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QSC DCA Series - page 1
1 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. B ...
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QSC DCA Series - page 2
2 ©Copyright 1998, 2002 QSC Audio Products, Inc. All rights reserved. “QSC , ” “DCA , ” “DataPort , ” and the QSC logo are registered trademarks of QSC Audio Products, Inc. EXPLANATION OF GRAPHICAL SYMBOLS The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsul ...
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QSC DCA Series - page 3
3 TABLE OF CONTENTS INTRODUCTION Introduction and d escription of e ach m odel.................................4 CONFIGURING THE ACCESSORIES General c onfiguration i nformation, all m odels...............................5 XC-3 Setting u p the XC-3....................................................................6 Factory -i nstalled SIPs......... ...
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QSC DCA Series - page 4
4 INTRODUCTION & DESCRIPTION OF EACH MODEL XC-3 This accessory is a two-way crossover, with the low frequency band fed to channel 1 of the amplifier and the high frequencies t o channel 2. An all-pass filter on the low frequency band delays the audio signal, permitting time alignment of a cone driver with a high-frequency horn. A selectable hig ...
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QSC DCA Series - page 5
5 CONFIGURING THE ACCESSORIES Configurable functions of the three accessory models Configure each accessory before you mount it to the ampli- fier. If an accessory is already mounted to an amplifier, always turn the amplifier off before changing switch set- tings, changing input or output connections, or detaching the accessory. Use the tables on t ...
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QSC DCA Series - page 6
6 XC-3 Setting u p 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 ...
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QSC DCA Series - page 7
7 Use these tables to determine the correct resistor values for the crossover frequencies and delays you need. The shaded values are for the high-pass frequency (f HP ) of the XC-3. XC-3 Setting u p the XC-3 Effects of high frequency boost on frequency response (crossover frequency = 500 Hz). A boost of +10 dB is most common for compensating for sc ...
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QSC DCA Series - page 8
8 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 th ...
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QSC DCA Series - page 9
9 LF-3 Setting Up the LF-3 LF-3 Factory-installed SIPs LF-3 Factory Switch Settings LF-3 Recommended Amplifier Settings f xo 350 Hz, both channels (18 k Ω SIP resistor installed in J6 and J8) Delay 1.4 milliseconds, both channels (22 k Ω SIP resistor installed in J1 and J2) Switch 1 and Switch 10 ON: Delay active (both channels) Switch 2 and Sw ...
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QSC DCA Series - page 10
10 Setting up the SF-3 SF-3 Setting u p 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 ...
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QSC DCA Series - page 11
11 SF-3 Factory-installed SIPs fHP= 30 Hz (27 k Ω SIP resistor in J2) fLP= 250 Hz (22 k Ω SIP resistor in J6) SF-3 Factory Switch Settings 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 When shipped from the factory, the DIP switch settings ...
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QSC DCA Series - page 12
12 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. MOUNTING- All Models Mounting the Accessories 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. Line up the HD-15 co ...
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QSC DCA Series - page 13
13 Setting up the DCA Accessories in the Cinema Sound System If you are unable to obtain a satisfactory frequency response or SPL on a channel, carefully check the wiring and connections. Some likely causes are reversed speaker polarity on one or more drivers, loose or broken wiring or connections, or blown or damaged speaker drivers. 1. Set up the ...
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QSC DCA Series - page 14
14 Cleaning The faceplate and chassis can be cleaned with a soft cloth and nonabrasive, noncorrosive, mild cleaning solution. Products like Simple Green and Windex work well. Do not use powders or scrubbing pads of any type as they are usually abrasive and will permanently damage the finish of your cinema accessory. Dampen a soft, lint-free cloth w ...
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QSC DCA Series - page 15
15 WORLD WIDE WEB: http://www.qscaudio.com FACSIMILE (FAX) NUMBERS: Sales & Marketing FAX +1 (714) 754-6174 Technical Services FAX +1 (714) 754-6173 TELEPHONE NUMBERS: Main Number +1 (714) 754-6175 Sales Direct Line +1 (714) 957-7100 or (800) 854-4079 toll free (U.S.A. only) Technical Services (714) 957-7150 or (800) 772-2834 toll free (U.S.A. ...
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QSC DCA Series - page 16
16 © Copyright 1998, 2002 QSC Audio Products, Inc. All rights reserved. “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office. QSC Audio Products, Inc., 1675 MacArthur Boulevard Costa Mesa, California 92626 USA PH: (714) 754-6175 FAX: (714) 754-6174 ...
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