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The DTR-90 is a 4-head professional R-DAT (Digital Audio Tape) recorder which conforms to the basic format established by the EIAJ/DAT Conference.

The DTR-90 utilizes two digital audio channels and one sub code channel which is used for time code recording/reproducing (with Time Code option, or DTR-90T).

Furthermore, with the optional GB-I49 R-DAT Editor, two DTR-90s (with Memory Start and Edit Memory options) can be used for edit operations.

Original suggested retail price of the DTR-90T was 10,000 US Dollars

• R-DAT Standard Format: The DTR-90 conforms to the basic format established by the EIANDAT Conference and offers complete electrical and tape compatibility with other R-DAT machines Including consumer R-DAT machines.
• Five Sampling Frequencies: Recording is possible at 32 kHz, 44.056 kHz (for Laser Disc post-production), 44.1 kHz, 47.952 kHz (for HDTV post-production), and 48 kHz.
• After Monitoring (Read After Write): As the DTR-90 utilises a 4-Head mechanism, a signal recorded in Assemble mode can be monitored by the reproducing head.
• Punch-In/Out Recording: Punch-in/out recording for each audio channel can be performed using the 4-head mechanism.
• Pitch Control: The pitch control range is ±12.5% (one wholetone) for each sampling frequency mode and can be displayed in Percent/Semitone.
• Time Code Synchronization (optional): When the ZA-42E-S Time Code option is installed in the DTR-90 (or when using the DTR-90T), the sub code area of the tape can be utilized for time code recording/reproducing. The DTR-90 can then be operated in synchronization with other equipment such as VTRs.
• Adjustable Crossfade Time and Two Crossfade Curves: Punch-in and punch-out crossfade time can be adjusted from 5 to 1,500 milliseconds. In addition to a "linear" crossfade, a "logarithmic" crossfade curve has been provided for more natural transition when recording music programs.
• Memory Start Function (optional): When the Memory Start option (PB-4VLAS) is installed in the DTR-90, audio signals to be played next can be read into the memory to shorten the start-up time. When playing, first the audio signal from the memory is played and then the signals from the tape will be played.
• Spot Erase Function (optional): When the Memory Start option (PB-4VLAS) is installed in the DTR-90, audio signals to be edited can be read into memory, then the spot erase operation can be rehearsed from the memory.
• Shuttle/Memory Jog Function: "Shuttle" is provided as a standard function. "Memory Jog" can be operated when the Memory Start option is installed in the |DTR-90.
• Removable Control Panel: The control panel can be detached from the DTR-90 and can be used as a remote controller.
• NOTE: When using the optional Remote Adapter (CB-508-S), the cable of the control panel can be extended.
• Status/Condition Indicators: The status/condition Indicators display the status/condition of the various DTR-90 functions in an easy-to-understand format.
• Bar Graph Peak Meters: The 30-LED bar graph peak meters feature Peak Hold and Auto Reset function. There is an overload indicator for each channel for optimum level setting. Also, the peak meters can be operated in Expand mode for more precise level setting.
• Active Balanced Input/Output: The active balanced input and output circuitry has been proven in a wide range of other Otari products.
• Selectable Digital Interface: The DTR-90 is equipped with a digital interface unit which contains a 2 channel TYPE I (AES/EBU) and TYPE II (SPDIF) digital interface.
• Otari Standard Parallel I/O: The DTR-90 has an Otari standard parallel I/O port, and also an RS-422 serial I/0 port and a broadcast parallel I/0 port The RS-422 interface is changeable to an RS-232C interface unit (ZA-96Y-S).
• CB-149 Optional R-DAT Editor (optional): By using the CB-149 R-DAT Editor, two DTR-90s can be used for digital sound editing.
• Video Editor Support: The DTR-90 can be controlled from external controllers such as video editors connected to the RS-422 serial I/O.