4 Channel speaker level input into a 5 channel amp?

[jeffjgoug]

Hello fellow audio enthusiasts!

I have recently purchased a Picasso Nano 640.d amplifier for my Honda Accord sport 2019 with the 8 speaker sound system. It has a tablet style factory radio with I cannot replace. I will be using the ax-dsp-hon2 harness to pull speaker level signal from the head unit. It outputs 4 channels, and I was wondering if there was any way to duplicate the speaker level signal so I could have input for the 5th channel. The amp accepts high level inputs. There are also no input selector switches with this model of amplifier.

Thanks so much

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