K+H O 500 C Installation And Operation Manual
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Contents
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Page 7- Several levels of protection to avoid accidential mis-settings (user security levels)- Remote control and link functions of the monitors via RS 232 or MIDI- An output for an additional subwoofer is provided. FIR filtering for this output is provided insidethe O 500 C.Power amplifier:- The O 500 C is fitted with high-performance, state-of-the-art power amps, which can deliverclean 400 W RMS for the woofer, 230 W RMS for the midrange dome and 290 W RMS for thetweeter.- Stacked power-supply for better amplifier efficiency- Very low non linear distortions: woofer< -110 dB, midrange < -100 dB, tweeter < -90 dB1.3 Block DiagramIn Fig. 1.3/1 all modules which are included in the digital active studio monitor O 500 C can beseen. All modules shown are integrated in the monitor cabinet:- Digital controller- Three power amplifiers- PCB with display, IR-receiver and illuminated logo- PSU with torrodial transformer, PCB and regulators- 3 driversAll audio parameters, except for the power amplifiers, are controlled by the internal DSP. An analogsignal, connected to the O 500 C, will be A/D converted and then fed to the DSP, where all parametersselected are processed in the digital domain. When the signal has passed all stages in the DSP, itwill be D/A converted and then sent to the analog power amplifiers. The analog output signal to theexternal, optional subwoofer can be taken from the transformer-balanced XLR output on the rearof the monitor. The power amplifiers of the O 500 C have been designed in a bipolar topology andare built onto one PCB. Heavy-duty alloy heatsinks with a large surface allow for high powerperformance under „cool“ conditions.The digital controller consists of a DSP-PCB, which carries the A/D and D/A converters with theanalog input and output stages, plus the powerful DSP. A further PCB carries the microcomputerwhich contains the controller software plus the „core of the system“ the 8 Bit microcontroller.Both PCB’s are shielded in a MU-metal case to avoid hum and side noises.The VF display of the digital controller, the limit signalling and the IR receiver are mounted at thetop of the front baffle.The power supply system has separate voltages for the analog and digital signals, as well as forthe power amplifiers. On the DSP and the microcomputer PCB an additional stabilisation is provided,again separated for the A/D and the D/A signal paths. |
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