Electro Voice Automobile Alarm CPS 3 User Manual

OWNER’S MANUAL  
CPS 3 / CPS 4  
CONTRACTOR PRECISION SERIES  
 
DESCRIPTION  
CONTENTS  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
9
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 require-  
ments 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 CON-  
TRACTOR 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. 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.  
2. 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.  
3. INPUT INDICATION  
This LED lights up if a signal is present at the power amplifier input. The indicator does not light up when  
the input controls are turned down completely.  
4. OUTPUT INDICATION  
This LED lights up if a signal is present at the power amplifier output. The indicator goes off when the  
speaker line has shorted or a protective circuit has been activated thus indicating that there is no signal  
at the speaker output terminals.  
5. LIMIT  
This LED lights up if the limiter has been activated and the power amplifier is being operated at the clip  
level. If the LED flashes briefly, this is not a cause for concern. If this LED is lit permanently, the volume  
should be reduced to avoid overload damages to the connected loudspeaker systems.  
6. 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. The cause of the  
error e.g. a shorted loudspeaker line must be remedied. In case of overheating, wait a little until the  
amplifier switches back to operating mode itself.  
7. POWER Switch  
The unit is switched on via the power switch. 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.  
10  
 
REAR PANEL  
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: SHIELD  
PIN 2: a, +  
PIN 3: b, -  
Input sensitivity is factory set to 0 dBu.  
The power amplifier can be set internally to +6dBu input sensitivity or  
to +26dBu gain.  
INPUT ROUTING  
PARALLEL MONAURAL  
Setting the selector switch to the PARALLEL/MONO position puts the  
channel A and channel B inputs in electrically direct parallel configu-  
ration, 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.  
11  
 
REAR PANEL  
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 overdri-  
ving 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 LOW-frequency ampli-  
fier 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 ampli-  
fiers 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 oppo-  
site and therefore the individual channels must not be  
used as loudspeaker outputs.  
HI-LO-CUT FILTER  
This filter attenuates subsonic and high frequency si-  
gnals so that the power amplifiers are not modulated with  
these signals. This switch should normally always be in  
position ON. The OFF position is only for applications  
where an upstream unit, e.g. a crossover or a equalizer,  
has integrated HI-Cut and LO-Cut filters.  
GROUNDLIFT SWITCH  
Hum loops can be avoided with the groundlift switch. If  
the power amplifier is operated together with other units  
in one 19" rack, the switch should be in GROUNDED  
position. If the power amplifier is used with units which  
have different earthing potentials, the switch should be  
adjusted to the UNGROUNDED position.  
12  
 
SPECIFICATIONS  
Technical Specifications: CPS3, CPS4  
Amplifier at rated conditions, both channels driven with 8 ohms loads, unless otherwise specified.  
CPS3  
CPS4  
Load Impedance  
8 W  
4 W  
2 W  
8 W  
4 W  
2 W  
Maximum Midband Output Power  
THD=1%, 1kHz  
560W 900W 1200W  
500W 800W 1000W  
1800W 2400W ———  
72V  
850W 1300W 1800W  
750W 1200W 1500W  
2600W 3600W ———  
91V  
Rated Output Power  
THD< 0.1%, 20Hz ... 20kHz  
Maximum Bridged Output Power  
THD=1%, 1kHz  
Maximum RMS Voltage Swing  
THD=1%, 1kHz  
Voltage Gain  
at 1 kHz  
37dB  
39dB  
Slew Rate  
35V/µs  
1300W  
40V/µs  
1850W  
Power Consumption  
at 1/8 maximum output power @ 4 W  
Input Sensitivity  
0dBu ( 775mV)  
at rated output power @ 4 W, 1 kHz  
THD at rated output power,  
MBW=80kHz, 1 kHz  
< 0.05 %  
< 0.01 %  
< 0.01 %  
<-70 dB  
IMD-SMPTE  
60 Hz, 7 kHz  
DIM30  
3.15kHz, 15 kHz  
Crosstalk  
ref. 1kHz, at rated output power  
Frequency Response  
-1dB, ref. 1 kHz  
13Hz ... 40kHz  
10Hz ... 48kHz  
20kW  
Power Bandwith  
THD=1%, ref. 1kHz, half power @ 4 W  
Input Impedance  
20Hz ... 20 kHz, balanced  
Damping Factor  
at 100Hz / 1kHz  
>400 / >300  
Signal to Noise Ratio  
A-weighted  
105dB  
Power Requirements  
Protection  
230V, 50Hz ... 60Hz  
Audio limiters, High temperature, DC, HF, Back-EMF,  
Peak current limiters, Inrush current limiters, Turn-on delay  
Front-to-Rear, 4-stage-fans  
Cooling  
Safety Class  
I
Dimensions (W x H x D), mm  
Weight  
483 x 132.5 x 385.5  
27kg  
29kg  
Retrofitting kit  
Input Transformers  
NRS 90176  
13  
 
BLOCK DIAGRAM  
20  
 
ABMESSUNGEN/DIMENSIONS  
Abmessungen/Dimensions (in mm)  
21  
 

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