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Related Manuals for Audio Technica AT-MX351a SmartMixer
Summary of Contents for Audio Technica AT-MX351a SmartMixer
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Page 1: Installation And Operation
AT-MX351a SmartMixer ® Automatic Mixer AT-MX 351a AUTOMATIC MIXER Output Level Gain Gain Gain Gain Aux In Master Monitor -20 -10 Priority Pre-select Power Selected Channel Lockout 1 2 3 4 MANUAL Installation and Operation... -
Page 3: Table Of Contents
Contents Introduction ........................5 What is a SmartMixer ? ......................5 ® Features .............................5 Front Panel ..........................6 Rear Panel ..........................7 Installation and Setup ....................8 Priority Microphones and Lockout Bus .................8 NOMA ............................9 Auxiliary Input ..........................9 Preampli er Gain ........................9 Output Level ...........................10 Phantom Power ........................10 Output Level LED Meter ......................10 Adjusting “Off”... -
Page 4: Installation Place
Installation and Operation Warning IC statement To prevent fire or shock hazard, do not expose the unit to rain or moisture. This Class B digital apparatus complies with Canadian ICES-003. Cet appareil To avoid electrical shock, do not open the cabinet. Refer servicing to qualified numérique de la classe B est conforme á... -
Page 5: Introduction
About internal adjustment Operating personnel must not remove equipment covers. Only qualified, experienced, authorized service personnel may remove equipment covers for any internal adjustments. The AT-MX351a SmartMixer is a microprocessor controlled, automatic switching, five-chan- ® Important caution for service personnel making internal adjustments nel mixer. -
Page 6: Front Panel
AT-MX351a Front Panel Power switch. Power “on” indicator. Input Gain controls. Adjust inputs for microphone sensitivities and/or operating conditions. Selected Channel LED indicators. Indicate which channels are “on” or “active.” Aux In control. Adjusts input for source output level and/or operating conditions. Output Level LED meter. -
Page 7: Rear Panel
AT-MX351a Rear Panel 1. External Control connector. For TTL output, plus closure-control input for external control of each channel. 2. Link In/Link Out. Provides for daisy-chaining of multiple mixers when more than four microphones are used. 3. Line/Mic balanced output. Level can be changed via internal switch (see page 10). XLRM-type connector. -
Page 8: Installation And Setup
Installation and Setup AT-MX351a SmartMixer setup tips: 1. Turn the Master level control to the minimum position. Proceed with steps 2-9. 2. Set all Priority DIP switches and Manual mode switch to “down” position. 3. Turn all four microphone Gain controls fully counterclockwise. -
Page 9: Noma
Mode 2…Priority Pre-select switches (1-4) Down In this mode, only one mic at a time can be “on.” The lockout bus shuts down all other mics until the first speaker pauses. As soon as the controlling microphone goes silent, the lockout bus goes inactive and any other mic can come on. -
Page 10: Output Level
The preamplifier gain may be reduced further, allowing the SmartMixer to accept line-level sources. Changing the settings of the internal switches designated by “S101,” “S201,” “S301” and “S401” will cause an input reduction of 50 dB for channels 1, 2, 3 and 4 respectively. Note that the appropriate internal switches can be used in combination for a total sensitivity reduction of up to 60 dB for each channel. -
Page 11: Rear Panel
Rear Panel Don't Touch ! Front Panel Figure 4. Internal view of mixer. LINE LINE LINE LINE S301 S401 S101 S201 S102 S202 S302 S402 S602 40dB 40dB 40dB 40dB LINE 30dB 30dB 30dB 30dB S103 S203 S303 S403 NOMA S601 Peak Gate... -
Page 12: Adjusting "Off" Attenuation
Adjusting ”Off” Attenuation In instances when the number of microphones in use is high, it may be necessary to increase the amount of “off ” attenuation per microphone to keep the total ambient noise level low. There are “off ” attenuation adjustments inside the unit. To adjust the “off ” attenuation of channel 1, unplug the unit, remove the top cover and locate the trimpot designated on the circuit board by “VOL102”... -
Page 13: Control Voltage Out
Control Voltage Out When a microphone channel turns “on,” as indicated by a Selected Channel LED on the front panel, the channel’s associated Control Voltage Out goes “high” (+4 VDC). See chart on page 12 for pin connection. This signal can be used to light indicator lamps, switch speaker zones on and off, select video cameras, etc. -
Page 14: Daisy-Chaining Mixers
Daisy-chaining Mixers When more than four microphones are needed, it is possible to daisy-chain multiple SmartMixers together through the Link In/Out connectors on their back panels (Fig. 2). Connect Mixer #1 Link Out jack to Mixer #2 Link In jack, etc. Mixer #1 output contains only audio from the first four microphones;... -
Page 15: Speci Cations
Speci cations Input Impedance 8,000 ohms ......Line 50,000 ohms ......50,000 ohms . - Page 16 ©...
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