TOA D-901 US User Manual

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Digital Mixer

Perfect to take the important audio role in AV-based presentation systems,

the D-901 Digital Mixer features a compact,

modular design with a 12 in/ 8 out configuration for

a variety of source equipment, with automixing,

feedback suppression, equalization, 16 memory presets and

full remote control capability.

901

High-resolution sound quality and rem all-in-one modular digital mixer.

D-901

Ready for any requirement.

The new TOA D-901 Digital Mixer is a fully modular, cost-effective digital mixer featuring a 12-input, 8-bus, 8-output channel configuration (12 x 8 matrix) with easy operation that can be expanded as applications require.

All-in-one design.

The compact D-901 is just 3U-sized but incorporates several of the most important functions. These include a digital mixer, feedback suppression, auto mixing, parametric EQ, compression, delay and echo. Its remarkable operational scope allows it to do the work that conventionally requires several different pieces of equipment, providing a cost-effective solution that is perfect for any requirement.

Feedback suppressor.

This sophisticated and TOA proprietary function automatically processes feedback at certain frequencies through constant monitoring then automatically attenuates only the precise problematic frequencies, keeping the audio sounding natural.

Automatic mixing function.

The D-901's automatic mixing function adjusts input level automatically to make operating easier. It features smart Number of Open Microphones (NOM) attenuation that sets the gain for all microphone inputs according to the number of microphone inputs utilized. This allows satisfactory levels to be set without feedback problems. A "Ducker" function operates when an input channel is open, to enable that channel's priority to initiate the

low channel signal that will attenuate the other channels.

Sound processing.

As a full-featured digital mixer, the D-901 incorporates several useful built-in functions to ensure maximum performance without needing other equipment. A compressor can be switched in to reduce the dynamic range between the smallest and largest signals, preventing amplifier clipping at high levels. The flexible crossover function allows setting speaker crossover points and filter slopes to optimize multichannel speaker systems. Full equalization and filter setting configurations can be saved in up to sixteen memories for instant recall. The time delay function can be used to align remote speakers.

Ergonomic control layout.

Convenient front panel controls and display make it easy to perform all functions and confirm parameter settings without requiring a PC. Another advantage is the ability to store up to 16 sound parameter setting configurations in memory for instant recall when required. These include crossover, EQ, filter slope settings, time delay and other parameters. Control settings can also be locked to prevent unauthorized tampering.

Wide application scope and remote control ability.

The D-901 can be externally controlled with an external signal trigger or the RS-232C port on the back panel which enables the D-901 to easily interface with external equipment.

Note: The D-901's heatsinks and aircooling are located at the bottom of the unit,

requiring a perforated ventilation panel to placed directly below the unit when rack-mounting is desired.

ote control capability in a compact,

Compression

All audio below a selected threshold is allowed to pass while audio above the threshold is compressed, reducing the dynamic range of the loudest sounds. This prevents signals from clipping

and distortion.

Feedback Suppression

Conventional suppression

Manual cancellation of feedback is imprecise as filtering problem frequencies affects neighboring frequencies as well. This tonally impacts the signal and often results in audio that does not sound natural.

TOA feedback suppressor

This proprietary technique works by automatically detecting the frequencies where acoustic feedback is occurring. Once these frequencies are detected, the suppressor automatically sets precise notch filters that drastically attenuate just those those frequencies with accurate pinpoint filtering.

Audio signals are therefore minimally affected because only the problem frequencies are attenuated to negligent levels through the suppressor's action.

Gain is increased

Level at which

Gain

Microphone gain is increased to induce feedback so that feedback susceptible frequencies can be located.

Gain

Microphone gain is automatically raised till feedback is induced.

Gain

Using a continuously variable filter makes it possible to insert filters at different frequencies.

feedback is likely to occur

Gain is increased

Level at which feedback is likely to occur

Feedback points

273Hz

Frequency

734Hz

Frequency

(feedback most likely to occur point)

Gain

Feedback is filtered and eliminated as soon as it starts. The intensity of filtering required will impact tonal characteristics resulting in altered sound.

Gain

When feedback is detected, do not increase gain. Staying at the same gain setting, start to look for other feedback-susceptible points across the entire frequency range.

Gain

For example, accurate pinpoint filters are set at frequencies of 273 Hz and 734 Hz.

level

Input signal

First peak

Level at which feedback is likely to occur

First filter

Searching for the points at which

feedback occurs.

Filter insertion

273Hz

Frequency Frequency

Level at which feedback is likely to occur

Frequency

734Hz

Frequency

level

threshold

level

time

Repeat

As microphone gain is increased and feedback occurs, a filter is inserted at that point. This step is repeated as many times as the number of filters required to be inserted to eliminate feedback.

Setting filters

Level at which

273Hz

feedback is likely to occur

Frequency

734Hz

Frequency

Gain

Because filters are simultaneously inserted at all detected feedback points, there is minimal impact on tonal characteristics.

Precise elimination of feedback

frequency components.

Gain

Since dividing filters are not used, sound quality does not deteriorate.

Output signal

Resulting characteristics

Original acoustic characteristics

of the room

Gain

A space’s acoustic characteristics that have been altered by filtering

The acoustic characteristics are now radically different from the original, resulting in sound with little resemblance to the original sound.

Resulting characteristics

Original acoustic characteristics

Gain

Flat equalization eliminates acoustic anomalies to allow clear PA reproduction.

time

of the room

Flat response

Frequency

This method has the least effect on audio

quality and allows

more natural-sounding

audio.

D-901 PC Software

The D-901 comes standard with dedicated software to assist in D-901 system configuration, parameter setting and general setup using a PC. The software features menu-driven operation with an easy to understand GUI. The software offers comprehensive control over virtually every possible function. For set up these include crossover slopes, combinations, and storing crossover configurations. For operation, menus offer dedicated pages for viewing and adjusting matrix, trim, EQ, compression, automix, gating, filtering, delay, echo and feedback suppression settings as well as mic/line input modules and many others. Presets can configured and stored for immediate recall when desired. In addition, the software allows determining user level as well as preparing the D-901 for remote control. Lastly, a full assortment of protection functions can be utilized.

*Download installation program from TOA's homepage

(http://www.toa-products.com/international/) and save it to the desktop.

Input/output Gain Compressor/Limier/Noise Gate

Crossover Delay

D-901 rear

Monaural type

A/D

Converter

D-922F

2-Channel input module for

mic and line inputs (selectable) with XLR connectors and DIP

mic and line inputs

20 bit

24 bit

switches for input sensitivity,

(selectable) with XLR

phantom power and ground lift.

connectors and DIP switches for input sensitivity, phantom power and ground lift.

D-921F

2-Channel input module for mic

2-Channel input module for

and line inputs (selectable) with XLR connectors, adjustable

mic and line inputs

input sensitivity, and phantom

(selectable) with XLR

power.

connectors, adjustable input sensitivity, and phantom power.

D-901 Modules

The D-901's modular design allows you to configure the most

cost-effective design for each application. TOA offers a range

of modules to suit a variety of input and output requirements.

INPUT MODULES

Mic/ Line Input Modules

Stereo type

XLR Connector

D-922E

2-Channel input module for mic

2-Channel input module for

and line level inputs (selectable) with removable terminal block

mic and line level inputs

connectors, input sensitivity

(selectable) with removable

DIP switches, phantom power

terminal block connectors,

and ground lift.

input sensitivity DIP switches, phantom power and ground lift.

D-921E

2-Channel input module for mic

2-Channel input module for

and line level inputs (selectable) with removable

mic and line level inputs

terminal block connectors,

(selectable) with removable

adjustable input sensitivity and

terminal block connectors,

phantom power.

adjustable input sensitivity and phantom power.

Removable Terminal

Block Connector

D-936R

4 stereo input module equipped with standard RCA jacks. This module features two stereo transmission mode:

1) Selection of one of the four stereo inputs.

2) Mixing of all four stereo inputs, transmitting the mixed signal to the D-901 though left/right channel outputs.

Digital Input Modules

Applicable AES/ EBU Format

D-923AE D-923AE

2-Channel digital input module. With 2-Channel digital input module. With

the use of this module, digital signals the use of this module, digital signals

can be input, permitting direct can be input, permitting direct

connection of the D-901 to equipment connection of the D-901 to equipment

having a digital output. Owing to the having a digital output. Owing to the

built-in sample rate converter, the built-in sample rate converter, it can

module can handle signals of various handle signals of various sampling

sampling frequencies. frequencies.

Applicable S/PDIF Format

D-937SP

Single channel stereo digital input

module. With the use of this module,

digital signals can be input, permitting

direct connection of the D-901 to

equipment having a digital output.

Owing to the built-in sample rate

converter, the module can handle

converter, it can handle signals of

signals of various sampling frequencies.

various sampling frequencies.

XLR Connector

OUTPUT MODULES

Line Output Modules*

Removable Terminal

Block Connector

RCA Pin Jack Connector

D-971M

4-channel line outputs module equipped with XLR connectors.

Digital Output Modules

Applicable AES/ EBU Format

D-972AE

4-channel digital output module. With the use of this module, digital signals can be output, permitting direct connection of the D-901 to equipment having a digital input.

REMOTE CONTROL MODULES

Remote Control Module

8 inputs

8 outputs

D-971E

4-channel line outputs module equipped with removable terminal block connectors.

Applicable S / PDIF Format

D-961SP

2-Channel stereo digital output module. With the use of this module, digital signals can be output, permitting direct connection of the D-901 to equipment having a digital input.

24 inputs

16 outputs

D-971R

4-channel line outputs module equipped with standard RCA pin

jack.

*Slots 5-8 accommodate only two D-971M and/or D-971E

Line Output Modules together or independently in total.

VCA Control Module

VCA control (20 channels) +

8 inputs 8 outputs

D-981

For external remote control of memory presets, gain control, stereo input selection and channel ON/OFF operation plus tally outputs.

D-911

VCA fader unit for controlling 12 inputs/ 8 outputs, channel gains and 8 contact controls when used with the D-984VC.

D-983

For external remote control of memory presets, gain control, stereo input selection and channel ON/OFF operation plus tally outputs.

D-984VC

By the VCA controls from external equipment, this module permits the D-901's gains of 12 inputs and 8 outputs to be controlled. By the contact input controls from external equipment, it permits preset memory recall, gain control, stereo input selection and channel ON/OFF operation plus tally outputs.

D-901 Control Unit

A dedicated VCA fader unit that significantly expands the operational scope of the D-901 Digital Mixer. It adds useful control capabilities when connected to the D-984VC. In such a connection setup, full VCA operation becomes possible, allowing all the D-901's 12 inputs and 8 outputs channel gain levels and 8 contact controls.

VCA FADER UNIT

Input fader control (12 channels)

D-984VC

D-901

(straight)

Cat. 5 cable

Contact control (8)

D-911

Output volume control (8 channels)

Examples of common system configurations

Microphones

Feedback suppressor function

Main Speaker R

Projector

Presentations

DVD Player

Ceiling

Speakers

CD Player

Power Amplifiers

Delay function

Microphones

Control equipment

Feedback suppressor function

Main Speaker R

Main Speaker L

Ceiling Speakers

Boardrooms / conference rooms

Power Amplifiers

Cassette Deck

Assemblies

Power Amplifiers

Projector

CD Player

Locked to prevent unauthorized tampering

Switch panel

Main Speaker R

Main Speaker L

Cassette Deck

For Room A

Switch panel

(gain control)

Switch panel

(gain control)

Microphones

Ceiling

Speaker

Microphone

Ceiling

Speaker

Microphone

Ceiling Speakers

Zoned areas

CD Player

Power Amplifiers

Ceiling Speaker

B-2

Room

Partitioning

ROOM

B-1

ROOM

A-1

ROOM

A-2

•Feedback suppressor function

•Automatic mixing function

Cassette Deck

CD Player

Ceiling Speaker

Microphone

Preset function (Partitioning compatible)

For Room B

Switch panel

(gain control)

Switch panel

(gain control)

Power Amplifiers

D-911

VCA Fader Control Unit

Multipurpose (lecture halls, meetings, etc.)

Projector

Microphones

Feedback suppressor function

Ceiling Speakers

CD Player

DVD Player

Power Amplifiers

Delay function

Video Control Sound

Control equipment

CD Player

DVD Player

Control equipment

2 Way Speaker

Crossover

filter

2 Way Speaker

Main Unit Specifications

D-901 Main Unit

Power Source

Power Consumption

Operating Temperature

Frequency Response

Input

Output

Signal Processing

Feedback Suppression Function Auto Mixing Function Auto Mixing Group Equalizer /Filter

Compressor/ Auto-Leveler

Delay Matrix Crosspoint Gain

Preset memory

Auxiliary Function

Control

Front Panel Section

Rear Panel

Finish

Dimensions Weight Accessory

Note: When installing the unit, never block the intake vents provided in the unit's bettom near the rear.

(Installation rackmount only)

100 – 120V, 230V AC, 50/60Hz

40W

+5° C to + 40°C

20 – 20,000Hz, ±1dB (±4dB*

Max. 12 channels, modular construction (modules optional)

Max. 8 channels, modular construction (modules optional)

12 filters (auto/dynamic) Ducker (automatic muting), NOM attenuation 4 groups Parametric equalizer: 20 – 20,000Hz, ±15dB, Q: 0.267 – 69.249

Filtering: High-pass filter 20 – 20,000Hz, 6 dB/oct, 12dB/oct Low-pass filter 20 – 20,000Hz, 6 dB/oct, 12dB/oct

Crossover filter: 20 – 20,000Hz, 6dB/oct, 12 dB/oct, 18dB/oct, 24dB/oct (Compressor mode)

Threshold: –20 to +20dB (1dB steps) Ratio: 1:1, 2:1, 3:1, 4:1, 8:1, 12:1, 20:1, Attack time : 0. 2ms – 5s Release time Gain: –

(Auto-leveler mode) Target level: –20 to +10dB Maximum gain: 0 to +20dB (1dB steps) Attack time : 10ms – 10s Release time

Delay time: 0 – 682.6ms (0.021ms steps) 12 x 8 –

System Locking function

RS-232C, D-sub connector (9 pins), Remote control module (option)

Preset memory recall key: 8, LCD Screen, Screen shift key (up/down/left/right), setting knob Input level indicator: Dual color LED, Output level indicator: Dual color LED Channel selector key: 12 (input channel selection) 8 (output channel selection), Channel volume control: 1 (input channel selection) 1 (output channel selection)

Input module slot: 6 (input/output module slot: 2) Output module slot: 2 Remote control module slot: 1

Panel: Aluminum, hair-line finish, black Others: Pre-coated steel plate, black, 30% gloss

482.6 (W) x 132.6 (H) x 320 (D) mm (excluding projection)

6.9kg

Power cord (2m) x 1, Rack mounting screw x 4, Rack mounting bracket (preinstalled on the unit) x 2, Module mounting screw (spare) x 4, Blank panel (preinstalled on the module slot) x 9, Fiber washer x 4

Notch filter 20 – 20,000Hz, Q: 8.651 – 69.249 All-pass filter 20 – 20,000Hz, Q: 0.267 – 69.249 High shelving filter Horn equalizer 20kHz, 0 to +18dB (1dB steps)

: 10ms to 5s

∞

: 100ms to 10s

to 0dB (1dB steps)

∞

Input)

6 – 20,000Hz, ±15dB

to +10dB

∞

Low shelving filter

*1 0dB = 0.775V

20 – 500Hz, ±15dB

Input Modules Specifications

Mic/Line Input Modules

•

Model

Input

Connector Type XLR-3-31 A/D Converter 24 bits 20 bits 24 bits Frequency Response 20 – 20,000Hz, ±1dB (+4dB* Sampling Frequency 48kHz Dynamic range Over 100 dB (IHF-A weighted) (+4dB* Total Harmonic Distortion Finish Panel: Pre-coated steel plate, black, 30% gloss Dimensions 35 (W) × 119.5 (H) × 178.4 (D) mm Weight 150 g 140 g 13 5 g 125g 145 g

Digital Input Modules

•

D-923AE D-937SP

Model

Input 2 channels, 2.0 – 7.0V (p-p), Stereo 1 channel line (Selectable one of four inputs),

Applicable Format AES/EBU (2 channel multiplexed) S/PDIF (2 channel multiplexed) Sampling Frequency 32 – 48kHz Finish Panel: Pre-coated steel plate, black, 30% gloss Dimensions 35 (W) x 119.5 (H) x 178.4 (D) mm Weight 130 g

D-921F D-921E*

2 channels, Mic/Line changeable

Mic: –50/–36dB* Line: –10/+4dB*

Phantom power supply (+15V, can be used when set for the microphone)

, 4.7kΩ, electronically-balanced

, 10kΩ, electronically-balanced

Ground lift switch

Removable terminal block

Under 0.05% (+4dB*1 input) Under 0.2% (+4dB*1 input) Under 0.05%

110Ω, XLR-3-31 or equivalent 0.5V (p-p), 75Ω, Coaxial RCA jack × 2

D-922F D-922E*2 D-936R

2 channels, –50/–36/–10/+4dB*

DIP switch), 4.7kΩ, electronically-balanced

Phantom power supply (15V, can be set with the DIP switch)

Ground lift switch (can be set with the DIP switch)

XLR-3-31

input) Over 85 dB (IHF-A weighted) (+4dB*1 input)

Accessory: (D-921E/D-922E)

(Selectable with the

Removable terminal block

input)

Removable terminal block type connector (preinstalled on the unit) × 2

Square optical connector × 2

(selection of 1 stereo or

mixing or all 4 stereo inputs)

RCA pin jack

Over 100dB (IHF-A weighted)

*1 0dB = 0.775V

4 stereo inputs

–10dB*1, 10kΩ

Output Modules Specifications

Mic/Line Output Modules

•

D-971M D-971E*

Model Output 4 channels, +4dB*1, adaptable load of

Connector Type XLR-3-32 D/A Converter 24 bits Sampling Frequency 48kHz Frequency Response 20 – 20,000Hz, ±1dB Dynamic range Over 100dB (IHF-A weighted) Total Harmonic Distortion Finish Dimensions 35 (W) x 119.5 (H) x 178.4 (D)mm Weight 165g140g 150g

Digital Output Modules

•

D-961SP D-972AE*

Model Output Stereo 2 channel line (with splitter, can be output to each pair 4 channels, 5.0V (p-p), 110Ω, XLR-3-32 or equivalent × 2

Applicable Format S/PDIF (2 channel multiplexed) AES/EBU (2 channel multiplexed) Sampling Frequency 48kHz Finish Panel: Pre-coated steel plate, black, 30% gloss Dimensions 35 (W) x 119.5 (H) x 178.4 (D) mm Weight 130 g

of optical output and coaxial output in Parallel),

0.5V (p-p), 75Ω, Coaxial RCA jack × 2

over

600Ω, electronically-balanced

Square optical connector × 2

Removable terminal block

Under 0.05%

Panel: Pre-coated steel plate, black, 30% gloss

4 channels (2 outputs for

RCA pin jack

–10dB*1,

D-971R

adaptable load of over 600Ω

*1 0dB = 0.775V

each channel),

Remote Control Modules Specifications

Remote Control Modules

•

Model

D-981*

Contact input

Control

Preset memory Any preset memory can be recalled.

selection

Volume control Any input/output channel volume can be turned UP or DOWN.

Channel Any input/output channels can be turned ON and OFF.

Stereo selection Input channel lines of the D-936R (optional) or the D-937SP (optional)

Contact output COM + terminals 1-8: No-voltage make COM + terminals 1-16: No-voltage make

contact input, contact capacity: 24V DC, contact input, contact capacity: 24V DC,

100mA removable terminal 100mA RJ45 connector x 4

Finish Panel: Pre-coated steel plate, black, 30% gloss

Dimensions 35 (W) x 119.5 (H) x 178.4 (D)mm

Weight 125g 170g

Accessory: (D-971E, D-981)

COM + terminals 1-8: Open voltage: 5V DC, COM + terminals 1-24: Open voltage: 5V DC, short-circuit current: 5mA removable short-circuit current: 5mA RJ45 connector x 4 terminal block type connector

block type connector

(D-972AE)

Control method: No-voltage make of over 100ms/no-voltage make single pulse of over 100ms

Control method: 1 step variation for no-voltage make single pulse of over 100ms

1 step continuous operation for every 70ms for no-voltage make of over 100ms. Can be reset when at break.

Variable range; – ∞dB to +10dB

Control method: No-voltage make of over 100ms/no-voltage make single pulse of over 100ms

(4 stereo input module) can be selected. Control method: No-voltage make of over 100ms/ no-voltage make single pulse of over 100ms

Removable terminal block type connector (preinstalled on the unit) × 2

Ferrite clamp × 2

D-983

VCA Control Module

•

Model

D-984VC

VCA control input +5V GND, Terminal 1 – 20 (12 input channels, 8 output

Contact input COM + terminal 1-8: Open voltage: 5V DC,

Control

Preset memory Any preset memory can be recalled. selection Control method: No-voltage make of over 100ms/

Volume control Any input/output channel volume can be turned UP or

Channel Any input/output channel can be turned ON and OFF.

Stereo selection

Contact output COM + terminal 1-8: No-voltage make contact,

contact capacity: 24V DC, 100mA RJ45 connector x 2

Finish Panel: Pre-coated steel plate, black, 30% gloss

Dimensions 35 (W) x 119.5 (H) x 178.4 (D)mm

Weight 170g

channels), RJ45 connecter x 4 Control contents: Volume control of each input/output channel Variable range: –

short-circuit current: 5mA, RJ45 connector x 2

No-voltage make single pulse of over 100ms

DOWN. Control method: 1 step variation for no-voltage make

single pulse of over 100ms 1 step continuous operation for every 70ms for no-voltage make of over 100ms. Can be reset when at break.

Variable range; –

Control method: No-voltage make of over 100ms/ No-voltage make single pulse of over 100ms Input channel lines of the D-936R (optional), or the D-937SP (optional) (4 stereo input module) can be selected. Control method: No-voltage make of over 100ms/

No-voltage make single pulse of over 100ms

dB to +0dB

∞

dB to +10dB

∞

VCA Fader Unit Specifications

D-911

Model

Power Supply 5V DC (supplied from the optional D-984VC) Connector RJ45 connector × 8 Input Fader Control Input fader (100mm) × 12 Output Volume Control Output volume control × 8 Contact Control Illuminated switch × 8 Remote Output Remote Switch Finish Dimensions 482.6 (W) × 177 (H) × 61.3 (D)mm (excluding projection) Weight 2.7kg Accessory Fader knob (Red, Yellow) × 3 each, Volume knob (Red) × 2,

No-voltage make contact output (contact capacity: 30V DC, 4A) Seesaw switch for activating the remote function of the power distributor Panel: Pre-coated steel plate, black, 30% gloss

Rack mounting screw × 4, Rack mounting fiber washer × 4, Rack mounting bracket (preinstalled on the unit) × 2

TOA Corporation

URL: www.toa.jp/

Specifications are subject to change without notice. Printed in Japan (0501) 833-52-301-3B u

TOA D-901 US User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual