Peavey CKS Series User Manual download pdf (Page 7)

Crest Audio CK Power Processing Amplifiers Page 5

PowerSave.

All CK Power Processing amplifiers come standard with PowerSave

circuitry. This effectively reduces current draw and thermal emis-

sions to a minimum when the amplifier is at idle. PowerSave oper-

ates by cutting off the bias current to the output stage after signal

absence is sensed at the input. Once signal is present, PowerSave

instantly restores the bias current after the first positive-going wave-

form. Current draw specifications while PowerSave is active are

included in specifications under "Idle Current Draw."

Thermal Emissions.

System cooling needs must be considered before installation, and the

system installer/designer should specify appropriate countermea-

sures, such as ventilation, air conditioning, etc. Refer to the specifi-

cations appendix at the back of this manual for specific thermal

emissions figures.

Mode Configuration.

CK Power Processing amplifiers are configured standard for two

channel (stereo) operation. They can, however, be wired to operate

in bridged mono mode (a single Mono input amplified to the com-

bined power of both channels and made available as a single Mono

output) or parallel mode (where a single Mono input signal is fed to

both channels).

Two Channel (Stereo) Mode.

In the factory configured, standard two channel (stereo) mode, both

channels operate independently, individual input attenuators control-

ling their respective levels. Signal at Channel A’s input produces

output at Channel A’s output, while signal at Channel B’s input pro-

duces output at Channel B’s output. (Recommended minimum nomi-

nal load impedance for stereo operation of CKS Series amplifiers is

4 ohms per channel; 2 ohms per channel for models CKS 800-2,

1200-2, and 1600-2. CKV and CKX Series amplifiers are specifical-

ly designed for use with distributed or constant voltage systems. See

appendix E for information on recommended distributed line imped-

ance.). Connect loudspeakers to the barrier strip output connectors

for channels A and B. Connections are shown in the diagram below.

Parallel Mode.

To send the same signal to both channels, connect the input signal to

Channel A via the Input Barrier Strip. Run jumpers from the positive

and negative terminals of Channel A’s Input Barrier Strip to the

respective terminals of Channel B’s. Both channels then share

Channel A’s input signal, but will operate independently. Speakers

are connected as in Stereo Mode.

Bridged Mono Mode - CKS Series Power Amplifiers.

Bridged Mono Mode straps both amplifier channels together, making

a very powerful single channel amplifier. One channel “pushes” and

the other “pulls” equally, effectively quadrupling the power over that

of either channel alone. Signal is connected to the input barrier strip

as shown in the drawing below, with one jumper connecting the pos-

itive (+) terminal of Input A to the negative (-) terminal of Input B,

and another jumper connecting the negative (-) terminal of Input A

to the positive (+) terminal of Input B. Both channel attenuators

(A&B) are used to control signal level, and both must at the same

level, preferably at 0dB attenuation. The speakers are connected only

to the designated “+” output terminals as shown below.

Note: Use extreme caution when operating in bridged mono mode.

Never ground either side of the speaker cable when the amplifier is

in bridged mono mode; both sides are “hot.” If an output patch

panel is used, all connections must be isolated from each other and

from the panel. For CKS Series amplifiers, the recommended mini-

mum nominal load impedance in bridged mono mode is 8 ohms, the

equivalent to driving both channels at 4 ohms. [For models CKS

800-2, 1200-2 and 1600-2, the recommended minimum nominal load

impedance in the bridged mono mode is 4 ohms, equivalent to dri-

ving both channels at 2 ohms].

Note: Driving loads of less than the recommended minimums will

activate the IGM circuitry, resulting in a loss of power, and may also

cause a thermal protect condition.

LISTED 8B42

COMMERCIAL

POWER

AMPLIFIER

120V~60 Hz 15A

Com

Out

+8 to 18VDC

20 mA

CLASS 2 WIRING

MAY BE USED

Output

–

Signal

Ground

Lift

Jumper

Input A

Input B

–

Model

CC-IPB

Level

NEC

CLASS 2 ONLY

Model

CC-STL

- +

LISTED 8B42

COMMERCIAL

POWER

AMPLIFIER

120V~60 Hz 15A

Com

Out

+8 to 18VDC

20 mA

CLASS 2 WIRING

MAY BE USED

Output

–

Signal

Ground

Lift

Jumper

Input A

Input B

–

Model

CC-IPB

Level

NEC

CLASS 2 ONLY

Model

CC-STL

- +

LISTED 8B42

COMMERCIAL

POWER

AMPLIFIER

120V~60 Hz 15A

- +

NEC

CLASS 2 ONLY

Com

Out

+8 to 18VDC

20 mA

CLASS 2 WIRING

MAY BE USED

Output

–

Signal

Ground

Lift

Jumper

Input A

Input B

–

Model

CC-IPB

Level

Ch.A

Model

CC-STL

Parallel Mode Diagram

Stereo Mode Connection Diagram

Bridged Mono Mode Connection Diagram.

CKV and CKX Series amplifiers can also be

wired for Bridged Mono mode operation.

However, bridging these models is usually unde-

sirable, as the resultant output will be approxi-

mately 140V (CKV) or 200V (CKX)! There are,

however, specific applications for this configura-

tion. Contact Crest Audio Customer Service for

more information if required.

Regardless of operating mode, NEVER

connect amplifier outputs together!

Bridged Mono Mode - CKV & CKX Series.

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