User manual PEAVEY CS 900 REV 01-89

[. . . ] W A R N I N G : To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before using this appliance, read the operating guide for further warnings. propcisito de alertar al usuario de la presencia de "(voltaje) peligroso" que no tiene aislamiento dentro de la caja de1 product0 que puede tener una magnitud suficiente coma para constituir riesgo de A Este simbolo tiene el prop&it0 de alertar al usario de la presencia de instruccones importantes sobre la operacicin y mantenimiento en la literatura que viene con el producto. PRECAUCION: Riesgo de corrientazo - No abra. P R E C A U C I O N : Para disminuir el riesgo de corrientazo, no abra la cubierta. No hay piezas adentro yue el usario pueda reparar. [. . . ] 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 13 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 chan-nels 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 associated IOLKspeaker 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. TRANSFORMER CHANNEL B INPUTS AND SENSITIVITY CONTROL ARE DEFEATED CONNECT LOAD BETWEEN RED BINDING POSTS 7OVIlOOV LINE RANSFORMER X-OVER 0 PATCH PANEL (BRIDGE MODE) WITH JUMPERS INPUT SENSITIVITY CONTROLS The input sensitivity rating of a power amplifier is , he 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. Often studio engineers feel the need to defeat the DDT compressor, for fear it might color the sound in studio listening. The DDT compressor is only activated when clipping is imminent. LJntit this occurs, it's simply a passive friend. The only reason the dcfcat switch is there in the first place is to allow check-out technicians to evaluate the power amplifier at clipping. Valuable performance illformation, such as power- supply ripple and regulation, can only be assessed when an amplifier is allowed to clip. THERMAL SYSTEM The CS 900 has a unique thermal system that employs a tunnel-type heat sink design to provide maximum cooling for the 32 power transistors (16 for each channel). A single 100 CF;M fan mounted on the back panel of the unit provides an almost unrestricted airflow through Ihe tunnel to provide the lowest possible operating temperature for the power devices. This approach is so efficient that even continuous operation into 2 ohms will not cause a thermal shutdown unless the ambient air temperature is considerably higher than normal (above 40" C). Under 15 normal intermittent applications, low-speed fan operation will provide adequate cooling. Since the CS 900 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. [. . . ] It should not be placed flat against a wall or placed in a built-in enclosure that will impede the flow of cooling air. This product should not be placed near a source of heat such as a stove, radiator, or another heat producing amplifier. Connect only to a power supply of the type marked on the unit adjacent to the power supply cord. Never break off the ground pin on the power supply cord. [. . . ]