User manual ELECTRO-VOICE 655 DATASHEET
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Manual abstract: user guide ELECTRO-VOICE 655DATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
For US and CANADA only:
Do not defeat the safety purpose of the grounding-type plug. When the provided plug does not fit into your outlet, consult an electrican for replacement of the absolete outlet.
IMPORTANT SERVICE INSTRUCTIONS
CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. [. . . ] When mounting the power amplifier inside of a closed rack system, it is recommended to use special rack-rails or optionally available rack-mount ears NRS 90235 (112733) to prevent bending of the appliance's front panel.
For maintained trouble-free operation of the appliance, the maximum admissible ambient temperature of +40°C is not to be exceeded.
The amplifier has to be protected from: - water drops or splashes - direct sunlight - high ambient temperatures and the direct radiation of heat sources - high humidity and moisture - heavy dust - massive vibrations Moving the amplifier from a cold into a warm environment can result in the occurrence of condensation on inner parts. Operating the appliance is only permissible after it has accommodated to the altered temperature (approximately after one hour). Should any foreign solid parts or liquids inadvertently intrude the enclosure, immediately unplug the device from the power source and have it checked at a DYNACORD service center, before further use. Cleaning the appliance should not be performed using chemical solvents or sprays, as this might damage the finish and could even cause hazard fire.
Before The First Operation Before switching the amplifier's power on, the included mains cord has to be connected to a 230 V - 50/60 Hz wall outlet. On the appliance itself, the cord has to be connected to the 3-pole mains socket. To remotely start the amplifier, it is necessary to connect an external 24 V power source to the terminal strip POWER REMOTE. Providing correct connection and with an external power supply being present, the POWER ON indicator will light and the power amplifier is ready for operation. The mains switch POWER on the rear of the appliance is meant for service and maintenance purposes only. Through bridging the mains switching relay this option provides the possibility to operate the amplifier without an external 24 V power supply connected.
Caution The mains switch POWER on the rear of the appliance is only meant for maintenance. Remotely switching off the device is not possible when the POWER switch is engaged. The DPA-Series power amplifiers employ power-on switching delays of approximately 2 seconds.
Inputs INPUT CHANNEL A&B With an input sensitivity of 775 mV = 0 dBu and an input impedance of 20 k ohms, the electronically balanced inputs INPUT CHANNEL A&B are meant for the connection of control amplifiers, audio controllers, mixing consoles, etc. If the BRIDGED-MODE switch is engaged, the audio input signal has to be fed via the CHANNEL A input while the CHANNEL B input is without function. The signal is internally inverted and the power amplifier stage B is driven by that inverted signal. The power amplifier stage A is still driven by the unaltered incoming audio signal. Bridged mode operation is possible with using the isolated and/or the direct outputs. When using the isolated outputs, bridging the () binding posts of channels A and B is mandatory, using short cables with suitable diameter (1. 5 mm2 . . . Careful consideration of the loudspeaker systems' correct connection is important in preventing phase correlation problems. Channel A carries the signal "in phase" and therefore has to be connected to the (+)-pole of the correspondent loudspeaker system while the loudspeakers ()-pole has to be connected to the (+)-output connector of channel B. The output voltage of each power amplifier stage A&B is present at the binding post strip, but utilization is not recommended because of the negative correlation.
output connection in 50 V bridged mode operation
*Caution!Driving 4 ohms loads at the direct output is not admissible in bridged mode operation. For details on nominal load impedance and nominal loads of the individual outputs in bridged mode operation, please refer to the specifications in the appendix. Also in bridged mode, the nominal load impedance is not to be declined.
GROUND Lift Switch The ground lift switch helps is a perfect means for eliminating possible ground noise loops. [. . . ] The limiters are activated only in case of the occurrence of non-linear conditions within the power amplifier; e. The limiters do not affect the power amplifier's overall dynamic range. Signal Indicator This indicator is lit when the audio signal exceeds 30 dB. In case short-circuits resulting from broken loudspeaker cables are detected or one of the power amplifier's protection circuits is activated, the signal indicator is dimmed. [. . . ]
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