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Toshiba AD-4

Automatic Dynamic Range Expansion System (1980-83)

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Toshiba AD-4


service manual   English - luckyx02

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re: AD-4

Possibly the best tapedeck noise reduction system and especially constructed for the low quality medium cassette. With built-in huge tolerance for missmatched playback level +/-2dB (!), decreased distortion to 1/6, 30dB additional S/N, ~100dB dynamic, ultra short rising time.

All other DNR has a proffesional background like "Dolby A" or "Telcom C-4" and are simply downgraded for the "cheap" Medium Cassette and are far away to be perfect for daily use.

If you are recording always the built-in calibration tone ahead of your recording like mentioned in the manual, you have the possibilty to use various decks with different level with it. In this way misstracking can be easily corrected even after years.

HighCom I and II leaving a big colouring of its own in the recording beside the cutted low range <40Hz. Not so adres. Extreme clean sound with depth, dynamical crispy highs and deep "punchy" bass. No smoothing over all like Dolby-S !

I am using it with my Revox B215S and it makes awesome recordings with cheapest cassettes.

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