Connecting to the Audio Interface
To use a microphone, plug the microphone’s XLR cable into any of the universal
inputs. Whenever an XLR cable is connected to a universal input, the microphone
preamp is enabled and the gain range of the trim knob is set to range from +10 to
+58dB. The input impedance of each microphone preamp is 1.5Kohms. Full-scale
input is 9dBu with the trim set to minimum gain.
Layla3G and Gina3G provide 48 volts of phantom power for microphones that
require it. To enable phantom power for Layla3G, press the button l48v
(the LED next to it will light up) and phantom power will be provided to all
microphone inputs. Gina3G has a switch in the console software for this purpose.
Note:
Phantom power will not be applied to any line level equipment or
guitars plugged in using cables with ¼” connectors.
To record a guitar or line level signal, just plug a cable with a ¼” connector into
one of the universal inputs. Whenever a ¼” cable is connected to a universal input,
the guitar/line preamp is enabled and the gain range of the trim knob is set to range
from 0 to +45 dB. The guitar/line preamp can support both guitar & line level
signals. The input impedance of each guitar/line preamp is 102Kohms. Full-scale
input is 18dBu with the trim set to minimum gain.
If you want to adjust the input level of a universal input, just turn the trim knob and
watch the corresponding level meter. The red light at the top will light anytime the
input signal is greater than –6.5dBFS (or within 6.5dB of clipping). The yellow
light represents a signal greater than –12.5dBFS, and the green light represents a
signal greater than –24.5dBFS.
For optimal audio quality, you should adjust the input trim knob so that your
loudest recorded signal lights up the yellow light, but not the red. When the red
meter light shines extra bright – you’ve clipped! If the signal level ever exceeds
0dBFS the signal will be “clipped” and you will hear a “pop” or “tick” in the
recording. This is a
very bad thing
, and clipping should be avoided at all costs!
There is enough headroom so that you can be conservative in this area, and there is
no need to push the input levels right up to the edge of clipping.
14
Connecting to the Audio Interface
