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a A A CAUTION: - DO NOT CAUTION: WARNING: de1 una y A PRECAUCION: - PRECAUCION: a ADVERTENCIA: o a o & B A B A ATTENTION: - ATTENTION: h aucune r&Parke B I l;~e h AVERTISSEMENT: h
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WARNING! A The world-famous 1200 power amplifier has been changed to the new, extended-perfor- mance This upgraded model provides impressive output power capability while still maintaining the current 4- and ratings, and meets rigid industry standards for power bandwidth, slew rate, and distortion specifications. The new extended specs are: 630 W RMS into 4 ohms / 900 W RMS into 2 ohms (per channel) 1260 W RMS into 8 ohms / 1800 W RMS into 4 ohms (bridged) compression with LED indicators an
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PROFESSIONAL STEREO POWER AMPLIFIER 0 A lN!wT -- DDTTM ACTIVE LEDs (1) The active 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. The DDT function can be defeated on both channels simultaneously by selecting the defeat position on the DDT compression switch (7) located on the back panel of the CS 1200X. When the compressor is defeated, the DDT acti
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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. To the right of each ladder
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GRILLE (6) The back panel includes the fan opening with protective grille 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. Most loudspeaker systems simply cannot handle the square wave power of the CS and defeating this valuable limit can eventually cause the speakers to
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MODE SWITCH (10) The mode switch is located on the “back-porch” next to the channel input jacks. This switch converts the CS from normal stereo mode to bridge mode. Bridge-mode operation is very popular for commercial sound distribution systems 00 volt lines). WARNING: In bridge mode, the CS 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 A can handle this power level reliably. Also, be advised that in m
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amp channel or at the input of the PL-MODULE ELECTRONIC CROSSOVER when 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. The output of the LOW-Z XLR input circuitry is always connected to these inputs, which allow the LOW-Z INPUT to be used as the ELECTRONIC CROSSOVER input if desired. These inputs can then be used as FULL-RANGE outp
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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, be- cause 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.
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The 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 (S), turning up the sensitivity controls (4) to the full clockwise setting, and then adjusting the associated mixer or pre-amplification equipment to supply the necessary signal levels to provide the desired output level or until the front panel active LED indicator shows that the amplifier is compre
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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. In Diagram 2, the XLR connector is now wired as a conventional bal- anc
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isolated (no longer connected to anything). In other words, the crossover modules and all associ- ated 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 dual (parallel) unbalanced inputs an unbalanced low output and an unbalanced high output (16). In order to complete the system, external patching must be accomplished between the low and high crossover outputs and th
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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). This is a po
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turn really is maximum compression range), the input sensitivity control should be set at maximum clockwise setting. This is always the best setting to start with. If, however, fier 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 capability, the full-clockwise setting may not be the wisest choice. Then too, such applications often require low system noise. In this case, it
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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. Each channel has separate built-
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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 loud- speaker), 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. To biamp, then, some type of active crossover is employed in the mixer f
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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. In addition, whenever the XLR connector on a particular crossover island is used (either balanced or unbalanced), the crossover input jacks (13) can be used to patch out full-range signals to other amplifier/speaker systems that are operating in full range or other biamped systems that r
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SPECIFICATIONS (@ 120 V AC, 60 Hz) Output Power: (Typical Value) Stereo mode, both channels driven 900 W RMS per channel 2 ohms, 1 1% THD 630 W RMS per channel 4 ohms, 1 1% THD 1% THD 390 W RMS per channel 8 ohms, 1 Bridge mode, mono 4 ohms, 1 1% THD 1800 W RMS 1% THD 1260 W RMS 8 ohms, 1 Rated Output Power: Stereo mode, both channels driven 600 W RMS per channel 4 ohms, 20 Hz to 20 0.03% THD 8 ohms, 20 Hz to 20 0.02% THD 350 W RMS per channel Power Bandwidth: (Typical Value) Stereo mode, bo
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Response: (Typical Value) Stereo mode, both channels driven -1 1 W RMS, 4 ohms 5 Hz to 50 -0.2 @ rated output, 4 ohms 20 Hz to 20 Damping Factor: (Typical Value) Stereo mode, both channels driven Greater than 200 4 ohms, 1 Hum & Noise: Stereo Mode, both channels driven 100 unweighted Below rated output power, 4 ohms Power Consumption: Stereo mode, both channels driven @ rated output power, 4 ohms 120VAC 2 speed fan Switchable with LED DDT Compression System: 21 Cooling System: 15A@ dB, k
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CS42OOX PATCH DIAGRAMS Channel A To Low Channel A Patch Cord for Low Pass Mono from Speakers Crossover Module Jumper Plugs Stereo Mode Channel A Channel B To Patch Cord for Pass Speakers PATCH DIAGRAM 1 PATCH DIAGRAM 5 Stereo Operation Biamp Operation Unbalanced High Z Inputs Balanced Low Z Input (Typical Home Stereo) (Monaural Signal) Channel A (Balanced) Channel A Stereo Mode Jumper Plugs il A Channel A Channel B Frequency Speakers PATCH DIAGRAM 2 Stereo Operation Balanced Low Z In
