A A lntended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. CAUTION: Risk of electrical shock - DO NOT OPEN! CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside.
A WARNING! For optimum performance and reliability DO NOT PRESENT THE AMPLIFIER WITH A SPEAKER LOAD OF LESS THAN 2 OHMS, OR A COMBINATION OF SPEAKERS THAT TOGETHER ARE LESS THAN 2 OHMS! Using one speaker, it must be rated at 2 ohms minimum. Using two speakers, they must be rated each at 4 ohms minimum. Using three speakers, they must be rated each at 8 ohms minimum. The world-famous CS@ 1200 power amplifier has been changed to the new, extended-performance CS@ 1200X.
CS” 12ooz PROFESSIONAL POWER AMPLIFIER CHANNEL 0 CHANNEL A lN!wT -SEN!3TlVITY STEREO MADE IN U.S.A. INPUT SENSITIVITY DDTTM ACTIVE LEDs (1) The DDTTM active LEDs indicate when compression is taking place. As long as gain reduction is occurring, the LED will continue to light, thereby giving a valuable indication of this unique compression function.
that particular channel. Operation at power output levels below 100% will naturally be indicated by lower LED readings. The lowest value indicated is 0.4% of full power, which corresponds to 2.0 watts RMS output into 4 ohms. Operation below that power level will not be indicated, since the lowest LED is calibrated at 0% or standby. As mentioned, this LED should be illuminated whenever the amplifier is operating with AC mains power applied under zero signal conditions.
GRILLE (6) The back panel includes the fan opening with protective grille (6), where cooling air is drawn into the amplifier. This opening should never be blocked or restricted. DDT SWITCH (7) This switch is used to either ENABLE or DEFEAT the DDT compressor. Defeating the DDT compressor should not be performed lightly or simply as a matter of course.
MODE SWITCH (10) The mode switch is located on the “back-porch” next to the channel input jacks. This switch converts the CS 1200X from normal stereo mode to bridge mode. Bridge-mode operation is very popular for commercial sound distribution systems (70/l 00 volt lines). A WARNING: In bridge mode, the CS 1200X is capable of delivering 1200 W RMS into 8 ohms and 1800 W RMS into 4 ohms. Always be very certain that the associated loudspeaker system can handle this power level reliably.
amp channel or at the input of the PL-MODULE ELECTRONIC CROSSOVER when BIAMPING, the (PL-2) transformer must be inserted here. Otherwise a blank plug (PL- 1) is inserted in this socket. CROSSOVER INPUTS (13) These are the HIGH-Z INPUTS when an ELECTRONIC CROSSOVER module is installed. Two parallel input jacks are provided at this point, allowing flexible Y-cord capability.
per channel or 4 ohms BRIDGE mode for any application. Operation at loads of 4 ohms per channel or 8 ohms BRIDGE mode is more desirable for sustained operation applications, because the amplifier will run much cooler at this load. Operation above 4 ohms per channel and even open-circuit conditions can always be considered safe; however, sustained operation at loads below 2 ohms could result in temporary amp shutdown due to operation of the thermal limiting and/or the fault detection circuitry.
OPERATION The CS 1200X is designed for maximum ease and flexibility of operation.
2. STEREO MODE (BALANCED INPUTS) When conditions require the use of a balanced input at the power amplifier, the XLR connectors (11) on either or both channels can be converted to a balanced configuration by removing the jumper plug from the transformer accessory socket (12) and plugging in an input transformer module (PL-2). The Peavey model PL-2 transformer module is a nominal 1: 1 turn-ratio type, resulting in unity gain.
isolated (no longer connected to anything). In other words, the crossover modules and all associated connectors (as well as the PL-2 transformers and respective XLR connectors) are islands unto themselves: in this case, two islands with each crossover having a balanced input (1 l), dual (parallel) unbalanced inputs (13), an unbalanced low output (15), and an unbalanced high output (16).
mode. Remember, the 4-ohm minimum load must be connected between the red binding posts. If individual loads were connected to each output (as in normal stereo applications) when the bridge mode is selected. Channel A would supply a normal in-phase signal to its respective load, but Channel B would supply an abnormal out-of-phase signal to its respective load, and both of these signals would contain Channel A source material (Channel B source material, if present, would be defeated).
turn really is maximum compression range), the input sensitivity control should be set at Ihe maximum clockwise setting. This is always the best setting to start with. If, however, the amptifier is used in a small club, church, or studio application where the full-output capability of the power amplifier is seldom needed, or there is no need for large amounts of headroom capability, the full-clockwise setting may not be the wisest choice. Then too, such applications often require low system noise.
normal intermittent applications, low-speed fan operation will provide adequate cooling. Since the CS 1200X is a redundant two-channel amplifier, but only one fan is employed, the fan circuitry is an independent system, separately fused internally. You will notice that the heat sink components are divided horizontally. The lower half contains Channel A output transistors, while the upper half belongs to Channel B. The fan provides equal cooling for both channels.
The result usually is severe clipping (distortion) of the high-frequency material. In a biamplified system, the high-frequency material is routed to its own power amplifier (and associated loudspeaker), which avoids the clipping problem. This results in an effective increase in system headroom that is greater than that which is obtained by simply using a second power amplifier/ speaker combination in full-range operation.
, 5. 6. ule. In this case, the associated XLR connector (11) is now unbalanced as per previous discussion. If desired, the parallel unbalanced phone jack inputs (13) may be used to supply signal to the crossover module.
SPECIFICATIONS Characteristics: (@ 120 V AC, 60 Hz) Output Power: (Typical Value) Stereo mode, both channels driven 2 ohms, 1 kHz, 1% THD 4 ohms, 1 kHz, 1% THD 8 ohms, 1 kHz, 1% THD Bridge mode, mono 4 ohms, 1 kHz, 1% THD 8 ohms, 1 kHz, 1% THD 900 W RMS per channel 630 W RMS per channel 390 W RMS per channel 1800 W RMS 1260 W RMS Rated Output Power: Stereo mode, both channels driven 4 ohms, 20 Hz to 20 kHz, 0.03% THD 8 ohms, 20 Hz to 20 kHz, 0.
k’requency Response: (Typical Value) Stereo mode, both channels driven +O, -1 dB, 1 W RMS, 4 ohms +O, -0.
CS42OOX PATCH DIAGRAMS Channel A Speakers Channel A Speakers Stereo Mode Channel A (Shielded) To Low -requency Speakers Channel B (ShIelded) To H,gh -requency Speakers PATCH DIAGRAM 1 Stereo Operation Unbalanced High Z Inputs (Typical Home Stereo) (Balanced Mono Stgnal from MIX Jumper Plugs Shlelded Patch Cord for High Pass PATCH DIAGRAM 5 Biamp Operation Balanced Low Z Input (Monaural Signal) Channel A pL-2 (Balanced) Channel A Channei A ShIelded Patch Cord for Low Pass Crossover Module Stere
THIS LIMITED WARRANTY VALID ONLY WHEN PURCHASED AND REGISTERED IN THE UNITED STATES OR CANADA. ALL EXPORTED PRODUCTS ARE SUBJECT TO WARRANTY AND SERVICES TO BE SPECIFIED AND PROVIDED BY THE AUTHORIZED DISTRIBUTOR FOR EACH COUNTRY. Ces clauses de garantie ne sont vaiables qu’aux Etats-Unis et au Canada. Dans tour les autres pays, les clauses de garantie et de maintenance sont fixees par le distributeur national et assuree par Iul seion la legislation envigueur.
IMPORTANT SAFETY INSTRUCTIONS WARNING: When using electric products, basic cautions should always be followed, including the following. 1. Read all safety and operating instructions before using this product. 2. All safety and operating instructions should be retained for future reference. 3. Obey all cautions in the operating instructions and on the back of the unit. 4. All operating instructions should be followed. 5. This product should not be used near water, i.e.
