A certain Jim Lesurf, of uk.rec.audio "fame", writes :
As an experiment I tried adding two rear speakers but found that this
made only a marginal difference for classical music.

I was very pleasantly suprised by just how good some DVD videos of
classical items are. I was tempted at one point to wonder if this is due to
the 48kHz sampling rate as opposed to 44kHz for CD.

This is a pretty negligible difference. They're probably just well
produced.

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"Jokes mentioning ducks were considered particularly funny." - cnn.com