Yamaha XM4220 Owner's Manual - Page 4

Controls and Functions s Front Panel 1 34 2 * The illustration shows model XM6150. 1 POWER switch and indicator This is the main POWER switch. Press to turn on the amplifier. Press it again to turn off. The POWER indicator lights up when the amplifier it turned on. 2 PROTECTION indicator When the protection system is active, the PROTECTION indicator lights up and the speakers are automatically disconnected from the amplifier's outputs. The protection system activates in the following situations: • When the amplifier is turned on The protection system activates for approximately three seconds when the amplifier is turned on. After three seconds, the protection system deactivates automatically and the amplifier is ready for normal operation. • If a DC voltage is detected at the amplifier's outputs The protection system activates if a DC voltage is detected at the amplifier's outputs. Once the DC voltage problem is corrected, the protection system deactivates automatically and the amplifier is ready for normal operation. • If the amplifier overheats If the amplifier overheats, the protection system activates. In this case, you should turn off the amplifier and allow it time to cool down. When it has cooled down, the protection system deactivates automatically and the amplifier can be turned on again ready for normal operation. See the Precautions section of this Owner's Manual for ways to prevent the amplifier overheating. 3 CLIP indicator A channel's CLIP indicator lights up when its output distortion exceeds 1% (i.e., clipping). Output signal clipping is typically caused by excessive input signal levels. 4 SIGNAL indicator A channel's SIGNAL indicator lights up when its output exceeds 2 V rms, which is equivalent to 1/2 watt into 8 ohms, or 1 watt into 4 ohms. 4