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JBL Professional MPC-XU manual

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Table of contents for the manual

  • Page 1

    1 MPC-XU Universal Crossover For JBL MPC and MP A amplifiers Owner’ s Manual and Installation Guide I. Description T he MPC-XU is a dual-c hannel univ ersal crosso ver filter accessory for use with JBL MPC and MP A po wer amplifiers . T he MPC-XU is user configurable to fulfill these functions:  activ e crossov er  bandpass filter  subso[...]

  • Page 2

    2 II. Installation CAUTION: T he MPC-XU contains acti ve components whic h can be damaged by electro- static discharge (ESD). Be sure to practice standar d ESD precautions , and al wa ys g round yourself and y our w or ksta tion bef ore handling exposed cir cuit cards . Installing the MPC-XU requires PC boar d soldering skills . Onl y qualified ser[...]

  • Page 3

    3 Figure 5. The MPC-XU’ s switches, jumpers, and resistor networks. III. Programming the MPC-XU T he MPC-XU boar d has four switc hes, six 3-pin headers , and four SIP resistor netw ork sock ets (see Figure 3). All these are used for pr og ramming the module . The circuitr y for the two c hannels is identical, so the switc h es , headers and soc [...]

  • Page 4

    4 Programming the low -pass filter Bypass/ena ble header T o use the low-pass filter , set the jumper on Jx01 across pins 2 and 3, whic h ar e the lo wer two pins on their header . But if y ou do not wish to use the low-pass filter and w ant to bypass it instead, set the jumper across pins 1 and 2. Setting frequency  T o set the corner freque[...]

  • Page 5

    5 IV . T ypical configurations Subsonic Filter (Infrasonic Fi lter) Appli cations: Subsonic filters are commonl y used in sound installations to filter out r umbles and other inaudible or unwanted lo w frequenc y signals and to protect speak er tuned vented speakers fr om damag e due to ex cessiv e energ y belo w the tuning frequency . F or a subso[...]

  • Page 6

    6 Ultrasonic Filter Applications: An ultrasonic filter is useful f or minimizing RF interference, oscilla tions, leakag e or aliasing fr om digital de vices , or other signals that are too high in pitc h to hear but may wreak hav oc in an amplifier system. T ypical ultrasonic filters are set at 16 kHz or 20 kHz. Prog ram settings: 1 Set Jx01 to ena[...]

  • Page 7

    7 MPC-XU 2- W a y A c tive Cr os s ove r T his configuration routes the frequencies belo w a particular frequency to amplifier Channel 1, which will dri v er the low-frequency speak er(s), and the frequencies abov e to Channel 2, whic h will driv e the high-frequency speaker(s). Using the MPC-XU as a cr ossov er r equir es that y ou drive both ampl[...]

  • Page 8

    8 Appendix Identifying resistor networks Use this chart to identify the v alues of the resistor netw or ks . See the tables on pag e 4 to find the correct values f or the desired filter frequencies . Use only these three digits to determine resistance code. Disregard the other numerals and letters. RESIST ANCE 2.7K 3.9K 4.7K 5.6K 6.8K 8.2K 10K 12K [...]