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"Christmas came a little late this year but sure was worth it. I had thought that I had lost this concert disc forever as my laser disc player gave up the ghost and I did not want to repair it. I had checked to see if this concert had been released on dvd but it had not and no plans to, a new vhs tape of it would have cost $100. I found CVC on ..."

Acoustic lens

An array of obstacles that refracts sound waves in the same way that an optical lens refracts light waves. The dimensions of these obstacles are small compared to the wavelengths of the sound being focused. Also, a device that produces convergence or divergence of moving sound waves. When used with a speaker enclosure, an acoustic lens widens the beam of the higher-frequency sound waves.