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3.2 Input Routing
The two-channel models, VMA260 and VMA2120,
include a default routing of Input channels 1-3, Music
1 and the Bluetooth/USB source to amplifier 1. Input
channels 4-6 and Music 2 are routed to amplifier 2.
The user may take any input and have it routed to
both outputs by selecting the appropriate switch. For
example, if you set switch 1 to ON, Input 1 will be
routed to both AMP1 and AMP2.
3.3 Configuration Settings
A DIP switch is available for each output channel to configure the unit to your
specific system.
3.3.1 70V/100V Output Selection
When this switch is in the “OFF” position, the amplifier is configured to drive low
impedance speakers, (4 Ohms ,minimum) The 70V/100V switch will activate the built-
in output transformer allowing the unit to directly drive 70V or 100V speaker systems
when connected to the appropriate output terminals. As an added feature when
driving the high impedance speakers, the system automatically apply a 70Hz high
pass filter.
3.3.2 Chime Function
Turning chime ON will enable a chime sound
at the onset of an announcement when priority
muting is invoked. (See section 3.5, Priority
Muting, on the following page.)
3.3.3 Line/Mic Gain Switch
Additional gain is available for use with sources,
in particular microphones, that have low output levels. Switching to MIC position
activates 48dB additional gain. Use only when necessary as the added gain may
cause higher noise levels.
3.3.4 Phantom Power
Phantom power (27V) can be applied to specific mic inputs by turning on the
appropriate Phantom Power switch.
1-70V/100V Output
2-Chime
3-Input 1 Line/Mic
4-Input 2 Line/Mic
5-Input 2 Phantom
6-Input 3 Line/Mic
7-Input 3 Phantom
8-Not Used
CH1 Settings
OFF
OFF
LINE
LINE
OFF
LINE
OFF
NC
ON
ON
MIC
MIC
ON
MIC
ON
NC
