User manual ELECTRO-VOICE 671B DATASHEET
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Manual abstract: user guide ELECTRO-VOICE 671BDATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] 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 permissible when using original parts. [. . . ] front-to-rear ventilation allows trouble-free operation even in smaller amp-racks. The electronically balanced inputs are carried out via XLR-type connectors. Direct-Outs for through connecting the audio signal are also provided via XLRM-type connectors. input Routing allows selecting DUAL (stereo) or PARALLEL (monaural) operation mode. By means of the separate BRIDGED OUT-connector 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, when needed, helps eliminating ground-noise loops by separating the power amp's enclosure from the circuit ground. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception , which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Use the POWER switch located on the front panel to power-on the appliance. The soft-start function protects against current inrush peaks on the mains, which in addition prevents the mains line protection switch from activating during power-on. The loudspeaker outputs are activated via relay switching with a delay of approximately 3 seconds to efficiently attenuate eventual power-on noise. The PROTECT LED lights during the delay time and the fans run at maximum speed. Causes for the POWER-indicator not lighting are: the appliance is not connected to the mains network or a defective primary fuse. The PROTECT LED lights indicating that one of the internal protection circuits against thermal overload, short-circuit, Back-EMF, HF-occurrence at the output, etc. The output relays interrupt the connected loads from the power amps while input signals are interrupted as well, preventing the connected loudspeaker systems and the power amplifier itself from being damaged. 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. [. . . ] Whenever possible make sure to use the supplied mains cord for connecting the power amp to the mains network. Using a different mains cord with a smaller diameter results in higher leakage, consequently reducing the amplifier's maximum power output capacity. The following tables are useful in determining power supply and cabling requirements. The power drawn from the mains network is converted into acoustic output to feed the connected loudspeaker systems plus heat. [. . . ]
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