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  2. Reel-to-reel audio tape recording - Wikipedia

    en.wikipedia.org/wiki/Reel-to-reel_audio_tape...

    7-inch reel of 14-inch-wide (6.4 mm) recording tape, typical of non-professional use in the 1950s–70s. Studios generally used 10 1 ⁄ 2 inch reels on PET film backings. Inexpensive reel-to-reel tape recorders were widely used for voice recording in the home and in schools, along with dedicated models expressly made for business dictation.

  3. High fidelity - Wikipedia

    en.wikipedia.org/wiki/High_fidelity

    High fidelity. Hi-fi speakers are a key component of quality audio reproduction. High fidelity (often shortened to Hi-Fi or HiFi) is the high-quality reproduction of sound. [1] It is popular with audiophiles and home audio enthusiasts. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency ...

  4. Rectilinear Research Corporation - Wikipedia

    en.wikipedia.org/wiki/Rectilinear_Research...

    Rectilinear Research Corporation was a manufacturer of loudspeakers. The company was formed around 1966 and its principal was Morris I. Wiener (alt. sp. "Weiner") of Plandome Manor, New York. [1] The first known main office location for the company (1966–68) was at 30 Main Street, Brooklyn, New York. [2] Some time around 1968, the company ...

  5. This compact soundbar is getting rave reviews from shoppers ...

    www.aol.com/lifestyle/this-compact-soundbar-is...

    What reviewers say 💬. See why more than 15,600 five-star shoppers swear by this deceptively small soundbar. Pros 👍. Fans love the sound quality, comparing it to going to the movies.

  6. Harry Pearson (audio critic) - Wikipedia

    en.wikipedia.org/wiki/Harry_Pearson_(audio_critic)

    The Absolute Sound. Harry Hall Pearson, Jr. (January 5, 1937 – November 4, 2014), known to his readers as HP, was an American journalist, audio reviewer, and publisher who founded The Absolute Sound magazine for high-end audio enthusiasts. Pearson is considered the most influential figure in the history of audiophile journalism. [1]

  7. 5.1 surround sound - Wikipedia

    en.wikipedia.org/wiki/5.1_surround_sound

    In addition, some DVDs have DTS tracks, with most being 5.1 channel mixes (a few releases, however, have 6.1 "matrixed" or even discrete 6.1 tracks). Blu-ray and digital cinema both have eight-channel capability which can be used to provide either 5.1 or 7.1 surround sound . 7.1 is an extension of 5.1 that uses four surround zones: two at the ...

  8. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    Sound level meter. An integrating-averaging Cirrus Research's Optimus sound level meter which complies with IEC 61672-1:2002. A sound level meter (also called sound pressure level meter (SPL)) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the ...

  9. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    In the second step, they were divided by 3. The final result, ⁠ 4 / 3 ⁠, is an irreducible fraction because 4 and 3 have no common factors other than 1. The original fraction could have also been reduced in a single step by using the greatest common divisor of 90 and 120, which is 30. As 120 ÷ 30 = 4, and 90 ÷ 30 = 3, one gets

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