User manual QSC AUDIO SF-3

[. . . ] While QSC has endeavored to develope and produce the most dependable and robust Cinema Accessory for your use, QSC cannot be held responsible for damages resulting from any deviation or failure by the user to strictly follow the recommendations set forth in the user manual. All risks attendant to integration of user-configurable Cinema Accessories with your sound system are assumed by you. While QSC strives to supply the highest quality technical solutions, in no event will QSC or its suppliers be held liable for any damages, consequential, incidental, or otherwise, including any claims for lost profits and/or savings resulting from any attempted integration of the cinema accessories which does not strictly adhere to the manual's recommendations. ©Copyright 1998, 2002 QSC Audio Products, Inc. "QSC, " "DCA, " "DataPort, " and the QSC logo are registered trademarks of QSC Audio Products, Inc. 2 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Illustrations: Setup flow chart, XC-3 front and rear, delay and crossover SIP selection charts, SIP identifier chart, and HF boost response curve. LF-3 Setting up the LF-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Factory-installed SIPs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Factory switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Recommended amplifier settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Illustrations: Setup flow chart, LF-3 front and rear, delay and crossover SIP selection charts, SIP identifier chart. SF-3 Setting up the SF-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Factory-installed SIPs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Factory switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Recommended amplifier settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Illustrations: Setup flow chart, SF-3 front and rear, low-pass/high-pass SIP selection chart, SIP identifier chart. MOUNTING TO AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 APPLICATION EXAMPLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 WARRANTY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 HOW TO CONTACT QSC AUDIO PRODUCTS . . . . . . . . . . . . . . . . . . . . 15 3 INTRODUCTION & DESCRIPTION OF EACH MODEL Introduction This manual covers setup and operation of cinema crossover accessories for QSC DCA Digital Cinema Amplifiers. [. . . ] 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. The SIP resistor networks can be inserted either way, as long as each network pin goes into its own hole in the socket. Straighten the pins, if needed, before inserting the SIP into its receptacle. Use the tables on the following page to select the correct resistor networks for the settings you need. The SIPs supplied with the XC-3 provide a selectable frequency range for f XO of 80 Hz to 1. 5 kHz, and delay settings from 0. 3 to 1. 8 milliseconds; contact QSC's Technical Services Group if your application requires different settings. When using the XC-3 in a three-way system in conjunction with the LF-3, the lower frequency (fHP) should match the crossover frequency of the LF-3 (fXO). The SIPs supplied with the XC-3 allow a selectable frequency range for fHP of 80 to 500 Hz. XC-3 Factory-installed SIPs fXO LF delay fHP 500 Hz (12 k SIP resistor in J1) 1. 8 milliseconds (27 k SIP resistor in J2) 80 Hz (68 k SIP resistor in J7) XC-3 controls, switches, and SIP socket locations 6 XC-3 XC-3 Factory Switch Settings Setting up the XC-3 When shipped from the factory, the DIP switch settings should be set as follows: Switches 7 & 8 ON: Switch 1 ON: Switches 3 through 6 OFF: Switches 2, 9, and 10 ON: sets XC-3 to Biamp mode activates LF delay HF boost disabled Factory default settings for proper operation. XC-3 Recommended Amplifier Settings Clip limiters: ON (both channels) Low frequency filters: ON (both channels), select either 30 or 50 Hz roll-off, depending on speaker specifications (both channels) Operating mode: stereo 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 (fHP) of the XC-3. Delay (ms) 1. 8 1. 4 1. 3 1. 2 1 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 SIP resistor value 27K 22K 20K 18K 15K 12K 10K 8. 2K 6. 8K 5. 6K 4. 7K Crossover freq. (fXO) 80 Hz 150 Hz 200 Hz 250 Hz 300 Hz 350 Hz 400 Hz 500 Hz 600 Hz 650 Hz 800 Hz 1 kHz 1. 2 kHz 1. 5 kHz SIP resistor value 68K 39K 27K 22K 20K 18K 15K 12K 10K 8. 2K 6. 8K 5. 6K 4. 7K 3. 9K Identifying SIP resistor networks Effects of high frequency boost on frequency response (crossover frequency = 500 Hz). A boost of +10 dB is most common for compensating for screen loss (attenuation of high frequencies as sound passes through screen perforations). 7 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). (fXO) 80 Hz 150 Hz 200 Hz 250 Hz 300 Hz 350 Hz 400 Hz 500 Hz SIP resistor value 68K 39K 27K 22K 20K 18K 15K 12K 1. 3 1. 2 1 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 9 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. The resistor networks can be inserted either way, as long as each pin goes into its own receptacle. Straighten pins, if needed, before inserting the SIP into its receptacle. The mono subwoofer program can be derived from summing and filtering stereo or mono full-range audio or it can come from a discrete mono subwoofer channel, such as in a 5. 1, 6. 1, or 7. 1 cinema surround system. If the subwoofer program is to be derived, use the SF-3's low-pass filter to set the high end of the subwoofer passband. If the subwoofer program source is a discrete channel, as in most cinema systems, we recommend you bypass the low-pass filter. [. . . ] To obtain the location of you nearest QSC Authorized Service Center, please contact you QSC dealer or contact QSC's Technical Services Group. is not liable for any damage to speakers, amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of the LF-3, SF-3, or XF-3. Due to the possibility of the user installing a SIP resistor improperly or of an incorrect value, QSC Audio Products, Inc. is not liable for any direct or indirect damage caused by improper SIP installation or value selection. [. . . ]