User manual ELECTRO-VOICE CPS4

[. . . ] 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. Refer all servicing to qualified service personnel. 1. [. . . ] The input facilities are carried out as balanced XLRF-type sockets while the Direct-Outs ­ on which the carried-through signals are present ­ come as XLRM-type connectors. Using the Input Routing-switches lets you determine if the CONTRACTOR PRECISION SERIES amplifiers are operated in DUAL (stereo) or PARALLEL (monaural) mode; "mono-bridged" operation is also possible. The dB-scaled level controls are to be found on the rear panel. These potentiometers guarantee precise and reliable operation. The easy readable LED display offers quick optical information on the power amplifiers' momentary operational mode. For each channel individually the display shows whether they are operational, a signal is present at the outputs, when the limiters are activated, and whether one of the protection circuits has been engaged or not. The power outputs CANNEL A, CHANNEL B and BRIDGED OUT are carried out as Speakon connectors. A ground-lift switch that separates the enclosure from the appliance's ground potential and therefore helps to eliminate ground noise loops and the mono bridged mode switch are also located on the rear panel. In normal operation all CONTRACTOR PRECISION SERIES power amplifiers can be used to drive loads down to 2 ohms; in bridged mode the minimal load is 4 ohms. All amps are equipped with extremely silent running fans providing front-to-rear air circulation, guaranteeing trouble-free operation even in smaller power amplifier rack systems. Studying this owner's manual carefully will provide you with further and more detailed information about the CONTRACTOR PRECISION SERIES power amplifiers. Thus we recommend to keep on reading, assuring you that the Electro-Voice CONTRACTOR PRECISION SERIES power amplifiers will provide you with a lot of fun and satisfaction in your work. 9 FRONT PANEL 1. Level Control To prevent unauthorized operation of the level controls on the CPS3 and CPS4, they are provided with screwed-on protective cover lids. When shipped from the factory, the detented potentiometers are set to their clockwise limits. Thus, the input signal is not attenuated. In case matching the input levels is required, you first have to detach (unscrew) the cover lids to gain access to the potentiometers. POWER ON INDICATION This LED lights up when the mains switch is pressed. If it does not light up, the unit is not connected to the mains or the mains fuse has blown. [. . . ] In Bridged mode the built-in power amplifiers operate in "push- pull" and the double output voltage from channel A and B appears at the Bridged output connector. The phases of Channel A and B are in opposite and therefore the individual channels must not be used as loudspeaker outputs. HI-LO-CUT FILTER This filter attenuates subsonic and high frequency signals so that the power amplifiers are not modulated with these signals. [. . . ]