User manual ROTEL RB-880

[. . . ] Heed all warnings and safety information in these instructions and on the product itself. You must allow 10 cm or 4 inches of unobstructed clearance around the unit. Do not place the unit on a bed, sofa, rug, or similar surface that could block the ventilation openings. If the unit is placed in a bookcase or cabinet, there must be ventilation of the cabinet to allow proper cooling. [. . . ] Please contact your authorized Rotel dealer for answers to any questions you might have. in addition , all of us at Rotel welcome your questions and comments. Save the RB-951MkII shipping carton and all enclosed packing material for future use. Shipping or moving the RB-951MkII 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. Should you move your RB-951MkII to another country, it is possible to configure your amplifier for use on a different line voltage. Opening the enclosure of the RB-951MkII exposes you to dangerous voltages. Consult a qualified technician or the Rotel factory service department for information. A pair of screw terminals for connecting the wires carrying a +12 volt trigger signal to turn the amplifier on and off, such as might be used in an elaborate custom installation. To use this feature the adjacent slide switch must be placed to the left position (see previous section). The TRIGGER INPUT accepts any control signal (AC or DC) ranging from 3 volts to 30 volts. These allow you to adjust the gain of the amplifier to match other components in an elaborate system. The CH 1 level control changes the gain of the left channel; the CH 2 level control changes the right channel. For Stereo mode: Slide the switch to the right, use both input connectors, and connect one speaker to each pair of speaker connectors. For Bridged Mono mode: Slide the switch to the left, use only the CH1 INPUT connection, and connect only one speaker to the two outer speaker connectors. Two front panel LEDs (one for each channel) flash to indicate when the amplifier is "clipping" or being asked to deliver more output current than it is capable of delivering. However, sustained or frequent clipping is one of the most common causes of speaker damage and should be avoided. Should this occur, either reduce the overall gain of the system by turning down the master volume control on your preamp. Alternatively, you may wish to permanently reduce the gain of the amplifier using the front panel level controls (see previous section). The RB-951MkII provides standard conventional input connections -- unbalanced RCA type connections as found on nearly all audio equipment. In addition, there is a pair of SIGNAL OUTPUT LINK connections for passing the unchanged input signal on to another audio component. Bridged Mono mode: Serial bridged mode which more than doubles the amplifier power into a single speaker. [. . . ] The collars of the speaker connectors should be screwed in all the way (clockwise). 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. [. . . ]