| 41. | A Quadraphonic mix was available on both vinyl and Quadraphonic 8-track tape formats.
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| 42. | He was the inventor of the QSI system that sparked up interest in quadraphonic broadcasting.
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| 43. | The album was a standard recording but available in two formats : quadraphonic and stereo.
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| 44. | Two decades ago, the recording industry brought forth a flashy surround technology dubbed quadraphonic sound.
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| 45. | A Quadraphonic mix of the album was available in the Quadraphonic 8-Track cartridge format.
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| 46. | A Quadraphonic mix of the album was available in the Quadraphonic 8-Track cartridge format.
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| 47. | A Quadraphonic mix of the album was available on the Quadraphonic 8-Track cartridge format.
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| 48. | A Quadraphonic mix of the album was available on the Quadraphonic 8-Track cartridge format.
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| 49. | A 8-track cartridge formats, and is considered one of the rarest quadraphonic releases.
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| 50. | Pfeiffer helped RCA develop stereo and quadraphonic recording techniques and coordinate their adoption of digital recording.
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