User manual ROTEL RA-820

[. . . ] You must allow 10cm, 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 slots. If the unit is placed in a bookcase or cabinet, there must be sufficient clearance around the unit and ventilation of the cabinet to allow proper cooling. Keep the unit away from radiators, heat registers, stoves, or any other appliance that produces heat. [. . . ] 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. Remember the weight of the amplifier when you select an installation location. Make sure that the shelf or cabinet can support its considerable bulk. we recommend installing the RA-820 in furniture designed to house audio components. Such furniture is designed to reduce or suppress vibration which can adversely affect sound quality. Ask your authorized Rotel dealer for advice about component furniture and proper installation of audio components. Note: Should you move your RA-820 amplifier to another country, it is possible to reconfigure it for use on a different line voltage. Opening the enclosure of the RA-820 exposes you to dangerous voltages. Consult a qualified service person or the Rotel factory service department for information. If you are going to be away from home for an extended period of time such as a month-long vacation, it is a sensible precaution to unplug your amplifier (as well as other audio and video components) while you are away. One of the most common uses for these connectors is to incorporate a surround sound processor into the system. Typically the front channel outputs from the signal processor are connected to the "Main In" of the RA-820. The other outputs from the signal processor are connected to other power amplifiers and speakers. Some Rotel cassette decks can be operated by the RR-927 remote control that come with the RA-820. To use this feature connect a standard 8-pin DIN type cable between the Cassette Remote connector on the back of the RA-820 and the connector on the back of the cassette deck. Control signals from the RR-927 remote control are pick up by the Remote Sensor on the front of the RA985BX and passed to the cassette deck via the cable. These connectors, when used in conjunction with XantechTM brand Video LinkTM IR signal pick ups and repeaters (sold separately by custom system installers), enable the RA-820 to pick up IR remote control signals and distribute them to other components. The Speaker Selector 5 on the front panel controls which set(s) of speakers are operating. 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. If only one set of speakers will be played at any one time, the speakers may have an impedance as low as 4 ohms. If both the A and B sets of speakers will be operated at the same time the speaker should have an impedance of 8 ohms or more. [. . . ] To reprogram the RR-927 to operate a component other than those previously listed, simultaneously press the letter button and number for that component. These buttons duplicate the functions of the Volume Control on the front panel of the RA-820. Press the right button (>) to increase the volume level, press the left button (<) to decrease the volume level. See the instruction manual for your cassette recorder for more information. [. . . ]