User manual PEAVEY CS 1000X

[. . . ] A A Intended 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. Refer servicing to qualified service personnel. [. . . ] Notice that the jumper plugs are inserted in the transformer (12) and crossover (14) accessory sockets of Island A. These jumper plugs cause the XLR connector of this island to be wired in the unbalanced configuration (as in Diagram 1) and complete the connection to the Channel A power amp input jacks (which are now the only active inputs). The Channel A sensitivity control now determines the sensitivity of the bridge-mode amplifier. The Channel B input jacks and sensitivity control serve no purpose in this mode, and are actually electronically removed from the circuit. Both sets of parallel l/4" output phone jacks are also not normally used in the bridge 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 potentially dangerous situation, especially if the individual channels are being used to supply high and low signals in a typical biamp configuration. Obviously, the speaker components on Channel B would no longer be supplied their intended signal but an out-of-phase version of the Channel A signal, which could easily destroy the TRANSFORMER i i. X-OVER SENSITIVITY CHANNEL B INPUTS AND SENSITIVITY CONTROL AREDEFEATED d BRIDGE 4Elc. &J+ ISTEREO CONNECT LOAD BETWEEN RED BINDING POSTS 7OV/l OOV LINE TRANSFORMER X-OVER 0 PATCH PANEL (BRIDGE MODE) WITH JUMPERS 12 associated loudspeaker components. To help prevent this, whenever the bridge mode is selected, the standby ("0") LED and the LED array itself on Channel B is defeated (off), just as if there was some kind of a fault condition present on Channel B. This provides a positive indication that the CS 1000X is no longer in the stereo mode. INPUT SENSITIVITY CONTROLS The input sensitivity rating of a power amplifier is the RMS voltage level required at the input to produce full-rated power into the rated load at the output. This voltage then becomes the level at which the associated mixer must operate in order to drive the amplifier to full output. The CS 1000X sensitivity controls are calibrated in decibel volt values rather than RMS voltage (usually listed in typical mixer specs), and as such are more useful, since most contemporary mixers employ LED arrays to indicate mixer output levels and are calibrated in decibel volts. Knowing the power amplifier sensitivity rating in decibel volts will allow the mixer operator to know the status of the power amplifier by noting which LED on the mixer is peaking. Obviously, the LED labeled the same or closest to the sensitivity rating of the power amplifier will indicate full power output of the system. Operation at levels above this rating will cause the power amplifier to clip (produce distortion) unless the associated amplifier has a compressor/limiter to minimize this distortion. Patent #4, 318, 053), is included in the CS 1000X, and the advantages should be obvious. Without DDT, the sound engineer must "ride gain" on the mixer or employ an outboard limiter in order to prevent amp clipping. With DDT the sound man can relax more and enjoy the "ride. " For maximum mixer headroom (which in turn really is maximum compression range), the input sensitivity control should be set at the maximum clockwise setting. This is always the best setting to start with. If, however, the amplifier 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. [. . . ] For more information on groundin, , write for our free hooklct "Shock HaLard and Grounding. " Power supply cords should always be handled carefully. Never walk or place equipment on power s~~pply cot&. Pet-iodically check cords for cuts or signs of stress. c~pecially at the plug and the point where the cord exits the unit. [. . . ]