An echo is a reflection of a sound that takes longer to arrive at the listener than the direct arrival of the sound from the source. This effect can also be emulated mechanically or digitally.

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creating a simple instrument tuned to a specific frequency

I would like to create a very simple percussion instrument that would match the resonant frequency of an echo-y cave I occasionally visit. Currently I am thinking of using a metal bar, but I don't ...
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How can I reduce the echo/reverb in a large room if I can't add physical damping?

I was at an event this evening in a restored ballroom - absolutely beautiful, but parquet flooring, high ceilings, solid walls etc all made for terrible acoustics, and in fact I could hardly make out ...