Gary, another welcome. Since when attending a concert the sound doesn't come to us only as direct sound from the front, but at least equally as reflections from other angles, "purity" calls for trying to more nearly duplicate that at home. When playing multi-channel source materials such as most SACDs, they should certainly be listened to in surround. When listening to CDs or other 2-channel material they should also be listened to in surround by applying DPLII or a similar mode which extracts the surround ambience which had to be mixed into the front channels(there was no place else to put it)and steers it to the surrounds where it belongs. This brings listening realism a little closer.
