User manual ROTEL RA-870

[. . . ] Heed all warnings and safety information in these instructions and on the product itself. You must allow a minimum 10 cm or 4 inches of unobstructed clearance around the unit. WARNING: The rear panel power cord connector is the mains power disconnect device. The apparatus must be located in an open area that allows access to the cord connector. [. . . ] Protection circuitry against fault conditions with front panel indicators. However, when installing the amplifier in a confined space or near other heat-generating components, additional cooling may be desirable. The optional RKBF-1 fan kit can be easily installed for additional forced air cooling. In addition to lowering operating temperatures, the optional fan kit improves the performance of the amplifier, especially when driving difficult loudspeaker loads. When using the fan cooling, select a location for the amplifier where the noise will not be intrusive. In addition to basic installation and operating instructions, it provides valuable information on various RA-870 system configurations as well as general information that will help you get optimum performance from your system. 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 RA-870 shipping carton and all enclosed packing material for future use. Shipping or moving the RA-870 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. The amplifier goes into standby mode if the +12 volt signal is not present. Turning the switch OFF cuts power to the amplifier, regardless of whether or not a trigger signal is present. The RA-870 provides standard conventional input connections -- unbalanced RCA type connections as found on nearly all audio equipment. There is also a pair of SIGNAL OUTPUT LINK connections for passing the input signal connected to the "A" pair of channels on to another audio component. Additionally, the input signal to the "A" pair of channels can be automatically linked to the inputs for the "B" and/or "C" channels, so that a separate input signal cable is not required for those channels, for example in large systems where the RA-870 is being used to drive multiple pairs of speakers. An input jack for connecting the wires carrying a +12 volt trigger signal from a Rotel preamp or surround sound processor to turn the amplifier on and off. 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. The 12V TRIG jack labeled OUT is used to pass the remote turn-on signal to a second Rotel amplifier. Any 12V Trigger signal at the INPUT jack will be passed through to the OUT jack. See Figure 2 There are two RCA inputs for each of the three pair of amplifier channels. [. . . ] 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. Your authorized Rotel dealer can help in the selection of appropriate cables for your system. [. . . ]