Rich, it makes no difference whether you use the A or B connection for the side surrounds; they receive exactly the same signals in both. The purpose of Denon having that(the manual made it real clear, didn't it?)is to possibly have two separate sets of side surround speakers, e.g. multipoles for movies, monopoles for music, and to select between the two for the appropriate source material.

On the internet radio stations, don't overlook, among others, BBC Radio 3.

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Enjoy the music, not the equipment.