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a. Guidepost of the front panel
(1) Power LED
(2) CHANNEL 1 Output Level Display LED
(3) CHANNEL 2 Output Level Display LED
(4) Phantom Power Switch
(5)(6) Phase Reverse Switch
(7)(8) 20dB PAD
(9)(10) Combination Microphone (XLR) and Instrument (1/4 inch) input
(11)(13) Input Gain Control (0 to 30 dB)
(12)(14) Drive Control (0 to 40 dB)
b. Supplementary Descriptions
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Phantom Power Switch (4):
XLR Connector
PIN1 ( Ground ) GND
PIN2 ( Positive ) +48V
PIN3 ( Negative ) +48V
Phantom
Power Supply
-Phase Reverse Switch (5 for CHANNEL 1 and 6 for CHANNEL 2):
-20dB Pad (7 for CHANNEL 1 and 8 for CHANNEL 2):
-Input Gain (11 for CHANNEL 1 and 13 for CHANNEL 2):
This switch activates the +48 volts phantom power to supply condenser mics and
any other devices requiring continuous power by means of the XLR cable. The +48V
is applied both to the positive (pin2) and negative inputs (pin3) of the XLR connector:
Caution: Please make sure that you are using an appropriate microphone before
you activate this switch to supply the +48V phantom power. Read the operating
instructions accompanying the microphone. Some condenser mics might need
another type of power supply, old dynamic microphones could be damaged by the
+48V voltage, and unbalanced microphones should never be operated in combination
with a +48V power supply.
This Phase Reverse Switch reverses the audio signal's phase by 180 , Normally,
you won't need this switch, however, in some cases, it might be necessary, for ex-
ample: the inversion of the pins of the XLR connector may be necessary to alter
the audio phase of two link microphones to compensate for phase cancellation. It
may be required that the wiring of a cable's XLR connector be switch to successfully
utilize Phantom power.
A 20dB Pad is available on each channel to attenuate the incoming signal level to
provide increased "headroom" for the operator.
This control sets the amount of boost to the signal being processed by this pre-
amplifier. Use this control to adapt the MICtube to either home recording level