User manual QSC AUDIO UF-3 UNIVERSAL FILTER

[. . . ] Owner's Manual UF-3 Universal Filter *TD-004031-00* *TD-004031-00* Rev. 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-7 BusCard installed) PowerLight models PL 1. 0, PL 1. 0HV, PL 1. 4, PL 1. 5X, PL 1. 6HVX, PL 1. 8, and PL 2. 0HV (with a BSC-2 or BSC-4 BusCard installed) PowerLight models PL 3. 4, PL 3. 8X, and PL 4. 0 (with a BSC-6 BusCard installed) All MXa models (MX 1000a, MX 1500a, MX 2000a, and MX 3000a; Note: does not include MX 700), which use Level 1 Open Input Architecture All EX models (EX 800, EX 1250, EX 2500, and EX 4000), which use Level 2 Open Input Architecture Legacy CX models CX6, CX6T, CX12, and CX12T, which use Level 1 Open Input Architecture Using the UF-3 as a default crossover or EQ is ideal for rental sound systems, since it virtually eliminates the possibility of unauthorized tampering with settings or other such user errors. Physically, the UF-3 is a small circuit card that mounts inside the amplifier. [. . . ] Insert a resistor network in RNx04 that corresponds to the desired low-frequency roll-off. Subsonic Filter with CD Horn EQ Use settings 1, 2, and 4 from the Subsonic Filter, and setting 3 from the CD Horn Equalization Filter. This would be suitable only if the loudspeaker system uses passive crossovers. CD Horn boost Subsonic roll-off Figure 7--UF-2 as a subsonic filter with CD horn EQ Subsonic and Ultrasonic Filter Use settings 2, 3, and 4 from the Subsonic Filter along with 2 and 3 from the Ultrasonic filter. Typ. Figure 9 depicts an example of a 4-way system. Because of the multitude of possible system configurations, the fundamentals of the technique used in the example will be explained below, with a few specifics. The actual crossover frequencies you should use will depend on your speaker system. UF-3: Mids & Highs Subwoofer The subwoofer subsystem in the example is driven by a bridged amplifier. Channel 1 of the UF-3 in this amplifier is set with the highpass filter at 20 Hz (for subsonic filtering) and the low-pass at 150 Hz, which is the crossover point to the woofers. Channel 2 of the UF-3 is bypassed. BSC-2 BusCard Ch. 1 PowerLight 1. 6 HVX Woofer The woofers are driven by an amplifier operating in the parallel mode. Both channels of its UF-3 are set with the high-pass filter at 150 Hz (the crossover point from the subwoofers) and the low-pass filter at 1 kHz. UF-3: Woofers Ch. 2 LP @ 1000 Hz; HP @ 150 Hz Midrange and High Frequencies The remaining speakers are driven by the same amplifier: the mids by channel 1, and the highs by channel 2. The settings for channel 1 of the UF-3 are: high-pass at 1 kHz (the crossover from the woofers) and low-pass at 5 kHz (the crossover point to the high-frequency drivers). Channel 2 of the UF-3 is set for high-pass at 5 kHz. For ultrasonic protection, the low-pass is set at 20 kHz. BSC-6 BusCard Ch. 1 PowerLight 3. 4 (parallel mode) UF-3: Subwoofer Ch. 1 PowerLight 4. 0 (bridged mode) Figure 10--Multiple amplifiers with UF-3s, set up for 4-way crossover operation V. INSTALLATION Installating the UF-3 requires PC board soldering skills, so only qualified service technicians should attempt it. Any authorized QSC service center--or, for an additional installation fee, QSC Technical Services Group--can perform the installation. The UF-3 installs on a BusCard, which mounts inside the amplifier. Make sure you have the right BusCard for the amplifier model. The UF-3 also installs on the amplifier input PC board of any QSC EX, MXa, or legacy CX Series amplifier. Some older EX amplifiers may require an upgrade to the current input board. Contact the QSC Technical Services Group for details on compatibility with older EX amplifiers. [. . . ] guarantees the UF-3 to be free from defective material and/or workmanship for a period of three 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 via prepaid transportation with proof of purchase (sales receipt). This warranty provides that examination of the returned product must disclose, in our judgment, a manufacturing defect. This warranty does not extend to any product which has been subject to misuse, neglect, accident, improper installation, or on which the date code has been removed or defaced. 9 VII. TECHNICAL ASSISTANCE & SERVICE Servicing your QSC product requires a trained and qualified technician. [. . . ]