Peavey CKS Series PowerSave, Thermal Emissions, Mode Configuration, Two Channel Stereo Mode

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.

Stereo Mode Connection Diagram
		-	+
		CLASS 2 WIRING
		MAY BE USED
		Output						Level	4	5	6
	+8 to 18VDC	–						A	3		7
								2
	20 mA	A									8
LISTED 8B42		+						1			9
COMMERCIAL									0		10
POWER	In
AMPLIFIER								Level	4	5
120V~60 Hz 15A	Out	+									6
	Com				Input A	Input B		B	3		7
				+		+		2			8
		B			–		–
	NEC							1			9
	CLASS 2 ONLY	–							0		10
		Signal
		Ground
		Lift
		Jumper
	Model							Model
	CC-STL							CC-IPB
		-	+	+	-	+	-

Regardless of operating mode, NEVER connect amplifier outputs together!

Parallel Mode Diagram
		-	+
		CLASS 2 WIRING
		MAY BE USED
		Output						Level	4	5	6
	+8 to 18VDC	–						A	3		7
	20 mA	A						2			8
LISTED 8B42		+						1			9
COMMERCIAL									0		10
POWER	In
AMPLIFIER								Level	4	5
120V~60 Hz 15A	Out	+									6
	Com				Input A		Input B	B	3		7
								2			8
		B		+	–	+	–
	NEC	–						1			9
	CLASS 2 ONLY								0		10
		Signal
		Ground
		Lift
		Jumper
	Model							Model
	CC-STL							CC-IPB
		-	+	+	-

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.

Bridged Mono Mode Connection Diagram.
		CLASS 2 WIRING
		MAY BE USED
		Output				Level	4	5	6
		–
	+8 to 18VDC					A	3		7
	20 mA	A				2			8
LISTED 8B42		+				1	0		9
COMMERCIAL									10
POWER	In
AMPLIFIER						Level	4	5
120V~60 Hz 15A	Out	+							6
	Com		Input A		Input B	B	3		7
						2			8
		B	+ –	+	–
	NEC					1			9
		–
	CLASS 2 ONLY						0		10
		Signal
		Ground
		Lift
		Jumper
	Model					Model
	CC-STL					CC-IPB
		- +	+ -
			Ch.A

Bridged Mono Mode - CKV & CKX Series.

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.

Crest Audio CK Power Processing Amplifiers Page 5