User manual AUSTRALIAN MONITOR AM2200 BROCHURE

[. . . ] If the unit is used in an extremely dusty or smoky environment, the unit should be periodically "blown free" of foreign matter. 2. Read all documentation before operating your equipment. 4. Follow all instructions printed on unit chassis for proper operation. Removing the cover will expose you Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. Do not drive the inputs with a signal level greater than that required to drive equipment to full output. [. . . ] Fuse: When you receive your amplifier it will have a working fuse and a spare fuse inside the fuse drawer. The drawer can only be opened once the mains lead is removed from the connector. The fuse is provided to protect both the mains and your amplifier as well as reduce the degree of damage if an internal fault exists. When replacing the fuse, replace with an anti-surge (slow blow) type of the current rating indicated on the back panel above the fuse holder. Warranty does not cover a blown fuse or any resulting damage due to the use of an incorrect fuse rating or type. Breaker: If the circuit breaker trips, allow 3 mins for the contacts to reset thermally before pushing the reset button to reset it mechanically. 14 Limiter Switch Pushing this switch in engages the clip limiter circuitry. The threshold level is referenced to the supply rail and the output voltage is sampled allowing true clip detection and limiting. 10 Binding Post Outputs Touch proof binding posts (banana jacks) are provided for speaker output termination with banana plugs or bare wire. The red post is used as positive and the black post is used as negative. For bridge connection, use only the red posts. 10a Speaker Output Connector A 4 pole speaker connector is provided as an additional speaker output. This standard of loudspeaker-to-amplifier connection allows access to both channels of the amplifier via the one connector for bi-amp applications. Channel-A is considered the dominant channel and has both channels wired to the speaker connector. Earth loops can arise from the interfacing of the various pieces of equipment and their connections to various safety earths. This is by far the most common cause of hum, and it occurs when source equipment and the amplifier are plugged into different points along the safety earth where the safety earth wiring has a current flowing through it. The current flowing through the wire produces a voltage drop due to the wire's resistance. This voltage difference between the amp earth and source equipment earth appears to the amplifier's input as a signal and is amplified as hum. There are three things you can do to avoid earth loop problems: Ensure the mains power for the audio system is "quiet" i. e. without equipment on it such as air-conditioning, refrigeration or lighting which may generate noise in the earth circuit. Ensure all equipment within the system shares a common ground/ safety earth point. This will reduce the possibility of circulating earth currents, as the equipment will be referenced to the same ground potential. Ensure that balanced signal leads connecting to the amplifier are connected to earth at one end only. Signal Ground-Lift Switch When proper system hook-up has been made, you may still have some hum or hum related noise. Your Synergy-2 Series amplifier has a "Signal Ground Lift" switch which disconnects the input ground wiring from the amplifier. A substantial drop in hum and/or hum related noise can result from the judicious use of this switch. [. . . ] We recommend turning the attenuators on your amplifier down when turning the unit on. When you power up your Synergy-2 Series, your amplifier goes through an initialising period before it will accept signal. The Inrush Current Suppression (ICS) circuit is in operation for the first 0. 5 seconds. This limits the mains current, to prevent "nuisance-tripping" of circuit breakers. [. . . ]