Im not sure I agree that you need more power then the A70 in a 500- 700 sq feet room, my room is 643 sq feet and my A65 drivers my 4ohm 88db speakers to 90-95 db crystal clear and compresses the room just fine. Depending in the sensitivity of your speakers I think there are other factors beyond the A70 not being able to drive your speakers to your desired listening level.The A70 also has a 800 damping factor which is twice the amount my A65 has.
The P7300 I have no experience with.
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