounting the accessory to the amp. The illustration below shows the locations of the sockets for the SIP resistor networks.
Setting up the XC-3 XC-3 XC-3 Factory Switch Settings When shipped from the factory, the DIP switch settings should be set as follows: Switches 7 & 8 ON: sets XC-3 to Biamp mode Switch 1 ON: activates LF delay Switches 3 through 6 OFF: HF boost disabled Switches 2, 9, and 10 ON: Factory default settings for proper operation.
LF-3 Setting Up the LF-3 Setting up the LF-3 Setup flowchart for the LF-3 Setting up the LF-3 requires setting the DIP switches and selecting/inserting SIP resistors into the appropriate sockets. DIP switches #2 and #4 through #9 must be set to OFF, and switch #3 set to ON (factory default for proper operation). The flowchart , right, takes you through the steps necessary before mounting the accessory to the amp. The LF-3 is typically used in a system in conjunction with the XC-3 crossover.
LF-3 Setting Up the LF-3 LF-3 Factory-installed SIPs fxo 350 Hz, both channels (18 kΩ SIP resistor installed in J6 and J8) Delay 1.
SF-3 Setting up the SF-3 Setting up the SF-3 Setting up the SF-3 requires setting the DIP switches, and selecting/inserting SIP resistors into the appropriate sockets. DIP switches #1 through #6 and #10 must be set to OFF (factory default for proper operation). The flowchart, right, takes you through all the steps necessary before mounting the accessory to the amp. The illustration below shows the locations of the two SIP sockets on the SF-3.
SF-3 Setting Up the SF-3 SF-3 Factory-installed SIPs fHP= 30 Hz (27 kΩ SIP resistor in J2) fLP= 250 Hz (22 kΩ SIP resistor in J6) SF-3 Factory Switch Settings When shipped from the factory, the DIP switch settings should be set as follows: Switches 1 through 6 and Switch 10 OFF: Default setting for SF-3 Switches 7 & 8 ON: Low-pass filter off (“cinema” setting) Switch 9 OFF: LF flat SF-3 Recommended Amplifier Settings Clip limiters ON (both channels) High-pass filter OFF (both channels) Operating mode: S
MOUNTING- All Models Mounting the Accessories An accessory may be mounted with the amplifier either in or out of the rack, even if the amp is installed with rear rack ears. 1. Turn off the amplifier before installing the accessory. 2. Make sure the SIP resistor networks are installed properly and no SIP sockets are empty. 3.
APPLICATION EXAMPLE- Setting Up in the Cinema Sound System Setting up the DCA Accessories in the Cinema Sound System Setting up the DCA accessories in the B chain of the cinema sound system primarily involves setting the trim levels on the XC-3, LF-3, and SF-3. This requires the cinema processor’s internal pink noise generator and an acoustical real-time spectrum analyzer. 1. Set up the analyzer microphone in the center of the cinema audience seating area or in another recommended location. 2.
MAINTENANCE AND WARRANTY Cleaning QSC Audio Products 3 Year Limited Warranty The faceplate and chassis can be cleaned with a soft cloth and QSC Audio Products, Inc. (“QSC”) guarantees its products to be free nonabrasive, noncorrosive, mild cleaning solution. Products like from defective material and / or workmanship for a period of three Simple Green and Windex work well.
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