Update: I finally got a chance to use all 7 speakers, via y adapters, of the 5.1 analog outputs of the 2910. I listened to the Steely Dan SACD (Goucha). All I can say is that I was in musical bliss hearing the background singers, keyboards engulfing me from the side and rear surrounds while the lead singer came at me from the front. I have not done any technical measurings other than with my ears and I love the sound.