Picc, welcome. Despite what you said that you "feel", not using the so-called "Bi-amping" feature would lose nothing, since it has the same power capability as the regular setup and can't increase power which is limited by the one main power supply section in the receiver.

As to whether the 7.1 speaker setup would be of benefit, the primary factor would be whether you have enough room behind your listening position(say at least 4')for a good rear soundfield to form.

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Enjoy the music, not the equipment.