User manual ELECTRO-VOICE 672 DATASHEET

[. . . ] Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is connected to the mains Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure), respectively between the mains poles has to be 3 mm and needs to be minded at all times. The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only rmissible when using original parts. [. . . ] By means of the separate BRIDGED OUTconnector and a Bridged Mode-switch, switching to , , Mono Bridged" operation is truly uncomplicated as well. The recessed mounted dB-scaled level controls ensure reliable protection against mechanical damage. These particularly precise, secure to operate detent-potentiometers are located on the front panel. CP-Series power amps provide the opportunity for retrofitting an internal analogue signal processor board with x-over and filter functions. The easily readable LED display provides a quick overview of the power amp's current operational status. The power outputs CHANNEL A, CHANNEL B and BRIDGED OUT are carried out as extremely durable SPEAKON-type connectors. Also located on the rear panel is a Ground-lift switch, which helps eliminating ground-noise loops by separating the power amp's enclosure from the circuit ground. In normal operation, all CP-Series power amps are capable of driving loads as low as 2ohms. in MonoBridged mode the allowable minimum load is 4ohms. This owner's manual outlines and explains several other features of your CP-Series power amplifier. Please, make sure to carefully read all of it and mind the instructions. In case of thermal overload you have to wait until the power amplifier automatically regains normal operation. The SIGNAL LED lights as soon as an audio signal of approximately 30dB below full modulation is present at the output. The LED is dimmed when speaker cables are short-circuited or a protection circuit has been activated. The 0dB LED lights whenever the power amplifier is driven at its maximum. Higher input voltage does not result in higher peak output voltage. In addition, the 0dB indicator comes in handy when adjusting external limiters. This indicator lights as soon as the integrated dynamic audio signal limiter is activated and the power amplifier is driven at the clipping limit or generally at its maximum capacity. Short-term blinking is not a problem, because the internal limiter controlls input levels of up to +21dBu down to a THD of approximately 1%. If, on the other hand, this LED lights constantly, reducing the volume is recommended to prevent the loudspeaker systems connected from being damaged by probable overload. To prevent distortion in mixing consoles connected to your CP-Series amp, setting these controls to a value between 0dB and -6dB is generally recommended. The XLR-type connectors OUTPUT A & OUTPUT B are prepared for , , through-connecting" input signals to additional external power amps. [. . . ] CAUTION: Extremely high voltages might be present at the BRIDGED OUT connector during Bridged-Mode operation. the connected loudspeaker systems have to be capable of handling such high voltages. Please make sure that power handling specifications as stated in the documentation supplied with your speaker systems match the specifications of the power amplifier. If the power amplifier is operated together with other equipment in a 19" rack-shelf, setting the switch to its GROUNDED position is recommended. [. . . ]