User manual ROTEL RB-993

[. . . ] Pay particular attention to the power cord at the plug and where it exits the back of the unit. The power cord should be unplugged from the wall outlet if the unit is to be left unused for a long period of time. Immediately stop using the component and have it inspected and/or serviced by a qualified service agency if: · The unit has been dropped or damaged in any way. Please use Class 2 Wiring when connecting the speaker terminals of the unit to ensure proper insulation and minimize the risk of electrical shock. [. . . ] in addition , all of us at Rotel welcome your questions and comments. Shipping or moving the RB-993 in anything other than the original packing material may result in severe damage to your amplifier. It is your best record of the date of purchase, which you will need in the event warranty service is ever required. When used in a high-quality music or home theater system, your Rotel amplifier will provide years of musical enjoyment. Its digital amplifier circuitry, switching power supply, premium components, and Rotel's Balanced Design ensure superb sound quality. High current capability allows the RB-993 to drive difficult speaker loads with ease. The heat sinks and ventilation openings in the amplifier are designed to dissipate this heat. There should be 10 cm (4 inches) of clearance around the chassis, and reasonable airflow through the installation location, to prevent the amplifier from overheating. Likewise, remember the weight of the amplifier when you select an installation location. A heavy duty multi-tap power outlet strip may be used, but only if it is rated to handle the current demand of the RB-993. Your RB-993 will automatically configure itself for the proper AC line voltage rating, from 110 volts to 240 volts, at 50/60Hz. See Figure 2 The RB-993 has standard unbalanced RCA-type input connectors, the type used on nearly all audio equipment. These RCA inputs accept audio signals from preamplifiers or surround sound processors. The RB-993 has five sets of speaker connectors, one for each amplifier channel. The polarity ­ the positive/negative orientation of the connections ­ for every speaker and amplifier connection must be consistent so all the speakers will be in phase. if the polarity of one connection is mistakenly reversed , bass output will be very weak and stereo imaging degraded. The wire may have clear insulation with different color conductors (copper and silver). If you are attaching bare wires directly to the speaker connectors, separate the wire conductors and strip back the insulation from the end of each conductor. Place the connector lug around the shaft, or insert the bundled wire into the hole in the shaft. turn the collars clockwise to clamp the connector lug or wire firmly in place. NOTE: Be sure there are no loose wire strands that could touch adjacent wires or connectors. See Figure 2 The RB-993 has two color coded terminals for each amplifier channel. [. . . ] Most difficulties in audio systems are the result of poor or wrong connections, or improper control settings. If you encounter problems, isolate the area of the difficulty, check the control settings, determine the cause of the fault and make the necessary changes. If you are unable to get sound from the RB-993, refer to the suggestions for the following conditions: Power Configuration Watts/Channel all channels driven, with 20kHz filter 8 ohm load, 20Hz to 20kHz, <0. 02% THD 4 ohm load, 1kHz, <1% THD Peak Output Current Total Harmonic Distortion At rated power, 20Hz-20kHz At one-half rated power, 20Hz-20kHz At 1 watt per channel, 20Hz-20kHz Intermodulation Distortion at rated power, 60Hz:7 kHz, 4:1 Damping Factor 8 ohms Amplifier Gain Input Sensitivity/Impedance Frequency Response ±3dB Signal to Noise Ratio IHF A network Power Requirements Power Consumption Idling Power Consumption Standby Power Consumption Dimensions (W x H x D) Front Panel Height (for rack mount) Weight (net) All specifications are accurate at the time of printing. [. . . ]