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953.028UK User Manual 

Introduction 

 

Thank you for choosing an Adastra MM321 mic/line mixer with built-in media player as part of your sound reinforcement system. 
This unit is designed to offer high quality, dependable service for audio mixing and distribution.  

Please read this manual to gain the best results from your product and avoid damage through misuse. 
 

SAFETY SYMBOL AND MESSAGE CONVENTIONS 

 

 

CAUTION 

RISK OF ELECTRIC SHOCK 

DO NOT OPEN 

AVIS 

RISQUE DE CHOC ELECTRIQUE NE PAS 

OUVRIR 

 

 

 

 

 

 

This symbol indicates that dangerous voltage constituting a risk of electric shock is 

present within this unit

 

 

 

 

This symbol indicates that there are important operating and maintenance instructions in 

the literature accompanying this unit.

 

 

 

SAFETY NOTICE 

 

1.

 

Prior to use, read through this manual

 

2.

 

Keep the manual in good condition 

3.

 

Pay attention to safety warnings 

4.

 

Observe all operating requirements 

5.

 

Do not use the device near water or wet areas 

6.

 

For cleaning, only use a lint-free, dry cloth 

7.

 

Install according to the specifications 

8.

 

Place away from heat sources or heating appliances 

9.

 

Use mains lead provided and avoid damage to cable or connectors 

10.

 

Unplug power from mains during stormy weather or if unused for long periods 

11.

 

In case of malfunction, water ingress or other damage, consult qualified service personnel 

12.

 

Do not place in damp areas or near liquids or moisture. Do not spill liquids on the housing 

13.

 

Please pay attention to warning symbols during transit and placement 

14.

 

Terminals marked with the   symbol are HAZARDOUS LIVE and should only be connected by qualified personnel 

15.

 

Ensure that the apparatus is connected to a mains socket with a protective EARTH connection 

16.

 

Ensure correct operation of the mains switch 

 

Warning 

 

To prevent the risk of fire or electric shock, do not expose any components to rain or moisture. 

If liquids are spilled on the casing, stop using immediately, allow unit to dry out and have checked by qualified personnel before 
further use. Avoid impact, extreme pressure or heavy vibration to the case 

No user serviceable parts inside 

 Do not open the case 

 refer all servicing to qualified service personnel. 

 

Safety 

 

 

Check for correct mains voltage and condition of IEC lead before connecting to power outlet 

 

Placement 

 

 

This unit can be used free-

standing or fixed into a 19”

 rack 

 

Ensure adequate support and access to controls and connectors when rack-mounting 

 
Cleaning 

 

 

Use a soft cloth with a neutral detergent to clean the housing as required 

 

Do not use strong solvents for cleaning the unit 

 

 

 

 

 

 

Summary of Contents for MM321

Page 1: ...1U Rack Mic Line Mixer with Bluetooth USB FM Tuner Item ref 953 028UK User Manual Version 4 0 Caution Please read this manual carefully before operating Damage caused by misuse is not covered by the warranty ...

Page 2: ... mains during stormy weather or if unused for long periods 11 In case of malfunction water ingress or other damage consult qualified service personnel 12 Do not place in damp areas or near liquids or moisture Do not spill liquids on the housing 13 Please pay attention to warning symbols during transit and placement 14 Terminals marked with the symbol are HAZARDOUS LIVE and should only be connected...

Page 3: ... Outputs are available on L R balanced XLR 18 for stereo operation and a single 6 3mm unbalanced jack 19 summed to mono Record outputs on L R RCA 20 are unaffected by the Master level control 1 3 5mm AUX input to media player 9 Aux line input 1 level control 2 USB port 10 Aux line input 2 level control 3 Media player control panel 11 Bass EQ boost cut control 4 Media player LCD display 12 Treble E...

Page 4: ... connected speakers Increase the Master output level if required and set the relevant channel level control to the required volume Repeat the above steps for all connected inputs whilst balancing the levels between channels as required For the AUX line inputs a single rotary control for each 9 10 adjusts the level of both left and right RCA inputs Channel 1 input also has an override function whic...

Page 5: ... Holding the Previous track or Next track buttons will adjust the output volume of the player down or up The Bluetooth name can be customized to enable identification of individual nearby amplifiers To customize the Bluetooth number press and hold the Play Pause button until adastra_0000 is displayed with one of the characters flashing Press Previous or Next buttons to edit the number and Play Pau...

Page 6: ... line inputs When other media player sources are selected this AUX input is muted Specifications Power supply 100 240Vac 50 60Hz Fuse T1AL Inputs 3 x XLR jack bal unbal mic line 2 x Aux L R RCA 3 5mm jack to media player Audio source Internal Bluetooth USB FM Aux player Outputs L R XLR Mono 6 3mm jack Record out RCA Emergency control 24V contacts mute all except channel 1 Phantom power 20V switcha...

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