User's Guide QuadMic
© RME
5
6. Operation and Usage
6.1 Controls
The front of the QuadMic has the gain knobs, switches for low cut, phantom power and phase,
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 reference level selected on the back of the unit plus a headroom of 9 dB is
reached. At Hi Gain the LED lights up at +17 dBu output level, sel4 dBu it lights up at
+11 dBu.
SIG
(Signal) indicates the presence of an input signal. The threshold of –25 dBu is rather high
compared to other equipment. With this, SIG also indicates a useful output level, maintained by
a correct GAIN adjustment.
GAIN
allows a step-less and very precise adjustment of the amplification b10 dB and
+60 dB.
+48V
(switch) activates phantom power. Gene48 V draws additional current. Therefore
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.
The back of the QuadMic has the 4 analog inputs and outputs, the power supply connector
AUX
, and the choice of reference level.
MICROPHONE / LINE INPUTS
: 4 Neutrik XLR / TRS combo jacks. Thanks to the servo bal-
anced designs and a high maximum input level (+11 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
: 4 TRS (stereo) jacks. The electronic output stage is built in a servo
balanced design which handles monaural (unbalanced) and stereo jacks (balanced) correctly.
Hi Gain / +4 dBu
: Defines the reference level of the Line Level Outputs. See chapter 6.3, Line
Outputs.
AUX
: Connect power supply, lead-battery or battery. See chapter 5, Power Supply.
