User manual SONY XM-754HX

[. . . ] The color will change from green to amber when the voltage going out to the Speaker terminal or the Pin Jack is too high . THERMAL lights up in green during normal operation. The color will change from green to amber when the temperature rises to an unsafe level. The color will return to green when the temperature returns to normal. [. . . ] Make sure to place the unit in a well ventilated location. The power connecting leads are installed too close to the RCA pin cords. The ground lead is not securely connected. AUDIO POWER SPECIFICATIONS POWER OUTPUT AND TOTAL HARMONIC DISTORTION 75 watts per channel minimum continuous average power into 4 ohms, both channels driven from 20 Hz to 20 kHz with no more than 0. OTL (output transformerless) circuit Pulse power supply Inputs RCA pin jacks High level input connector Outputs Speaker terminals Speaker impedance 1* ­ 8 (stereo) 2* ­ 8 (when used as a bridging amplifier) Maximum outputs (HI-CURRENT/HI-VOLTAGE) Four speakers: 90/170 W × 4 (at 4 ) Three speakers: 90 W × 2 + 250 W × 1 / 170 W × 2 + 400 W × 1 (at 4 ) Two speakers: 250/400 W × 2 (at 4 ) Rated outputs (HI-CURRENT/HI-VOLTAGE) (supply voltage at 14. 005 % or less (at 1kHz, 4 ) Input level adjustment range 0. Accessories Supplied accessories Mounting screws (4), Terminal cap (1) Optional accessories Connecting cord for power amplifier RC-46 Design and specifications are subject to change without notice. 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 active speakers. Avoid installing the unit where: -- it would be subject to high temperatures such as from direct sunlight or hot air from the heater -- it would be exposed to rain or moisture -- it would be subject to 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 radio, interference may occur. In this case, relocate the amplifier away from the car radio. If no power is being supplied to the cassette player or tuner, 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. [. . . ] Be sure to connect the remote control lead of the car audio to the remote terminal. When using a car audio without a remote output on the amplifier, connect the remote input terminal (REMOTE) to the accessory power supply. Use the power supply lead with a fuse attached (40 A). Place the fuse in the power supply lead as close as possible to the car battery. [. . . ]