DVD Video Test Disc DVD Audio Test Disc DVD-ROM Test Disc DVD-Video Special Test Disc DVD-RW Test Disc Prerecorded DVD-RW Test Disc Prerecorded DVD-R Test Disc CD Test Disc CD-R/RW Test Disc Digital Video Test Tape Analog Video Test Tape Audio Cassette Test Tape Azimuth Speed & Flutter Level & Distortin Dolby Level Frequency-1 (Spot) Frequency-2 (Spot) Frequency-3 (Mix) Crosstalk Others Contact us Japanese   Audio Cassette Test Tape These test tapes are used for audio cassette player calibration and confirmation of operation on the production line. * Dolby is registered trademark of Dolby Laboratories Licensing Corporation.