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2. Bob Heil - Wikipedia

   en.wikipedia.org/wiki/Bob_Heil

   Bob Heil. Robert Gene Heil (October 5, 1940 – February 28, 2024) was an American sound and radio engineer who created the template for modern rock sound systems. He founded the company Heil Sound in 1966 [1] and built touring sound systems for bands such as The Grateful Dead and The Who. [2] He was also a musician, and played the Wurlizter ...

3. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

4. Heil Sound - Wikipedia

   en.wikipedia.org/wiki/Heil_Sound

   Heil Sound Communications, Inc is an American manufacturer of professional audio equipment based in Fairview Heights, Illinois.The company was founded by Bob Heil in 1966, and is well known for inventions in live sound, the Heil Talk Box and a variety of high-quality microphones and headsets for use in commercial and amateur radio.

5. R. L. Drake Company - Wikipedia

   en.wikipedia.org/wiki/R._L._Drake_Company

   Website. www.rldrake.com. Drake TR-4, W-4, MS-4 circa 1971. The R. L. Drake Company is a manufacturer of electronic communications equipment located in Springboro, Ohio. It is also known for its line of equipment for amateur radio and shortwave listening, built in the 1950s through the 1980s. The company operates as a separate entity owned by ...

6. Realistic (brand) - Wikipedia

   en.wikipedia.org/wiki/Realistic_(brand)

   1969. Defunct. 2000 (Returned in 2016) Fate. Renamed Radio Shack brands. Products. Record players, Audio receivers, Cassette decks, Ham radios, Speakers, Headphones. Realistic is a brand produced by RadioShack, a division of Tandy Corporation, to market audio and video products for home use. The brand name was phased out in the mid 1990s and ...

7. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   Active noise control. In active noise control, a microphone is used to pick up the sound that is then analyzed by a computer; then, sound waves with opposite polarity (180° phase at all frequencies) are output through a speaker, causing destructive interference and canceling much of the noise. Applications Residential