User manual ELECTRO-VOICE 668 DATASHEET
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Manual abstract: user guide ELECTRO-VOICE 668DATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] All instructions concerning the handling of MOS - circuits have to be observed.
SAFETY COMPONENT (HAS TO BE REPLACED WITH ORIGINAL PART ONLY)
Introduction . 9 10 11 13 20 21 24
DESCRIPTION First of all, we would like to express our thanks and at the same time congratulate you on the decision to buy one of our CONTRACTOR PRECISION SERIES power amplifiers. Electro-Voice CONTRACTOR PRECISION SERIES amplifiers are made to meet the highest requirements of any on-the-road application. Thus they provide on-board protection against thermal and capacitive overload, short-circuit and the occurrence of HF or DC at the output. [. . . ] Additionally, special circuitry prevents the output-stage transistors from being damaged by Back-EMF. During soft start, delayed switching of the power outputs is accomplished via relays and a limiter controls the initial current inrush, preventing the mains fuse from being blown during the power-on operation. The mechanical construction as well is carried out following the highest precision standards of the industry. The robust steel chassis provides extreme rigidity and it is meant to live through any hard wearing condition of a touring application. Thermal stability is guaranteed by two 4-Mode silently running fans that offer the possibility to also use the amplifiers in a studio environment. The extensive comparator circuitry constantly monitors the input and output signals and activates the internal limiters whenever a non-linear operational state is encountered. This provides reliable protection of the connected loudspeaker systems against overload and clipping. The sound quality of the CONTRACTOR PRECISON SERIES power amplifiers is superb. 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 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. PROTECT When this LED lights up during operation, one of the protection circuits against over-temperature, overload, shorted outputs, radio frequency interference or DC faults has been triggered. In case of overheating, wait a little until the amplifier switches back to operating mode itself. The loudspeaker outputs are switched on via delayed relays so that no startup transients are audible. A current limiter prevents startup peaks on the mains line and prevents the mains fuse from blowing.
POWER AMPLIFIER INPUTS
Parallel to the XLR-type inputs, output connectors are provided, offering the opportunity to feed additional power amplifiers with the same signal. The inputs are electrically balanced with pin-assignment according to the IEC 268 standard. Pin-assignment of the XLR-type input connectors:
PIN 1: PIN 2: PIN 3:
SHIELD a, + b, -
Input sensitivity is factory set to 0 dBu. The power amplifier can be set internally to +6dBu input sensitivity or to +26dBu gain.
PARALLEL MONAURAL Setting the selector switch to the PARALLEL/MONO position puts the channel A and channel B inputs in electrically direct parallel configuration, leaving you still the possibility to control the channels' level settings separately, using the output controls A and B. DUAL STEREO When the selector switch is set to its DUAL/STEREO position both channels are amplified individually.
POWER AMPLIFIER OUTPUT CONNECTORS SPEAKON output connectors are provided for the power amplifier channels A (left) and B (right). The Bridged Out Connector for bridged operation is sealed with a plastic cover to prevent connection errors.
LIMITER The time constant of the built-in limiter to avoid overdriving is adjustable. Position "SLOW" is the factory preset and this should also be the normal position. If the power amplifier is used as a MID/HI-frequency amplifier in active multi-way systems, the limiter switch should be set to "FAST". [. . . ] If the power amplifier is used as a MID/HI-frequency amplifier in active multi-way systems, the limiter switch should be set to "FAST". If the power amplifier is used as LOW-frequency amplifier in active multi-way systems, the limiter switch should be set to "SLOW". BRIDGED MODE Slide switch to change from Normal Stereo mode to Bridged mode. 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. [. . . ]
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