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Electro-Voice CPS 2-Channel

Downloads

CPS Series Brochure (pdf)

CPS 2-Channel Manual (pdf)

Installation

1. Controls, Indicators and Connections

• 1. Level Indicators for channels 1 and 2
• 2. Protections Indicator (PROTECT)
• 3. Muting Indicator (MUTE) for channels 1 and 2
• 4. Power On/Off Indicator (POWER)
• 5. Standby Indicator (STANDBY)
• 6. Remote Amplifier Indicator (IRIS-Net)
• 7. Mains Switch

• 1. Mains Input
• 2. Ground Lift Switch (CIRCUIT ⊥ TO CHASSIS SWITCH)
• 3. POWER REMOTE connector
• 4. Power On Delay selection switch (ON DELAY)
• 5. Expansion Slot
• 6. Audio Inputs (INPUT) for channels 1 and 2
• 7. Input Level Control (LEVEL) for channels 1 and 2
• 8. Power Amp Mode Switch (MODE)
• 9. Highpass Filter Switch (HPF)
• 10. Type Plate
• 11. Power Amp Outputs (CH 1, CH 2, BRIDGED)

2. Opearting Voltage

The power amplifier receives its power supply via the MAINS IN connector. Only the provided power cord may be used. During installation, always separate the power amplifier from the mains. Connect the power amplifier only to a mains network, which corresponds to the requirements indicated on the type plate.

The power drawn from the mains network is converted into output power to feed the connected loudspeaker systems and into heat. The difference between power consumption and dispensed power is called power dissipation (P_d). The amount of heat resulting from power dissipation might remain inside of a rack-shelf and needs to be diverted using appropriate measures.

3. Mains Switch

The Mains Switch on the front panel separates the power amp from the mains. Turning the Mains Switch to ON starts booting up the power amp. A soft start circuit compensates mains inrush current peaks and thus prevents triggering AC mains fuse when switching on the amplifier. Speaker system switch-on is delayed by approximately 2 seconds via output relays, effectively suppressing any possible power-on noise, which otherwise might be heard through the loudspeakers. PROTECT LED light and fans are at high speed during this delay. This indicates all protections are working fine.

4. Mounting

CPS amplifiers have been designed for installation in a conventional 19-inch rack case. Attach the power amp with its frontal rack mount ears using 4 screws and washers as shown in following illustration. Additionally securing the amplifier at the rear becomes necessary, if the rack case in which the power amplifier has been installed will be transported. Failure to do so may result in damage to the power amplifier as well as to the rack case. Attach the power amp as shown in the illustration using 4 case nuts and screws. Brackets for securing the power amplifier are available as accessories.

5. Ventilation

As with all Electro-Voice power amps with fan cooling, the airflow direction is front-to-rear, obviously because there is more cold air outside of the rack case than inside. The power amplifier remains cooler and dissipating the developing waste heat in a specific direction gets easier. In general, setting up or mounting the power amplifier has to be done in a way that fresh air can enter unhindered at the front and exhausted air can exit at the rear. When installing the power amp in a case or rack system, attention should be paid to these details to provide sufficient ventilation. Allow for an air duct of at least 60 mm x 330 mm between the rear panel of the power amplifier and the inner wall of the cabinet/rack case. Make sure that the duct reaches up to the cabinet’s or the rack case’s top ventilation louvers. Leave room of at least 100 mm above the cabinet/rack case for ventilation. Since temperatures inside of the cabinet/rack case can easily rise up to 40°C during operation of the power amp, it is mandatory to bear in mind the maximum allowable ambient temperature for all other appliances installed in the same cabinet/rack case.

CAUTION:
Blocking/closing the power amp’s ventilation louvers is not permissible. Without sufficient cooling/ventilation, the power amplifier may automatically enter protect mode. Keep ventilation louvers free from dust to ensure unhindered airflow.
Do not use the power amplifier near heat sources, like heater blowers, stoves or any other heat radiating devices.
To ensure trouble-free operation, make certain that the maximum allowable ambient temperature of +40°C is not exceeded.

For fixed amplifier installations in a device control room that incorporate a central air-cooling system or air conditioners, calculating the maximum heat emission may be necessary.

6. Groundlift
	The ground lift switch allows eliminating noise loops. When operating the power amplifier together with other equipment in a rack case, setting the switch to the GROUNDED position is recommended. Set the switch to UNGROUNDED, when the power amplifier is operated together with appliances with differing ground potentials.
7. High Pass Filter (HPF)
	The Hi-Pass filter (50 Hz, 18 dB/oct) allows effective attenuation of low frequency audio signals, which could cause saturation problems with connected output transformers. Set the switch to the 50 Hz position for activating the High Pass Filter. Set the switch to the OFF position if no attenuation of low frequency audio signals is required.
8. Power on delay
	The ON DELAY switch at the amplifier rear panel allows selecting the power on delay time. Following table shows possible switch settings and corresponding delay times.

9. Selecting the Mode of Operation and Audio Output Cabling
The MODE switch on the power amp’s rear panel defines how the audio inputs handle the input signals. Possible settings are DUAL, PARALLEL or BRIDGED.
DUAL
	In DUAL mode, the two channels of the power amplifier work independent from each other. This mode of operation is being used for all 2-channel applications, like stereo operation. Using the input level controls on the power amp’s rear panel allows independently adjusting the channels’ amplification.
PARALLEL
	In PARALLEL mode, the inputs of channel 1 and channel 2 are directly electrically linked. The audio signal has to be applied to the input connectors of channel 1. Using the input level controls to independently control the amplification of the two channels is still possible because only the channels’ input are linked. PARALLEL operation is the mode of choice, whenever the same input signal drives multiple power amp channels of a large system installation.
CAUTION: In PARALLEL mode, the input signal has to be fed to input channel 1 only.
See illustration right for connecting speakers in DUAL or PARALLEL mode. The correct connection is also indicated at the amplifiers rear panel.
BRIDGED
	In BRIDGED mode both amp channels work in push-pull operation to provide doubled output voltage. The audio signal has to be applied to the input connectors of channel 1, amplification is set via input level control of channel 1 only.
CAUTION: In BRIDGED mode, the input signal has to be fed to input channel 1 only. Amplification is set via input level control of channel 1 only. In BRIDGED mode operation, it is not allowable for the load connected to fall below a value of 4 ohms. Extremely high voltages can be present at the output. The connected speaker systems must be able to handle such voltages. Make sure to completely read and fully observe power rating specifications of the speaker systems to be used and to check them against the output power capacity of the power amp.
Setting the MODE switch on the power amp’s rear panel to BRIDGED lets the power amplifier run in bridged mode operation and speaker connection has to be established using pins 1+ and 2-, see illustration right. The correct connection is also indicated at the amplifiers rear panel.
10. Audio Input Cabling
	Inputs are electronically balanced. Whenever possible, using balanced audio signal feeds at the input of the power amplifier is always preferred. Unbalanced connections should only be used if the cables are very short and no interfering signals are to be expected in the vicinity of the power amplifier. In this case, bridging the screen (shielding) and the pin of the inverting input inside of the connector is mandatory. Otherwise, a 6 dB drop in level could result. Please also see following illustration. Due to their immunity against external interference sources, such as dimmers, mains connections, HF-control lines, etc., using balanced cabling and connections is always preferable.
Balanced / unbalanced connection of input