POWER AMPLIFIER XM6150 XM4220 Owner’s Manual E
Introduction Thank you for purchasing a Yamaha 6150, or 4220 XM Series Power Amplifier. The XM Series of power amplifiers was developed from Yamaha’s wealth of experience in building PA equipment and its tradition of careful attention to every detail of circuit design. These power amplifiers feature high power and superb quality together with superior reliability and stability, guaranteeing the highest possible audio performance.
Precautions Warnings Cautions • Do not allow water to enter this unit or allow the unit to become wet. Fire or electrical shock may result. • • Connect this unit’s power cord only to an AC outlet of the type stated in this Owner’s Manual or as marked on the unit. Failure to do so is a fire and electrical shock hazard. • Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a fire and electrical shock hazard.
Controls and Functions ■ Front Panel 1 3 4 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.
■ Rear Panel 1 2 3 5 8 6 80 4 7 * The illustration shows model XM6150. 1 HPF switches 4 Euroblock connectors These switches are used to turn on and off the HPF (High Pass Filter) for each channel. When set to ON, frequencies below 80 Hz are filtered using a 12 dB/ octave high pass filter. Turn this switch ON if 70V-line, high-impedance speakers are connected. In Bridge mode, only the HPF switch of the first channel in the pair is active, i.e.
7 GND terminals This is the grounding screw terminal. If hum or noise occurs, ground (earth) the unit via this jack, or try connecting it to the chassis of the mixer or preamp, etc. 8 Speaker outputs These 5-way binding posts are used to connector speakers. The following illustrations show how speakers should be connected for normal and Bridge mode operation. Normal mode Bridge mode – + Speaker min. 4Ω + – + – Speaker min. 4Ω Speaker min.
