thomann Harley Benton BA250H, User Manual

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20 TUNER OUT
¼-inch (6.35-mm) monaural jack socket for a tuner.
21 FOOTSWITCH
¼-inch (6.35-mm) stereo jack to connect an optional double footswitch for the "MUTE" and "COLOR" functions.
22 LINE OUT
Male XLR panel connector as signal output for direct connection with a mixer, other power amplifiers or a recording device.
GND LIFT
If a ground loop causes hum, use this switch to disconnect the ground line of LINE OUT.
23 Fan
The fan speed varies according to the chassis inside temperature. Do not block the fan.
24 SPEAKER OUT
Loudspeaker output, the signal is available in parallel on both a ¼-inch (6.35-mm) monaural jack and a lockable speakON
panel jack.
Components and functions
bass head
20