background image

Contents

Introduction

.....................................................................................................................

3

What is a SmartMixer

?

.........................................................................................................

3

Features

..................................................................................................................................

3

Front Panel

.............................................................................................................................

4

Rear Panel

..............................................................................................................................

5

Installation and Setup

..............................................................................................

6

Priority Microphones and Lockout Bus

................................................................................

6

Preamplifier Gain

...................................................................................................................

7

Output Gain

............................................................................................................................

7

Phantom Power

.....................................................................................................................

7

Output Level LED Meter

........................................................................................................

8

Adjusting “Off” Attenuation

.................................................................................................

8

Control Voltage Out

...............................................................................................................

9

Daisy-chaining Mixers

.........................................................................................................

10

Rack Mounting

.....................................................................................................................

10

Security Caps

.......................................................................................................................

10

Specifications

...............................................................................................................

11

2

Caution

To prevent fire or shock hazard, do not expose this apparatus to rain or moisture.
To avoid electric shock, do not open the cabinet.
Refer servicing to qualified personnel only.
To prevent fire, do not place any naked flame sources (such as lighted candles) on this apparatus.
To prevent fire, do not cover the ventilation of this apparatus with newspapers, table-clothes, curtains, etc.
Do not expose this apparatus to drips or splashes.
Do not place any objects filled with liquids, such as vases, on this apparatus.
Do not install this apparatus in a confined space such as a bookcase or similar unit.
Install this apparatus only in places where ventilation is good.
This apparatus should be located close enough to the AC outlet so that you can easily grasp the AC adapter at any time.
In case of emergency, disconnect the AC adapter quickly.

Compliance with FCC rules (USA only)

This class B Digital device complies with part 15 of the FCC Rules. Operation is subject to the following two condi-
tions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

Caution for FCC

You are cautioned that any changes or modifications not expressly approved in this manual could void your authority
to operate this equipment.

Note:

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to

part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:

--Reorient or relocate the receiving antenna.
--Increase the separation between the equipment and receiver.
--Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
--Consult the dealer or an experienced radio/TV technician for help.

IC statement (Canada only)

This Class B digital apparatus complies with Canadian ICES-003. 
Cet appareil numerique de la classe B est conforme a la norme NMB-003 du Canada.

Summary of Contents for AT-MX341b SmartMixer

Page 1: ...Microphone Mixer Installation and Operation Lockout Manual Priority Pre select 1 2 3 4 20 10 6 3 0 3 6 Output Level Master Threshold Master Level Gain 1 Gain 2 Gain 3 Gain 4 Power AUTOMATIC MICROPHONE MIXER AT MX341b Selected Channel ...

Page 2: ... 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Caution for FCC You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment Note This equipment has been tested and found to comply with the limits for a ...

Page 3: ...o are carried between mixers by the link cable The result is that all microphones on a multi mixer system can be controlled by one micro phone connected to any mixer Since all of the mixers are independently powered there is no practical limit to the number of SmartMixers that can be daisy chained Features To custom tailor conferencing needs the mode of each microphone channel can be independently...

Page 4: ...n 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 7 Master Level control Normal setting is fully clockwise full output If reducing the mixer s output is necessary carefully turn the control counter clockwise as needed with a small screwdriver Once set as desired...

Page 5: ...tput Can be changed to mic level output via internal switch see page 7 XLRM type connector 5 Inputs Balanced microphone inputs for low impedance dynamic or condenser mics Can be changed to line level inputs via internal switches see page 7 XLRF type connectors Figure 2 Rear panel 5 Link In Link Out Output Input 3 Input 2 Input 1 12V AC 15 18V DC Control Voltage Out 1 GND 2 3 4 Input 4 Lockout Manu...

Page 6: ...shold control fully counterclockwise In this mode the unit will behave like a conventional four channel microphone mixer all automatic functions are bypassed 12 The Master Level recessed control on the front panel may be adjusted with a small screwdriver if necessary This control is at the last stage in the mixer and does not affect microphone gain threshold setting or meter indication Priority Mi...

Page 7: ...stances higher output microphones are used for close talking it may be necessary to reduce the preamplifier gain This can be done by changing switch settings inside the unit With the unit unplugged remove the two screws on each side of the unit and remove the top cover Locate the internal switches designated on the circuit board by S103 S203 S303 and S403 Figs 3 and 4 page 8 Changing the settings ...

Page 8: ...B VR202 VR302 and VR402 control off attenuation for channels 2 3 and 4 respectively Figure 3 Internal view of mixer Figure 4 Detail of internal controls Don t Touch Rear Panel Output Level LED Meter The Output Level LED meter is factory set to indicate RMS output Should peak output indication be desired simply unplug the unit remove the top cover and change the setting of the switch designated on ...

Page 9: ...Out goes high 4 VDC 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 dam age to the mixer may result Several interface circuit possibilities are shown in Figure 5 Figure 5 Control interface examples 9 ...

Page 10: ... to the unit When using more than one SmartMixer in a system it may be advantageous to mount two mixers in a 1U rack space This can be accomplished using the two short rack ears and an optional joining plate Model AT8628 which allows two units to be con nected side by side in a single rack space Security Caps For permanent installations where microphone selections positions and acoustic conditions...

Page 11: ... DC either polarity 300 mA Operating Temperature 32 to 104 0 to 40 C Dimensions 8 25 210 mm W x 9 38 238 mm D x 1 75 44 mm H including feet knobs and connectors Weight 3 1 lbs 1 4 kg Included Accessories AC adapter AT8325 1 0 Link Cable Optional Accessory AT8628 Double Rackmount Joining Plate In the interest of standards development A T U S offers full details on its test methods to other industry...

Page 12: ...P52324 2011 ...

Reviews: