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AMPERES MX2222 PRE-AMPLIFIER MIXER
Parts Identifications and Functions
8. BGM SOURCE SELECTION INDICATOR LEDs
Selected BGM source is indicated by the corresponding LED.
9. MAINS POWER SWITCH
This switch controls the ac power source to the mixer. If the unit is also connected to 24V DC back up supply, power will
still be supplied to the mixer even when the switch is Off.
10. AC POWER INLET
The unit operates under 220 - 240V AC mains supply unless otherwise specified. The AC fuse located at the IEC connector
is rated at max 5A.
11. 24V DC INPUT TERMINAL
MX2222 can also operate using 24V DC supply. When both AC and DC sources are available and connected to the mixer,
it will operate using the mains supply whereas DC source shall take over when the mains is disconnected.
We recommend that only a regulated 24V DC supply is used. Do not connect directly to the charging battery terminals as
back up source as this may damage the unit.
12. MIXER MAIN OUTPUT
The XLR connector provides balanced line output for all mixed signal sources. It is electronically balanced with 600 Ohm
impedance with +4 dbU output level.
13. REC AND BGM OUTPUTS ( PHONE JACK )
These outputs are designated as Rec ( Record - unbalanced ) and BGM ( Background Music - balanced ). Record provides
line audio (-4 dBu) for external recording purpose while BGM audio is available for selected BGM sources. This can be
used for dual channel BGM / Paging broadcast system ( Uninterrupted Paging ).
14. CHIME & EXT MIXING INPUTS
These two input jacks facilitate external priority inputs which will mute other channels ( except Mic/Line 1 and 2 ). Muting
or mixing level can be adjusted at knob part number 16. Chime input is unbalanced whereas Ext.Line input is balanced.
15. BGM SOURCE INPUTS ( RCA JACKS )
BGM sources labeled as Cass, CD, Tuner and Aux with RCA unbalanced line inputs can be selected using the front daisy
chain source selector button.
16. PRIORITY MUTE LEVEL KNOB
It controls the muting or mixing level of priority channels ( Mic/Line 1,2, Ext Mixer & Chime ) and the other sources. It can
be set to totally mute or mix for normal audio mixer applications. Adjust to “Max” shall cut all non priority audio whereas
“Min” shall provide normal audio mixing.
17. MIC / LINE INPUTS ( XLR BALANCED )
By defaults, all XLR inputs has been set to Mic level. In case line input is required, some jumper setting inside the unit has
to be done. See section “ Changing Input Level ”
18. PHANTOM POWER SWITCH
Phantom power of 12V DC for Input CH1 to CH4 is available for application with condenser microphones. It is recommend-
ed to be switched off for use with dynamic microphones or other active input sources.
