Yamaha XM4220 Owner's Manual - Page 6

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. 8Ω In Bridge mode, you can connect multiple highimpedance speakers (that are compatible with 70V line output) in parallel. The number of speakers you can connect is determined by the rated input of each speaker. For each channel, you can connect speakers as long as the speakers' total rated input does not exceed 150W (for XM6150) or 350W (for XM4220). -+ - + -+ Total rated input 150W or less (XM6150) 350W or less (XM4220) Note: Be sure to use speakers that support the 70V line-out voltage. 6