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: A series of sine waves (e.g., 100Hz, 1kHz, 10kHz, 20kHz) at 0 dB for measuring output voltage, distortion, and channel separation.
: Specialized for testing tracking ability and error concealment by intentionally pushing the laser's tracking limits. Where to Find It sony yeds18 test disc exclusive
Because of its rarity, prices for an original YEDS-18 can range significantly, with some listings on eBay or AliExpress reaching over . For those who only need the audio signals and not the physical reference disc, digital copies in FLAC format are sometimes hosted on platforms like the Internet Archive . However, experts warn that a digital copy burned to a standard CD-R cannot perform the same mechanical and optical calibration as the original factory-pressed glass-mastered disc. : A series of sine waves (e
: It is manufactured with extreme tolerances for flatness, eccentricity, and reflectivity to ensure it serves as a true "reference" for mechanical alignment. For those who only need the audio signals