User manual ROTEL RB-850

[. . . ] If the unit is exposed to moisture, or a foreign object gets into the enclosure, immediately disconnect the power cord from the wall. Take the unit to a qualified service person for inspection and necessary repairs. Read all the instructions before connecting or operating the unit. Keep this manual so you can refer to these safety instructions. [. . . ] 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. Then, plug the other end of the power cord to the power outlet. 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). The AC line configuration is noted on a decal on the back panel. Likewise, remember the weight of the amplifier when you select an installation location. Make sure that the shelf or cabinet can support its considerable bulk. Instead, the protection circuit monitors the temperature of the output devices and shuts down the amplifier if temperatures exceed safe limits. Most likely, you will never see this protection circuitry in action. However, should a faulty condition arise, the amplifier will stop playing and an LED indicator on the front panel will light up. If this happens, turn the amplifier off, let it cool down for several minutes, and attempt to identify and correct the problem that caused the protection circuitry to engage. When you turn the amplifier back on, the protection circuit will automatically reset and the indicator LED should go out. 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. [. . . ] there may be ribs or a stripe on the insulation of one conductor. The wire may have clear insulation with different color conductors (copper and silver). This input is typically only used in professionally-installed custom systems. the DB25 input duplicates the function of the five RCA inputs. [. . . ]