Lase, assuming that I'm listening on a setup with surround speakers, I always use a mode such as DPLII, Neural Surround or Neo:6 to extract the natural ambience present to varying degrees in 2-channel material and send it to the surround speakers where it belongs. In the concert hall the majority of sound reaches us not as direct sound from the front but as reflected ambience from other directions. Hearing that from surround rather than front speakers makes the listening experience a little more realistic.
