MOTU UltraLite-mk4, Руководство пользователя

Страница: 33 / 94

H A R D W A R E I N S T A L L A T I O N
33
AUDIO CONNECTIONS
Here are a few things to keep in mind as you are
making audio connections to your UltraLite-mk4
interface.
Mic/instrument inputs with preamps
Connect a microphone, guitar, instrument or other
analog input to the XLR/TRS combo jack with
either a standard mic cable or a balanced cable with
a quarter-inch plug.
☛
Do not connect a +4 dBu (line level) signal to
the mic/guitar inputs without using the -20dB Pad.
It is recommended you connect line level signals to
the quarter-inch inputs on the rear panel instead.
-20 dB pad
Each mic/guitar input is equipped with a -20 dB
pad switch, to accommodate input signals that
could overdrive the input.
Phantom power
If you are connecting a condenser microphone or
another device that requires phantom power,
engage the mic input’s corresponding front-panel
phantom power button.
Preamp gain
The XLR input on each combo jack feeds an
independent preamp, which pr60 dB of
gain. Use the front panel detented trim knobs to
adjust gain as needed for each input. The LCD
provides visual feedback as you turn the trim knob.
Preamp gain is digitally controlled, so you can
make fine-tuned adjustments in 1dB increments.
You can also adjust preamp gain in the web app. See
“Device tab” on page 12.
Independent volume control for the instrument
input
When a quarter-inch plug is inserted into the
quarter-inch combo jack, its signal bypasses the
preamp. The gain knob on the front panel (and in
the Device tab of the web app) provides
independent volume control for the quarter-inch
input, which is adjusted and saved separately from
the preamp gain setting for the XLR mic input. The
volume range for the instrument input is zero to
+30 dB.
TRS quarter-inch analog inputs and outputs
Quarter-inch analog inputs and outputs are
balanced (TRS) connectors that can also accept an
unbalanced plug.
☛
Quarter-inch analog outputs are not
cross-coupled. Therefore, when connecting them
to an unbalanced input, use a TRS plug with the
ring disconnected. Not floating the negative
terminal will short it to the sleeve ground and
cause distortion.
Dedicated main outs
Like all I/O on the UltraLite-mk4, the main
outputs operate as an independent pair (they don’t
share signal with any other output pair). In a
standard studio configuration, the main outs are
intended for a pair of studio monitors, but they can
also be used as regular outputs for any purpose.
With adjustable converter trim, they support a
wide range of industry-standard reference levels.
Main out volume is controlled by the MAIN VOL
knob on the front panel: push it repeatedly until
you see
Main 1-2 in the LCD and then turn it to
adjust the master volume output.
Analog trims
All quarter-inch analog inputs and outputs can be
trimmed. This allows them to support a variety of
standards, including EBU-R68, SMPTE RP-155,
+4dBu, -10dBV, 2vRMS, 1vRMS.
The UltraLite-mk4’s quarter-inch analog inputs
are equipped with high-quality, digitally controlled
analog trim that provides a range from -96 to +22
dB in 1dB steps.