Are Sub 1 and Sub 2 out on the Concert AVR 7/9 and M9/5 independent?

Sub 1 and Sub 2 output on our AVR’s and pre processors are not independent. They are fed by the same sub channel.

You can designate which pre output the AVR/pre processor outputs the sub channel via the Speaker Types tab on the On Screen Display:

The options are Present-1, Present-2 or none. When Present-1 is selected, the AVR will activate the Sub 1 output, if Present-2 is selected, it will activate both Sub 1 and 2.

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