Chesky Records put out a test CD that included a very interesting set of test signals that sound like short bursts of static. If the system is set up properly, and if walls or furniture, etc., do not interfere too much with the direct sound from the speaker, the signal appears to start in the speaker then climbs to almost directly overhead before it arches over and then descends into the other channel's speaker. Quite amazing.
This Chesky test Cd is one of the best of its kind around.
This Chesky test Cd is one of the best of its kind around.