User manual SONY XM-SD12X

[. . . ] The PROTECTOR indicator lights up in red, and the unit will shut down. If this happens, turn off the connected equipment, take out the cassette tape or disc, and determine the cause of the malfunction. If the amplifier has overheated, wait until the unit cools down before use. [. . . ] This unit is designed for negative ground 12 V DC operation only. Do not connect any active speakers (with built-in amplifiers) to the speaker terminals of the unit. Doing so may damage the amplifier and active speakers. Avoid installing the unit in areas subject to: -- high temperatures such as from direct sunlight or hot air from the heater -- rain or moisture -- dust or dirt. If your car is parked in direct sunlight and there is a considerable rise in temperature inside the car, allow the unit to cool down before use. When installing the unit horizontally, be sure not to cover the fins with the floor carpet etc. If this unit is placed too close to the car audio unit or aerial, interference may occur. In this case, relocate the amplifier away from the car audio unit or aerial. If no power is being supplied to the car audio unit, check the connections. This power amplifier employs a protection circuit to protect the transistors and speakers if the amplifier malfunctions. Do not attempt to test the protection circuits by covering the heat sink or connecting improper loads. Do not use the unit on a weak battery as its optimum performance depends on a good power supply. For safety reasons, keep your car audio volume moderate so that you can still hear sounds outside your car. If you have any questions or problems concerning your unit that are not covered in this manual, please consult your nearest Sony dealer. Before making any connections, disconnect the ground terminal of the car battery to avoid short circuits. Be sure to use speakers with an adequate power rating. If you use small capacity speakers, they may be damaged. Do not connect the # terminal of the speaker system to the car chassis, and do not connect the # terminal of the right speaker with that of the left speaker. [. . . ] In such a circuit, there is going to be an increase in the current which by-passes the speaker with frequencies at around the crossover frequency. If audio signals continue to be fed into the crossover frequency area, it may cause the amplifier to become abnormally hot or the fuse will be blown. also if the speaker is disconnected , a seriesresonant circuit will be formed by the choke and the capacitor. [. . . ]