Classe Audio CA-M400 Owner's Manual page 15

4 Mode button
The mode button is used (along with the select button) when con-
figuring the amplifier for either balanced or single-ended opera-
tion. It is also used when configuring the turn-on sequence of a
series of Classé amplifiers connected to a Classé preamplifier by the
CAN Bus communications or Trigger systems.
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