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QSC Audio UF-3 - page 1
11 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 Owner’ s Manual ...
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QSC Audio UF-3 - page 2
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QSC Audio UF-3 - page 3
1 I. DESCRIPTION The UF-3 is an embedded dual-channel universal filter accessory for use with select QSC power amplifiers. Compatible amplifier models and lines, both current and discontinued, include: • All PLX, two-channel CX, and two-channel DCA models (with a BSC-3 or BSC-5 BusCard installed) • All four-channel CX and DCA models (with a BSC ...
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QSC Audio UF-3 - page 4
2 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 ” (headers J101, ...
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QSC Audio UF-3 - page 5
3 Programming the High-Pass Filter and CD Horn Equalization To use either the high-pass filter or the constant-directivity horn equalization, or both, set the jumper on Jx02 across pins 2 and 3, which are the lower two pins on their header. If, however, you do not wish to use either one and want to bypass them instead, set the jumper across pins 1 ...
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QSC Audio UF-3 - page 6
4 IV . TYPICAL APPLICA TIONS Subsonic Filter Subsonic filters are commonly used in sound installations to filter out rumbles and other inaudible or unwanted low frequency signals and to protect speaker drivers. Vented speaker enclosures in particular often exhibit a phenomenon in which the acoustical damping on the driver(s) drops at extremely low ...
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QSC Audio UF-3 - page 7
5 Ultrasonic Filter An ultrasonic filter is useful for minimizing RF interference, oscillations, leakage or aliasing from digital devices, and other signals that are too high in pitch to hear but may wreak havoc in an amplifier system. Program settings: 1. Set the jumper on Jx01 to enable the low-pass filter (across pins 2 and 3). 2. Set the jumper ...
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QSC Audio UF-3 - page 8
6 2-Way Active Crossover 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-ba ...
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QSC Audio UF-3 - page 9
7 Ch. 2 Ch. 1 UF-3 PowerLight 1.6 HVX Ch. 2 Ch. 1 UF-3 PowerLight 3.4 (parallel mode) Ch. 2 Ch. 1 UF-3 PowerLight 4.0 (bridged mode) Ch. 1: Ch. 2 LP @ 150 Hz; HP @ 20 Hz Bypassed UF-3: Subwoofer Ch. 1: Ch. 2 LP @ 1000 Hz; HP @ 150 Hz LP @ 1000 Hz; HP @ 150 Hz UF-3: W oofers Ch. 1: Ch. 2 LP @ 5 kHz; HP @ 1000 Hz LP @ 20 kHz; HP @ 5 kHz UF-3: Mids &a ...
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QSC Audio UF-3 - page 10
8 Tools and materials you will need: Soldering iron Desoldering iron or other suitable desoldering equipment Phillips screwdriver Wire cutters Rosin-core solder CAUTION: • Do not use desoldering braid because it may damage the solder pads on the BusCard or input board, and it also might not adequately remove solder. • The UF-3 contains active c ...
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QSC Audio UF-3 - page 11
9 Continue preparing the PC board by removing solder from all 22 in-line socket holes. Once this is done, you are ready to install the UF-3. With the input panel facing you and the component side of the UF-3 board facing away from you, carefully insert the header pins of the UF-3 fully into the socket holes. Turn the assembly over and solder the UF ...
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QSC Audio UF-3 - page 12
10 VII. TECHNICAL ASSIST ANCE & SERVICE Servicing your QSC product requires a trained and qualified technician. There are no user serviceable components inside, and the danger of electric shock exists. Additionally, some of the components are QSC-specific parts that require QSC replacements. Comprehensive service manuals for most models are ava ...
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QSC Audio UF-3 - page 13
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QSC Audio UF-3 - page 14
12 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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