Peavey CS 1200 User Manual

INSTALLATION AND CONNECTION
The Peavey CS-1200 Commercial Series Power Amplifier is designed for durability in commercial installations and the quality of
performance required instudioand home applications. The CS-1200 is adual-channel power amplifier capableof delivering more than 600
watts RMS per channel intoa4ohm load continuously (both channels). The unit is of thestandard 19" rack mount configuration requiring 7"
rack height and is cooled by an automatic two-speed internal fan. All inputs and outputs are on the back panel. The front panel contains
various LED indicators for power output level, DDT activation and thermal shutdown, detented/'calibrated sensitivity controls and a
heavy-duty mains power switch.
Mains Power Source
The CS-1200 is fitted with a single heavy-duty #14 AWG, three-conductor line cord and a conventional AC plug with aground pin. It should
be connected to an independent circuit capable of supporting at least 20 amps continuously or greater. This is particularly critical for
sustained high power applications. If the socket used does not have a ground pin, a suitableground lift adaptor should be used and the third
wire grounded properly. Never break off the ground pin on the CS-1200. The use of an extension cord should be avoided, but if necessary,
always use a three-wire type with at least a 14 AWG wire size. The use of a lighter wire will severely limit the power capability of this amplifier.
Always use a qualified electrician to install any necessary electrical equipment. To prevent the risk of shock or fire hazard, always check to
see that the amp is properly grounded.
NOTE: The CS-1200 could cause a 15 amp circuit breaker to trip during turn-on.
Industrial and Commercial Installations
For commercial and other installations where sustained high power operation is required, the amplifiers should be mounted in a standard
19" rack It is not necessary to leave rack space between each amplifier in the stack since the fan pulls air in from the rear and exhausts the hot
airout the front. An adequatecool air supply must be provided for the amplifiers when rack mounted. The internal fan must have a source of
air that is not preheated by other equipment. The amplifier will start up in low speed fan operation and will normally stay at low speed
operation unless sustained high power operating levels were to occur. Then as the amplifier heat sinks heat up, the automatic thermal
sensing circuitry will cause high speed operation to occur. Depending upon signal conditions and amp loading, high speed fan operation
may continue or it may cyclo continuously between high and low. This situation is quite normal. If cooling is inadequate dueto preheated air
or a reduction of air flow occurs due to blockage of the amplifier inlet/outlet ports or if the amplifier is severely overloaded or short-circuited,
then the amplifier thermal sensing system may cause temporary shutdown of that particular channel. This is indicated by the illumination of
the front panel high temperature LED. Depending upon available cooling air, operation should be restored in that channel relatively quickly.
In any event, corrective action should be taken to determine the cause of the thermal shutdown. If the amplifier is not severely overloaded or
shorted and airflow is normal in and out of the amplifier, then steps should betaken to providea cooler environment for all the amplifiers. As a
general rule, the cooler electronic equipment is operated, the longer its useful service life. You have invested in the finest equipment that
money can buy, and a little care will insure long and reliable operation.
Portable Rack Mount Applications
Dueto the weight of the CS-1200, we highly recommend that additonal support be provided at the back panel of the amplifier whenever one
or more units are installed in a portable rack mount configuration. For this purpose, two />-20allen head bolts (19) have been provided at the
rear of the CS-1200. These bolts should be attached to a suitable bracketing arrangement to provide this additional support. Also, two guards
have been provided on the rear panel of the CS-1200 to protect connectors, PL cans, and provide a means for routing cables. CAUTION:
These are not handles and they should not be used to lift the unit.
Input Connections
All input connections are made at the rear panel. The two 'A" jacks marked Power Amp Input (15) are wired in parallel for ease of
connecting to each channel. The dual (parallel) jacks allow daisy-chaining to additional channels. If RCA-type pin jacks are required, a
suitable adaptor can be used Shielded cables must be used to minimize hum and noise pickup. The nominal input impedance is 20K ohms.
This impedance represents a bridging load totheassociated driving equipmentand is compatible with the load requirementsof most home
stereo devices. The CS-1200 has an input sensitivity of 1.4V RMS (+3 dBV) for rated output with the front panel sensitivity control set at full
clockwise, again allowing complete compatibility in home applications. This sensitivity rating increases as the control is turned counter¬
clockwise. The new sensitivity rating is indicated by the setting of the calibrated sensitivity control. It is generally wise to operate the
sensitivity control at its full clockwise setting. The sensitivity control is discussed in greater detail later in this manual.
Output Connections
Two types of output connectors are provided on the rear panel of the amplifier. Two standard V" phone jacks wired in parallel (17) and one
set of 5-way binding posts (18) are available from each channel. Due to the high currents at full output (greater than 13 amps RMS), it is
recommended that #16 AWG or larger wire size be used whenever possible. For extremely long runs (30' or greater), #14 AWG should be
used. Smaller wire sizes will waste power and yield less than optimum results at the speaker. It is suggested that in commercial and other
non-portable applications, the 5-way binding posts (18) be used instead of the VT phone jacks. The binding posts are industry standard and
mating banana plugs are available at most electronic distributors As with any electronic equipment, proper phase of the outputs is a
necessity. A little ti me spent correctly identifying the wi ring can save a lot of problems in the field. The CS-1200 has a continuous rating of 600
watts RMS into 4 ohms. Music power operation into 2 ohms should be considered normal and generally will not present any problems.
However, continuous operation under these conditions might cause thermal shutdown, depending upon cooling air temperature. Operating
into loads below 2 ohms, although safe because of electronic protection mechanisms, should be avoided.
OPERATION
The CS-1200 commercial series power amplifier is designed for maximum ease and flexibility of operation. When the unit is installed and
connected as described in the previous sections, operation is as simple as turning on the mains switch (5) and turning up the sensitivity
controls (1) to full clockwise setting, and then ad|usting the associated mixer or preamplification equipment to supply the necessary signal
levels to provide the desired output level or until the front panel DDT active LED indicator shows that theamplifier is compressing. Further
increases in signal levels beyond this point will not produce any significant increase in output and could cause distortion problems.

Peavey CS 1200 Specifications

General

Channels	2
Signal to Noise Ratio	> 100 dB
Input Impedance	20k ohms balanced, 10k ohms unbalanced
Weight	35 lbs
Dimensions	3.5" H x 19" W x 15.25" D