Chucky, It's too bad that the tests weren't done with a properly functioning and adjusted QSD-1. However I know that the Involve produces higher separation values in any case. As you said music does not consist of simultaneous continuous tones, which is in part is why I prefer single band decoding. By my logic If a channel or track is supposed to be in one location but due to tri-band processing it's split by frequency between several output channels, the sound image will be smeared. I've heard this happen with the QSD-1. Also I reason that if more frequency bands are employed any shifting or smearing should be more gradual, thus less noticeable. I often think of attempts to create stereo from mono by feeding the bass to one speaker and the treble to another, not the best method.
