B&K ST260 - Manual (Page 13)

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Mono application (Medium current)
The ST260’s two output channels may be paralleled (mono) to combine the left and
right channels output current. This feature allows the amplifier to double its apparent
output current. To use, place the source group jumper for both channels on the ‘L BUS’
jumper terminal. Place the volume group jumper for both channels on the ‘NO VOL’
jumper terminal.
The speaker output terminals on the ST260’s rear panel must be paralleled in order to
complete the setup. Simply connect the (+) terminals for both channels together using
a jumper wire (not supplied with the amplifier). Finally, connect the speaker cables from
the left channels (+) and (-) terminals to the speakers. Input your source signal into the
left channel input. The instructions show the use of the left channel. You may also use
the right channel if you desire, just follow the above instructions using the right channel.
You may also use the L+R BUS to send a mono signal out of the amplifier derived from
the left and right channels. See below: