User manual RUSSOUND R1250MC

[. . . ] Do not touch the amplifier with wet hands. Do not handle the amplifier or power cord when your hands are wet or damp. If water or any other liquid enters the amplifier cabinet, take the amplifier to qualified service personnel for inspection. Cleaning - The appliance should be cleaned only as recommended by the manufacturer. [. . . ] All other servicing should be referred to qualified service personnel. 20. Damage Requiring Service - The appliance should be serviced by qualified service personnel when: A. The power - supply cord or the plug has been damaged; or B. Objects have fallen, or liquid has been spilled into the appliance; or C. The appliance has been exposed to rain; or D. The appliance does not appear to operate normally; or E. The appliance has been dropped or the enclosure is damaged. 2 R1250MC AMPLIFIER INTRODUCTION The Russound R1250MC is a 12-channel power amplifier and is ideal for use as the main amplifier in home theater and distributed audio systems. The 12 channels are arranged in pairs to provide amplification for six stereo zones. The R1250MC provides an array of useful features such as bridge mode operation, independent zone triggering, bus inputs and multiple speaker outputs per zone to meet a wide variety of applications and configurations. The R1250MC is rated at 50 watts per channel into 8 ohms and 80 watts per channel into 4 ohms. With the Stereo/Bridge Mono switch in the Bridge mode position, both channels in the zone are combined fora higher powered mono output. In bridged mode, the R1250MC provides 140 watts of power into a single 8-ohm load. All this power is backed by three high output toroidal transformers. Each amplifier output channel incorporates robust protection circuitry for safety and reliability under extreme circumstances. FRONT PANEL 1 R USSOUND R1250MC POWER AMPLIFIER 1 Zone Indicator LEDs: The six LEDs correspond to the six stereo zone amplifiers. The LED will illuminate red when the amplifier power is on and the zone is in standby. The LED will illuminate green when the zone is active. RACK MOUNTING The R1250MC amplifier can be rack mounted using the included rack-mount ears and hardware to attach the ears to the amplifier. The amplifier will take 3 rack spaces with the feet removed. R1250MC Side View Rack Ear Screw Holes + + Rack Ear Front View Rack Ear Side View 3 R1250MC AMPLIFIER 1 2 3 4 5 1 6 7 11 10 4 9 8 1 Bus Input/Output: The bus line input is an optional input that can be used to connect a single source to multiple zones. The bus line output is a passive passthrough of the bus input and can be used to daisy chain the source to other amplifiers in the system. Line Input: The line audio input for each zone is a dedicated sensing input that will activate the zone when an audio signal from a source is present. Line/Bus Switch: Sets the zone input to the Line audio input or the Bus input. Speaker Outputs: The A and B speaker outputs are in parallel to the amplifier output. The minimum speaker impedance for stereo mode operation is 4 ohms for one pair and 8 ohms for two pairs of speakers. [. . . ] If this fault occurs, turn off the amplifier, and check that the speaker impedance rating is above the minimum rating. Also check for adequate ventilation around the amplifier and make adjustments if necessary. Once the unit has cooled to safe operating temperatures, the amplifier may be powered back on. PROTECTION CIRCUITRY All Russound amplifiers are designed with special circuitry to safeguard the amplifier under a short-circuit condition. A faulty speaker can also cause a short circuit condition. [. . . ]