User manual QSC AUDIO LF-3

[. . . ] Cinema Accessories for DCA Series amplifiers USER MANUAL XC-3 LF-3 SF-3 Two-way crossover with delay Low-frequency filter with delay Subwoofer filter *TD-000079-00* TD-000079-00 rev. B 1 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. The exclamation point within an equilateral triangle is intended to alert the users to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To reduce the risk of electric shock, do not remove the cover. Refer servicing to qualified service personnel. [. . . ] 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. Use the table, opposite page, to select the correct resistor networks for the SF-3's filter frequency settings. The SIPs supplied provide a selection of three low-pass frequencies: 80, 150, and 250 Hz; and six high-pass frequencies from 20 to 50 Hz. [. . . ] ("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 pre-paid transportation with a copy 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 There is no user-level maintenance on the LF-3, SF-3, or XF-3. Contact QSC's Technical Services Group if service is required. [. . . ]