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"Rec'd CD's yesterday and I have to let you know how pleased I am with the results! You've managed to take a rather worn, 24 year old cassette that was recorded on a cheap portable cassette recorder, and turn it into 2 highly listenable CD's. This was the only surviving tape of my father-in-law, and as such, meant the world to my wife and I. ..."

Acoustic resonance

An increase in sound intensity as reflected waves and direct waves combine in phase. May also be due to the natural vibration of air columns or solid bodies at a particular audio frequency.