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Looper's Delight
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At 08:55 PM 11/3/99 +0000, you wrote: >....2 I've not tried this one. It involves placing a full range speaker >behind the audience and wiring it up to the two live terminals on a >stereo amp.... Yeah, that's the setup Brian Eno described on the back of one of his albums (I've forgotten which). It does mess with the impedance, though, so be careful of your output transistors! The way it works is by phase cancellation; since the third speaker is connected to the positive terminals of the two stereo channels, any sound common to both channels (i.e. in or near the center of the stereo field) cancels itself out and does not come out of the third speaker. Sounds that are panned hard left or right do come out of the third speaker, sounds appearing at intermediate points in the stereo image show up at different relative volumes due to their particular phase relationship. The effect is that, instead of a clearly defineable third sound source, certain sounds appear to come from points along the triangle formed by the three speakers, thus widening the stereo image and causing the illusion that the stereo field curves back around the listener inside the triangle. It makes the listening environment seem bigger, especially for sounds that pan around. I had my stereo set up this way for most of the early '80's, although the effect is probably too subtle to be of much use in a live-performance situation, unless there's a very low level of ambient noise. It would probably work well on a quiet, ambient art gallery-type gig, but would be pointless in most clubs or bars. Tim