OPERATING INSTRUCTIONS DIGITAL STEREO Mixer M-633D Thank you for purchasing TOA’s Digital Stereo Mixer. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
TABLE OF CONTENTS 1. IMPORTANT SAFETY INSTRUCTIONS ............................................ 3 2. SAFETY PRECAUTIONS .............................................................................. 4 3. GENERAL DESCRIPTION ........................................................................... 6 4. FEATURES ............................................................................................................. 6 5. HANDLING PRECAUTIONS ............................................................
1. IMPORTANT SAFETY INSTRUCTIONS • Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. • Read these instructions. • Keep these instructions. • Heed all warnings. • Only use attachments/accessories specified by the manufacturer. • Follow all instructions. • Do not use this apparatus near water. • Clean only with dry cloth. • Do not block any ventilation openings.
2. SAFETY PRECAUTIONS • Before installation or use, be sure to carefully read all the instructions in this section for correct and safe operation. • Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety. • After reading, keep this manual handy for future reference.
CAUTION When Installing the Unit • Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock. • When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock. • When moving the unit, be sure to remove its power supply cord from the wall outlet.
3. GENERAL DESCRIPTION The M-633D is a stereo mixer with digital signal processing functions such as Automatic Resonance Control function (ARC), Feedback Suppressor function (FBS), Automatic Clipguard function (ACG), and Automatic Mute function (AUTO MUTE). It can be mounted in an EIA component rack (1U size*). * 1U size = 44.5 mm (standard size) 4.
6. NOMENClATURE AND FUNCTIONS [Front] 3 8 12 13 14 5 4 15 16 12 6 1. Power switch Press this switch to turn on the power. To turn off the power, press this switch again. 2. Power indicator Lights green when the power is switched on. 3. Assignment switch cover A cover for protecting the setting positions of the Assignment switches (16) and ARC switch (4). It can be used as a writing plate. 4. ARC switch Press this switch to enable the Automatic Resonance Control function (ARC).
[Rear] 18 17 20 21 22 23 24 25 17. Stereo output terminals 0 dB*, 1 kΩ, electronically balanced type. Use the supplied removable terminal plug for connection. 22. Monaural output terminals 0 dB*, 1 kΩ, electronically balanced type. Use the supplied removable terminal plug for connection. 18. Auto mute switch Used to turn on and off the Automatic Mute function (AUTO MUTE). 23. Recording output terminal –10 dB*, 1 kΩ, unbalanced type. Use an RCA plug for connection. 19.
7. ASSIGNMENT SETTINGS It is possible to assign each input to 3 output channels individually (MONO 1, MONO 2, and STEREO). Pressing the Assignment switch "1" routes the input signal to the MONO OUT 1 output, switch "2" to the MONO OUT 2 output, and switch "ST" to the STEREO OUT output. Input signals assigned to the same output destination are mixed. [Assignment setting example] The figures below show an example of assignment settings of the inputs.
8. USING THE SUMMING OUTPUT KEYS It is possible to output the stereo input signals applied to the STEREO 1 – 3 to the stereo "L" and "R" outputs either in stereo mode or monaural mode. Summing output key [When the summing output key is pressed in (MONO position)] Signals applied to each of the input "L" and "R" channels are mixed and output to the stereo "L" and "R" outputs.
9. SETTING THE ARC FUNCTION 9.1. What is the Automatic Resonance Control (ARC) Function? It is a function that automatically creates a sound field compensation filter (ARC filter) to improve sound clarity by measuring the inherent acoustic characteristics in architectural space. 9.2. Outline of the ARC Function Settings The ARC function automatically creates an ARC filter, thereby reproducing highly clear output sound. 9.2.1. Enabling the ARC function (See p. 13 for details.
9.2.3. How to confirm the ARC enabled channel The output level indicator of the ARC enabled (ARC filter preset) output channel lights orange when the ARC switch is pressed. Light orange. ARC Press briefly, then release. An example that the ARC filter is set to the MONO OUT 1 and MONO OUT 2 channels. 9.2.4. ARC operation indicator status ARC measurement in progress ARC ARC filter ON ARC filter OFF ARC Flashing ARC Lit Unlit 9.2.5.
9.3. Enabling the ARC Function Notes • The ARC filter is created on the output channel selected with the Assignment switches at the ARC measurement. • The ARC filter previously set on the output channel will be updated by the newly created ARC filter after the ARC measurement. • To initialize the ARC filter, disable the ARC function. (See p. 20.) The ARC filters for all the output channels are initialized. They cannot be initialized individually.
Step 2. Connect a measuring microphone. The microphone for normal use can be used. 2-1. Connect the microphone to the phone jack or removable terminal block of MONO IN 1/ARC on the rear panel. 2-2 2-2. Set the input sensitivity selector switch to the appropriate position depending on the microphone to be connected. Dynamic microphone: MIC Phantom powered condenser microphone: PHANTOM Wireless tuner output (Line level): LINE 2-1 Step 3. Check to see if the microphone works correctly. 3-1.
When the indicator lights red Input signal is too big. • Check the position of the input sensitivity selector switch on the unit's rear panel. Try to set the switch to "LINE." Step 4. Select the output channel. Press in the MONO 1’s assignment switch corresponding to the output channel to which the ARC filter is set. 4 5-1 Step 5. Set the output volume level. 5-1. Turn the output level control knob corresponding to the assignment switch selected in Step 4 to the 12 o'clock position.
Step 6. Install the measuring microphone. It is recommended to install the microphone as shown below as a guide. [Microphone setting example] Height of the microphone: At the listening position Angle of the microphone: 45 º up Location of the microphone: About the center of the room (See the figure below.) Direction of the microphone: Point to the speaker. (See the figure below.) [Microphone setting example] School room: Point to a platform.
Step 7. Conduct ARC measurement. ARC Switch ARC operation indicator Hold down the ARC switch for 3 seconds. The ARC operation indicator begins to flash and the measurement starts. ARC ARC Hold down for 3 seconds. ARC Release when the indicator begins to flash. ARC Flashes during the measurement. Unlit Measurement in progress ARC Measurement stops. Press Notes • To stop measurement partway, press the ARC switch.
Measurement starts. The signals input to the MONO 2 – 6, and STEREO 1 – 3 are muted during measurement. (Only MONO 1's signal is output.) The FBS function and Automatic mute function are temporarily turned OFF. When the ARC operation indicator flashes rapidly soon after measurement starts.* MONO 1 is not assigned to any output. Check the assignment setting. (See Step 4 on p. 15) Volume adjustment: Specific tone sounds twice. When the ARC operation indicator flashes rapidly* Input level is too small.
9.4. Making Fine Acoustic Adjustment When finer acoustic adjustment is required, different ARC filters can be set for individual output channels. [Setting example in a gymnasium where the unit's output channels are assigned as follows] Set different ARC filters to the MONO OUT 1 channel and STEREO OUT channel.
Step 2. Set ARC filter only to the STEREO OUT channel (Stereo speakers installed at both sides of the stage). 2-2 2-1 Press in (ON). 2-1. Press in only the MONO 1’s assignment switch "ST" to turn it ON. 1: OFF 2: OFF ST: ON 2-2. Turn the output level control knobs as follows. MONO OUT 1: To the "0" position STEREO OUT 2: To the 12 o'clock position. 2-3. Adjust the volume level of the output amplifier connected to the STEREO OUT. 2-4. Conduct ARC measurement. (See Step 7 on p. 17.
10. SETTING THE FBS FUNCTION 10.1. What is the Feedback Suppressor Function (FBS)? It is a function that the built-in feedback suppressor filter automatically works to suppress acoustic feedback when the feedback occurs. Level Feedback suppressor filter Frequency Feedback frequency 10.2. Setting the FBS Function If acoustic feedback occurs when the FBS function is enabled, the feedback suppressor filter automatically operates to suppress the feedback.
11. SETTING THE AUTOMATIC MUTE FUNCTION 11.1. What is the Automatic Mute Function (AUTO MUTE)? It is a function that attenuates the signal input to the STEREO 1 through 3 by detecting signals input to the MONO 1 – 6. AUTO MUTE is also called as Ducker. This function helps to have paging announcements heard distinctly by attenuating the BGM volume when initiating the announcement during BGM broadcast.
12. AUTOMATIC CLIPGUARD (ACG) FUNCTION It is a function that automatically control input sensitivity to an appropriate value when the broadcast is distorted in the presence of an excessive input signal. For example, the ACG function prevents the broadcast from being made with its sound distorted even if a line level signal is erroneously applied to the MONO IN input set to "MIC." The ACG function operates on each channel with the input sensitivity selector switch placed in "MIC" or "PHANTOM" position.
13. RESETTING TO FACTORY DEFAULT SETTINGS Step 1. Disable the ARC function. (See p. 20.) Step 2. Disable the FBS function. (See p. 21.) Step 3. Turns off the Automatic mute function. Shift the rear-mounted AUTO MUTE switch to the OFF position. Step 4. Disable the ACG function Shift all the Input sensitivity selector switches of the rear-mounted MONO IN 1 – 6 to the "LINE" position. 3 4 The settings are returned to the factory default settings. 14. INSTALLATION 14.1.
CAUTION When installing the unit in an equipment rack, do not to block the ventilation slots on the unit's sides and rear. Doing so may cause heat to build up inside the unit and result in fire. Rack Power amplifier Blank panel M-633D 14.2. Mounting on a Desk When installing the unit on a desk, attach the supplied rubber feet to the unit's bottom surface.
15. CONNECTION 15.1. Connection Example Playback devices (such as cassette deck, CD player, or MD player) Wireless equipment Microphones DOWN M-633D Power amplifier Speakers Speakers 15.2. Phantom Power Supply • Set the rear-mounted Input level selector switch to "PHANTOM" position only when connecting a microphone which requires phantom power (+24 V, 10 mA) to the corresponding input terminal.
15.3. Removable Terminal Plug Connection Notes • Be sure to use shielded cables for audio signal lines. • Avoid soldering cable conductor, as contact resistance may increase when the cable is tightened and the solder is crushed, possibly resulting in an excessive rise in joint temperatures. [Cable end treatment] Shielded cable 7 mm (0.28”) 20 mm (0.79”) [Connector connections] Step 1. Loosen the terminal screw, then insert the cable. Step 2. Retighten the terminal screw.
16.
Analog BUS STEREO MONO L R 1 2 SIGNAL VOLUME RED GREEN D/A LA MONO OUT 1 ARC D/A LA MONO OUT 2 ARC D/A LA ST OUT L ARC D/A LA ST OUT R D/A LA REC OUT L D/A LA REC OUT R ARC 0 dB 0 dB 0 dB 0 dB −10 dB −10 dB 0 dB = 1 V [dB] LINE (0 dB) STEREO (0 dB) REC OUT (–10 dB) +20 +10 0 −10 −20 −30 −40 −50 −60 29
17. DIMENSIONAL DIAGRAM Unit : mm (in) [Front] 31.8 44 46.8 483.6 (19.04) 466 (18.35) 420 (16.54) (1.25) (1.73) (1.84) [Rear] [Side] 22 (0.87) 20 (0.79) 30 20 (0.79) 341.3 (13.44) 320 (12.
18. SPECIFICATIONS Model No.
• Accessories Power cord (2 m or 6.56 ft) ......................... 1 Removable terminal plug (3P) .................. 10 Rubber foot ................................................. 4 Rack mounting bracket ............................... 2 Rack mounting screw 5 x 12* ..................... 4 Machine screw M3 x 8 ...............................
