User manual PEAVEY ICS 4200

[. . . ] 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. CAUTION: To reduce the risk of electric shock, do not remove cover. WARNING: To prevent electrical shock or fire hazard, this apparatus should not be exposed to rain or moisture, and objects filled with liquids, such as vases, should not be placed on this apparatus. Before using this apparatus, read the operating guide for further warnings. [. . . ] Whether you buy or make them, use good-quality connections, input cables and speaker cables, along with good soldering technique, to ensure troublefree operation. most intermittent problems are caused by faulty cables. Consult the Wire Gauge Chart (below) to determine proper gauges for different load impedances and cable lengths. Remember that cable impedance robs amplifier power in two ways: power lost directly to resistance (I2R loss), and by raising the total load impedance. (1) Power Indicator The green LED indicates AC power is supplied to the unit, the power switch is on and the unit is functional with no faults. If the amplifier has a thermal fault condition, this LED will not illuminate. (3) Clip (SPSTM) Indicators Any time a channel is driven into hard, continuous clipping, the SPS circuit will automatically reduce the channel gain to a level just slightly into clipping, guarding the speakers against the damaging high power continuous square waves that may be produced. Situations that may activate the SPS circuit include uncontrolled feedback, oscillations, or an improper equipment setting or malfunction upstream from the amplifier. On the ICSTM 4200, normal program transients will not trigger SPS; only steady, excessive clipping will. The LEDs will illuminate red when SPS circuitry is active for each channel amplifier. (4) Input Level Controls These controls adjust the signal level to the power amplifier inputs. maximum input sensitivity is achieved at the fully clockwise setting. These controls are detented to allow the input sensitivity of the channels to be closely matched. If the switch shuts off during normal use, push it back to the ON position once. If it will not stay on, the amplifier needs servicing. Warning: The power switch does not break both sides of the line and under certain conditions, hazardous energy can be present when the switch is in the OFF position. (6) Cooling Air Vent The ICS 4200 is designed to operate under extreme conditions. Part of this design includes the air vents visible from the front of the unit. The mains cord should be connected to the amplifier before connecting to a suitable AC outlet. The mains cord supplied with the unit is heavy-duty, 3-conductor type with a conventional 120 VAC plug with ground pin. Never break off the ground pin on any equipment. If the outlet used does not have a ground pin, a suitable grounding adapter should be used and the third wire should be properly grounded. [. . . ] This mode allows each output of the channel pair to directly drive a 70 Volt constant-voltage audio distribution system. Use the Bridged Mode to deliver the power of both channels to a 140 Volt constant-voltage audio distribution system. Use of a 70 Volt matching transformer is possible with a 140 Volt system by connecting the tap that is rated for 1/4 power or less of desired 70 Volt tap. For example, a ceiling loudspeaker with a 70 Volt input tapped for 20 Watts is to be used with a 140 Volt constant-voltage system. [. . . ]