User manual ELECTRO-VOICE CPS-1

[. . . ] The wide blade or the third prong are provided for your safety. 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. [. . . ] Using comprehensive dimensioned power supply units with low-interference toroidal transformers gains a headroom that exceeds the nominal power handling capacity by far. No V/I-Foldback-Limiter circuits are employed within the power amplifiers, making it possible to operate the amps on complex loads up to ±90° phase angles without a problem. The electronically balanced inputs are provided via XLR-type and PHOENIX connectors which are also used to loop the signal through. Using the Input Routing-switches lets you determine if the CONTRACTOR PRECISION SERIES amplifiers are operated in DUAL (stereo) or PARALLEL (monaural) mode; "monobridged" 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 are carried out as 4-pole-barrier-strip 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. LIMIT This indicator lights when the amplifier enters clipping and the internal limiter is activated. Short-term indication is permissible while a continuous lit LED signals that reducing the overall volume is recommended to avoid the connected loudspeaker systems from being damaged by overload conditions. 2. [. . . ] The two amplifiers A+B are now used in pushpull operation providing the double output voltage at the BRIDGED-OUT connector. The regular output voltages of the power amplifiers A and B are still present at the individual output connectors CHANNEL A and CHANNEL B but, in respect to the inverted phase, using these signals is not recommendable. Bridged mode operation with loads of 2 ohms is not admissible. GROUND-LIFT SWITCH The ground-lift switch is meant to help you in avoiding ground noise loops. [. . . ]