6. Operation and Usage
6.1 Controls
The front of the OctaMic has the gain knobs, switches for low cut, phantom power and phase,
Clip Hold, Reference Level and several status LEDs:
+48V (LED) lights up when phantom power is active. Phantom power should only be activated
when using condensor microphones which require such a power supply.
The CLIP LED has been designed to act like the OVR LEDs of the ADI-8 series. It lights up 2
dB before the chosen reference level plus a headroom of 9 dB. At Hi Gain the LED lights up at
+17 dBu output level, selecting +4 dBu it lights up at +11 dBu.
SIG (Signal) indicates the presence of an input signal. The LED has a detection range of more
than 50 dB using multiple brightness states. With this, SIG acts as useful level control, helping
to set GAIN correctly.
GAIN allows for a stepless and very precise adjustment of the amplification between +10 dB
and +60 dB.
+48V (switch) activates phantom power. Phantom power should only be activated when using
condensor microphones which require such a power supply, and only on the specific channel.
LO CUT activates a hi-pass at 80 Hz, 18 dB per octave. This filter can remove rumble and
other low frequency noise.
PHASE changes the polarity. Phase cancellations and sound changes can be caused by using
multiple microphones at different places, or wrongly soldered cables. In such cases PHASE can
eliminate the error by adding an additional phase inversion.
Clip Hold is activated by pressing the key for two seconds. As soon as an overload is detected,
the corresponding Clip LED begins to flash once per second. With this, a momentary overload
stays visible for a longer time. Pressing the key once resets the Clip display. Pressing the key
again for two seconds deactivates the Clip Hold mode.
Hi Gain / +4 dBu / -10 dBV: Defines the reference level of the Line Level Outputs. See chap-
ter 6.3, Line Outputs.
The back of the OctaMic has the 8 analog inputs and outputs, the power supply connector
AUX, the analog D-sub output, or the optional ADC module (see chapter 7) with all the digital
inputs and outputs.
MICROPHONE / LINE INPUTS: 8 Neutrik XLR / TRS combo jacks. Thanks to the servo bal-
anced designs and a high maximum input level (+10 dBu), the inputs can be used balanced or
unbalanced, with XLR or TRS jack, with microphone or line levels – nearly everything is possi-
ble.
LINE LEVEL OUTPUTS: 8 TRS (stereo) jacks. The electronic output stage is built in a servo
balanced design, handling monaural (unbalanced) and stereo jacks (balanced) correctly.
AUX: Connect power supply, lead-battery or battery. See chapter 5, Power Supply.
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General