Audio Technica AT-MX351a SmartMixer Installation And Operation Manual Download Page 3

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Contents

Introduction

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What is a SmartMixer

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Features

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Front Panel

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Rear Panel

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Installation and Setup

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Priority Microphones and Lockout Bus

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NOMA

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Auxiliary Input

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Preamplifier Gain

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Output Level

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Phantom Power

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Output Level LED Meter

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Adjusting “Off” Attenuation

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Preamp Outputs

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Input Limiters

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Force-on/Force-off

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Control Voltage Out

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Daisy-chaining Mixers

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Rack Mounting

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Security Caps

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Specifications

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Summary of Contents for AT-MX351a SmartMixer

Page 1: ...ixer Automatic Mixer Installation and Operation Power AUTOMATIC MIXER AT MX351a Gain 1 Gain 2 Gain 3 Gain 4 Aux In Master Monitor Lockout Priority Pre select 1 2 3 4 MANUAL 20 10 6 3 0 3 6 Output Level Selected Channel ...

Page 2: ......

Page 3: ...Microphones and Lockout Bus 8 NOMA 9 Auxiliary Input 9 Preamplifier Gain 9 Output Level 10 Phantom Power 10 Output Level LED Meter 10 Adjusting Off Attenuation 12 Preamp Outputs 12 Input Limiters 12 Force on Force off 12 Control Voltage Out 13 Daisy chaining Mixers 14 Rack Mounting 14 Security Caps 14 Specifications 15 ...

Page 4: ... Prior to use of this product review all safety markings and instructions Warning This apparatus must be grounded This product is a safety class 1 product There must be an uninterruptible safe ty earth ground from the main power source to the product s AC input Whenever it is likely that the protection has been impaired disconnect the power cord until the ground has been restored An apparatus with...

Page 5: ...ccepting auxiliary level input from external audio devices There is no signal processing of the Aux input The mixer output is XLRM type balanced non inverting All AT MX351 model SmartMixers and AT MX341 model SmartMixers can be daisy chained via the included AT8325 1 0 Link Cable and special connectors on the rear panel The control bus and the audio are carried between mixers by the link cable The...

Page 6: ... 1 4 A switch in the up position assigns the respective channel priority over the other channels A priority channel can not be locked out by other channels Any combination of priority non priority selections is allowed 8 Manual mode switch Setting this switch in the up position bypasses all of the SmartMixer s automatic functions except limiting and NOMA if selected 9 Lockout LED indicator Shows w...

Page 7: ...ine level 10 dBV auxiliary input 6 Preamp Outputs Independent unbalanced 10 dBV switchable pre post controller outputs from mic channels 7 Inputs Balanced microphone inputs for low impedance dynamic or condenser mics Can be changed to line level inputs via internal switches see page 10 XLRF type connectors Can supply 48V phantom power via internal switches 8 Power input 100V 240V AC 50 60 Hz Figur...

Page 8: ...all automatic functions are bypassed except for limiting and NOMA if selected 11 Adjust the Master level control for desired output level This control is at the last stage in the mixer and does not affect microphone gain threshold setting meter indication monitor or preamp outputs Priority Microphones and the Lockout Bus Channels 1 4 Once the Gain controls have been properly adjusted an audio sign...

Page 9: ...ff position To turn on the NOMA function unplug the unit remove the top cover and change the setting of the switch designated on the circuit board by S601 Figs 4 and 5 page 11 NOMA serves to maintain overall system gain by proportionately reducing amplifier gain as the number of open microphones increases In a sound reinforcement system this can tend to preserve the feedback margin and system stab...

Page 10: ...rd by S102 S202 S302 and S402 Figs 4 and 5 page 11 Changing the settings of these switches will disable phantom power on channels 1 2 3 and 4 respectively Note that although they do not require phantom power for operation most balanced output dynamic microphones can be used without disabling the SmartMixer s phantom power Output Level LED Meter The Output Level LED meter is factory set to indicate...

Page 11: ...FF Gate OFF Gate OFF Gate OFF S305 S105 S205 S405 40 20 VOL402 Min 6 dB VOL302 Min 6 dB VOL202 Min 6 dB VOL102 40 20 40 20 40 20 S106 S206 ON OFF OFF S306 S406 OFF OFF VOL103 10 dB 10 dB 10 dB 10 dB VOL203 10 dB 10 dB 10 dB 10 dB VOL303 10 dB 10 dB 10 dB 10 dB VOL403 ON ON ON S602 MIC LINE OFF ON S601 NOMA S603 RMS Peak Don t Touch Figure 4 Internal view of mixer Figure 5 Detail of internal contro...

Page 12: ... gate these outputs unplug the unit remove the top cover and locate the switches designated on the circuit board by S104 S204 S304 and S404 Figs 4 and 5 page 11 Change the switch position s to Gating for channels 1 2 3 and or 4 respectively as desired Input Limiters Independent adjustable limiters are available on all mic channels To adjust the limiter threshold of channel 1 unplug the unit remove...

Page 13: ... 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 The control voltage should not be connected directly to an inductive load such as a relay coil as damage to the mixer may result Several interface circuit possibilities are shown in Figure 6 below Figure 6 Control interface examples 13 ...

Page 14: ...xers are linked with AT MX341 model mixers the NOMA function will pass through the AT MX341 models but their mics will not be included in the NOMA calculation Rack Mounting Provided with each mixer are two rack ears and six self tapping screws to attach the ears to the unit which allow the unit to be mounted in a 1U rack space Security Caps For permanent installations where microphone selections p...

Page 15: ...load Maximum Gain 73 dB Frequency Response 40 Hz to 22 kHz Equivalent Input Noise1 128 dBV 150 ohms at maximum gain Input Attenuation 10 dB Mic Line Input Pads 50 dB Maximum NOMA Attenuation 20 dB up to 100 mics on simultaneously Microphone Phantom Power 48V DC Control Voltage Out 4V DC Power Supply 100V 240V AC 50 60 Hz 30W Operating Temperature 32 to 104 F 0 to 40 C Dimensions 16 93 430 mm W x 9...

Page 16: ...1 1 0 2 3 2 3 2 5 P ...

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