While the Surround Master does a decent job it lacks a "proper" surround mode. Both myself and
Sonic Wiz have gone on about this many times. The decoder should have a purpose built Surround or Stereo Enhance mode. A fully adjustable effect is the most use full as you can tailor the result to suit.
The Composer has such an adjustable setting, fully clockwise the stereo image is stretched around the room; while fully counterclockwise the stereo image remains upfront with mainly ambiance in the rear. QS has surround and Hall modes which produce a very similar effect just not adjustable. And I repeat it is like listening to stereo through a magnifying glass. Intricacies that go mostly unnoticed in stereo playback become readily apparent. Results are often indistinguishable from discrete. I can't understand why many here insist on listening to plain old stereo via only two speakers,
blasphemy!