User guide
Output Input (Signal)
The Signal Output Input push button selects which amp stage the Signal indicator is
monitoring. When the button is pushed in, the light will indicate signal strength measured at
the input of the final amp stage. When the button is out, the light will indicate signal strength
at the output of the 2108.
Button In. It is useful to push this button in and monitor the input while adjusting the Gain
control. This can help determine how hard you want to drive the first stage. The SIGNAL
indicator is a tri colored LED. It will be green when a low level signal is present, changing to
amber, then red as signal strength is increased. Important Note! Red does not indicate
clipping. When monitoring the Input (button in) red indicates the level at which gentle
saturation begins. It is possible to drive the 2108 with a healthy amount of gain resulting in
the signal light flashing red 50% of the time. This will produce a harmonically rich sound with
a bit of edge. Trust your ears.
Button Out. Pushing the button out provides monitoring of the signal that is adjusted by the
Output control. This can help you stay on top of levels fed to your recorder or subsequent
device. In this state, red indicates 12db which does not indicate clipping, but serves as a
warning to check the level at the next device in line (recorder, mixer, A/D unit, etc.).
On / Off (Power)
This button switches the DC power from the DC-30 Power Supply. When the button is toggled
up the 2108 will “pause” for about 4 seconds before audio can be heard. This mute period
eliminates power up and power down noise. The 2108 must be connected to the DC-30
Power Supply with the supplied 7 pin XLR cable and the DC-30 AC switch must be on. In
normal use the 2108 On / Off button can serve as a “standby” or “signal mute” switch.
Please read the DC-30 Power Supply section starting on page 5 of this manual.
2108 Rear Panel
The rear panel (Figure ) has two identical channels each with MIC INPUT and LINE OUTPUT
XLR connectors. Also, the rear panel has a DC POWER INPUT receptacle. These connectors
are discussed in the following sections.
Figure 2: 2108 rear panel
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