User manual ROTEL RB-850

[. . . ] 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 unit and have it inspected and/or serviced by a qualified service agency if: · The unit shows signs of improper operation The unit has been dropped or damaged in any way Place the unit on a fixed, level surface strong enough to support its weight. A family whose passionate interest in music led them to manufacture high fidelity components of uncompromising quality founded Rotel over 30 years ago. Through the years that passion has remained undiminished and the family goal of providing exceptional value for audiophiles and music lovers, regardless of their budget, is shared by all Rotel employees. [. . . ] If in doubt about your speakers, ask your authorized Rotel dealer for advice. the RB-985 MKII is straightforward in its installation and operation. If you have experience with other stereo power amplifiers, you shouldn't find anything perplexing. Connect some high-quality RCA cables to your preamp or signal processor and the RB-985 MKII inputs, wire up your speakers, and enjoy. Because of its high power rating, the RB-985 MKII can draw considerable current. Therefore, it should be plugged directly into a 2pin polarized wall outlet. A heavy duty multi-tap power outlet strip may be used if it (and the wall outlet) is rated to handle the current demanded by the RB-985 MKII and all the other components connected to it. Be sure the power switch on the front panel of the RB-985 MKII is turned off (in the out position). Connect the supplied power cord to the power input receptacle on the back of the RB-985 MKII. Your RB-985 MKII is configured at the factory for the proper AC line voltage in the country where you purchased it (either 115 volts AC or 230 volts AC with a line frequency of either 50 Hz or 60 Hz). In addition to basic installation and operating instructions, it provides valuable information on system configuration, as well as general information that will help you get optimum performance from your system. In most cases, the protection circuitry activates because of a fault condition such as shorted speaker wires, or inadequate ventilation leading to an overheating condition. In very rare cases, highly reactive or extremely low impedance speaker loads could cause the protection circuit to engage. If the protection circuitry triggers repeatedly and you are unable to isolate and correct the faulty condition, contact your Rotel audio retailer for assistance in troubleshooting. We recommend using loudspeakers with a nominal impedance of 4 ohms or higher with the RB-985 MKII. You should exercise some caution in driving multiple pairs of speakers in parallel configuration, because the effective impedance the amplifier sees is cut in half. For example, when driving two pair of 8 ohm speakers, the amplifier sees a 4 ohm load. When driving multiple speakers in parallel, it is recommended that you select speakers with a nominal impedance of 8 ohms or higher. In practice, very few loudspeakers will present any problems for the RB-985 MKII. The size and quality of the wire can have an audible effect on the performance of the system. Standard speaker wire will work, but can result in lower output or diminished bass response, particularly over longer distances. For best performance, you may want to consider special high-quality speaker cables. [. . . ] The hexagonal thumbscrews of the binding posts should be screwed in all the way (clockwise). If you are attaching bare wires directly to the binding posts, separate the wire conductors and strip back the insulation from the end of each conductor. Note: Be sure there are no loose wire strands that could touch adjacent wires or connectors. Most difficulties in audio systems are the result of poor or wrong connections, or improper control settings. [. . . ]