The amps don't connect to each other, they are totally separated. Nevertheless, I've already tried to let the HX40 amp the sub and the HX20 the rear or front. It was always the same.
Anything about the De-Coupler paradoxon?
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---------------------------- MK1: 00314 (4GB) MK2a: 030103104 (30GB) Installed in a BMW 323ti