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  2. RCA Photophone - Wikipedia

    en.wikipedia.org/wiki/RCA_Photophone

    Whereas the Western Electric/Westrex recorders with the ca. 1938 4-ribbon light valve (RA-1231, e.g., but not RA-1231A) were inherently capable of producing time-aligned sound negatives. The Westrex system was renamed Photophone after the Western Electric and Westrex registered trademarks were sold by AT&T and Litton Industries, respectively ...

  3. Loudspeaker enclosure - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker_enclosure

    The response of closed-box loudspeaker systems has been extensively studied by Small [9] [10] and Benson, [11] amongst many others. Output falls below the system's resonance frequency (F c), defined as the frequency of peak impedance. In a closed-box loudspeaker, the air inside the box acts as a spring, returning the cone to the zero position ...

  4. Music Box Theatre (Chicago) - Wikipedia

    en.wikipedia.org/wiki/Music_Box_Theatre_(Chicago)

    Film presentation capabilities at The Music Box in the main theater are 16mm film, 35mm film (1.19:1, 1.33:1, 1.37:1, 1.66:1, 1.85:1 and Cinemascope aspect ratios), 70mm film, and digital projection. The sound systems are Laser optical, DTS, Dolby, Dolby Digital. Theater two has 35mm film and digital projection capabilities.

  5. Optical sound - Wikipedia

    en.wikipedia.org/wiki/Optical_sound

    For half a century, cinema sound systems were licensed to either RCA or Western Electric, and motion picture producers elected to license one or the other, or even both. This continued until 1976, by which time optical sound recording had been converted to the Western Electric (dubbed "Westrex") stereo variable-area system.

  6. Chicago's Music Box Theatre is spending $750K for new ... - AOL

    www.aol.com/chicagos-music-box-theatre-spending...

    New carpet, too; design to be determined (the staff is still assessing samples), but if the Music Box Theatre is essentially a period picture unto itself, the carpet, Oestreich says, needs to ...

  7. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. 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.

  9. AOL Mail for Verizon Customers - AOL Help

    help.aol.com/products/aol-mail-verizon

    AOL Mail welcomes Verizon customers to our safe and delightful email experience!