Related Manuals for QSC UF-3
Summary of Contents for QSC UF-3
- Page 1 UF-3 UF-3 UF-3 UF-3 UF-3 Universal Universal Universal Universal Universal Filter Filter Filter Filter Filter *TD-004031-00* *TD-004031-00* Rev. A...
- Page 3 Physically, the UF-3 is a small circuit card that mounts inside the amplifier. Older amplifier models that use Open Input Architecture have a two- section row of 22 solder holes called a “Mini Slot” on their input boards. This is where the UF-3 is installed. The input board is part of the removeable input module, so the UF-3 can be installed without opening the amplifier chassis or even without removing the amplifier from an equipment rack.
- Page 4 III. PROGRAMMING THE UF-3 The UF-3 circuit board has six 3-pin headers and four SIP resistor network sockets (see Figure 2). All are used for programming the module. The circuitry for the two channels is identical, so the headers and sockets are divided between them: those designated by a three-digit number starting in a “1”...
- Page 5 In addition to enabling the high-pass filter at Jx02, if you opt for CD horn equalization you must place a jumper at Jx03 as well. The UF-3 offers two equalization curves for CD horn correction: one with +6 dB of boost at 20 kHz (place the jumper across pins 1 and 2 of Jx03), and one with +10 dB of boost at 20 kHz (place the jumper across pins 2 and 3).
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Page 6: Typical Applications
Insert a resistor network in RNx04 that is appropriate to the desired roll-off frequency—typically 20, 30, 40, or 50 Hz. Use only these three digits to determine resistance code. Disregard the other numerals and letters. Figure 4—SIP resistor network identification Subsonic roll-off Figure 5—UF-3 as a subsonic filter RESISTANCE CODE 1.2K 1.5K 1.8K 2.0K 2.2K 2.7K... - Page 7 CD Horn Equalization Filter A constant-directivity horn requires a 6 dB per octave high-frequency boost from about 3.5 kHz to provide a flat frequency response. On the UF-3 you must use the CD horn equalization in conjunction with the high-pass filter.
- Page 8 This configuration routes the frequencies below a particular frequency to amplifier Channel 1, which shall drive the low-frequency speakers, and the frequencies above to Channel 2, which shall drive the high-frequency speakers. Using the UF-3 as a crossover requires that you drive both amplifier inputs with the same full-band signal.
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Page 9: Installation
Multi-way Crossover System The UF-3 allows you to set up 3- and even 4-way systems. Of course, this also requires that you use more than one amplifier and more than one UF-3. The other basic requirement of using the UF-3 as a crossover is that you must feed each amplifier with the same full-range signal and use the UF-3 to filter the signals in the individual channels. - Page 10 Make sure you insert the UF-3 card on the correct side of the BusCard. Insert the UF-3 fully into the holes on the BusCard. Solder all 22 pins to the BusCard; make sure you don’t create any solder bridges. Then install the BusCard in the amplifier; see the BusCard instructions for details.
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Page 11: Warranty And Disclaimers
Reconnect the ribbon cable to the input board connector. Press the locking clamp wings of the connector closed. You will feel them snap onto place. If you need to make any adjustments to the UF-3 settings or if you need to record them, do so now, because the UF-3 will be inaccessible once the input panel is re-installed into the amplifier chassis. -
Page 12: Technical Assistance & Service
Technical Assistance If you suspect that your UF-3 is defective, check your system configuration and UF-3 settings to determine the origin of the problem. Incorrect audio interfacing, poor cabling, or other system-level impairments are the leading causes of problems in audio systems. For technical assistance beyond the information given in this manual, contact QSC Technical Services. - Page 14 QSC Audio Products, Inc. 1675 MacArthur Blvd., Costa Mesa, California 92626 USA Tel: +1 714 754-6175 Fax: +1 714 754-6174 Web: www.qscaudio.com...
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