13
27. Line/Mic (DIP switch 2+3)
The switch is used to alter the sensitivity of the XLR input for line and microphone.
With the 2 DIP switches in the ‘
down
’ position, Input 1 is set to
Line sensitivity
.
With the 2 DIP switches in the ‘
up
’ position, Input 1 is set to
Mic sensitivity
.
For sensitivity levels, see Technical Specification on page 22-23.
28. Phantom Power On/Off (DIP switch 4)
Electret microphones need a DC bias to function. This DC bias, when provided by the host
amplifier, is commonly called phantom power.
With the DIP switch in the ‘
down
’ position phantom power is turned
ON
.
With the DIP switch in the ‘
up
’ position, phantom power is turned
OFF
.
The phantom power or bias voltage is approximately 12V (some variation occurs,
depending on the loop driver model).
Note 1
Phantom Power should only be turned on when an electret microphone is connected to the
amplifier.
Note 2
Before connection of an electret microphone needing more phantom power than 12V, a
microphone pre-amplifier must be used. If such a pre-amplifier is connected to the XLR
connector in Input 1, the phantom power should be turned off (switch 4 in 'up' position)
and the sensitivity be set to line level (switch 2+3 in 'down' position).
