User manual ELECTRO-VOICE PA4150L

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Manual abstract: user guide ELECTRO-VOICE PA4150L

Detailed instructions for use are in the User's Guide.

[. . . ] Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly obeyed. Congratulations on your ElectroVoice PA series power amplifier purchase The ElectroVoice PA-Series power amp line combines outstanding audio performance, exceptional reliability and secure operational safety in a compact 2RU chassis design. All models in the PA Series provide several protection circuits which not only prevent the power amplifier itself but also the connected loudspeaker systems from being damaged. these protections include Dynamic Audio Limiters , Inrush Current Limiter , Short Circuit Protection and Thermal Overload Protection. [. . . ] Loudspeaker outputs are activated via relay switching with a delay of approx. During this delay period, the Protect LED lights to confirm correct operation of the protection circuitry. Protect (PROT) A lit Protect LED indicates that one of the integrated protections against thermal overload, short-circuit has been activated. the audio channels protection circuits operate independent from each other. At the occurrence of failure or overload conditions the affected power amp channel is separated from the load connected via output relay, 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 returns to normal operation. Limiter The Limit indicator lights as soon as the integrated dynamic limiter is being activated and the power amp is driven at the clipping limit or generally at its maximum capacity. Short-term blinking is not a problem, because the internal limiter trims input levels of up to 21dBu down to a THD N of approximately 1 . If, on the other hand, this LED lights constantly, reducing the volume is strongly recommended to prevent the connected loudspeaker systems from being damaged by probable overload. Level Indication The level indicators signify the power amplifier s current modulation. Power The Power indicator lights when switching the power amplifier on. If the power on LED does not light please check to make sure the unit is plugged in or that the primary fuse is not blown. When screwed to the power amp, the screwlock connectors provided with the unit prevent accidentaldisconnection. Choosing balanced cables (2 conductors for audio signals separate shielding mesh) for LF-signal connection is generally recommended, even when the connected signal source does not provide balanced output signals. this is possible by ointly connecting conductor and shield on the source side (also refer to LF-Connection Cords). Level Controls The Level Controls allow setting the according power amp channel s overall amplification. To prevent distortion in mixing consoles connected to the amp, setting these controls to a value between - dB and 0dB is generally recommended. With the fourchannel model it is possible to independently select channels A and B or C and D. [. . . ] if the mains fuse blows repeatedly , please contact an authori ed service centre . Mains Socket Please, make sure to check whether the voltage selector is set to the correct mains voltage that matches the local mains supply at the installation site. Prior to switching the mains voltage, make sure to replace the mains fuse with an appropriate model. Please refer to the label on the rear of the enclosure indicating the correct values for different mains voltages. [. . . ]

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