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2. GENERAL DESCRIPTION
TOA's D-901 is a 19-inch rack-mounted (3U high) digital mixer configured with 12 inputs, 8 buses, and 8
outputs. It features signal processing functions necessary for sound systems such as feedback suppression
and auto-mixing. All functional parameters can be set at the unit*. Settings can be stored in the unit's internal
memory as "preset memory" and can be recalled using the front panel-mounted operation keys.
* Can also be set at a PC using the setting software, which can be downloaded from our website
"http://www.toa-products.com/international/".
3. FEATURES
• Acoustic feedback can be suppressed through simple operation.
• Auto-Mixing functions (Ducker*
1
and NOM Attenuation*
2
) automatically adjust the input signal volume.
• Signals are digitally processed, ensuring high-accuracy sound parameter settings.
• All settings can be performed at the unit using the LCD screen and setting keys and knobs located on the
front panel. The settings can also be made at a PC using the dedicated software.
• Modular construction permits flexible configuration of inputs and outputs, from 2-IN/4-OUT to 12-IN/8-OUT
systems.
• Up to 16 preset patterns can be stored in memory, which can be easily recalled from either the unit or
connected external equipment.
• An RS-232C port permits remote control of the unit using an AMX or Crestron controller, or similar external
equipment. The control protocol is available for download at our website http://www.toa-
products.com/international/.
• A protect function prevents accidental changes of front panel key settings.
• The use of an optional D-981 or D-983 Remote Control Module, or an optional D-984VC VCA Control
Module permits easy remote operation of volume control and preset memory recall.
• The use of an optional D-984VC VCA Control Module permits the sound volume to be adjusted from remote
locations using the faders or volume controls.
*
1
Automatically adjusts all channel gains in response to input signal level. (Refer to p. 38.)
*
2
Automatically adjusts the input gain of open microphones corresponding to the number of open
microphones in the system. (Refer to p. 39.)
Notes
• AMX is a trademark of AMX Corporation.
• Crestron is a trademark of Crestron Electronics, Inc.
4. HANDLING PRECAUTIONS
• Warning: This is a class A product. In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.
• Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be required
to correct the interference at his own expense.
• Use the unit in locations where the temperature is between +5 to +40 °C (no condensation) and the humidity
is less than 90%.
• The D-901 is a precision audio component. To prevent failure, avoid locations where the unit may be
exposed to strong shocks or vibrations.
• Do not place combustible material under the unit.
• To clean, be sure to first switch off the power, then wipe with a dry cloth. When extremely dirty, use a soft
cloth dampened in neutral detergent. Never use benzene, thinner or chemically-treated towels, which may
damage the unit's finish.