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4. Hooking up Audio and
MIDI to the US-224
4.1 Hooking up audio
To monitor output from your computer,
connect the analog outputs of the US-224 to
your mixer, amplifier or powered monitors.
Output volume is controlled by the LINE
OUT level pot. If you’ve got a digital mixer,
external D/A converter, or other device with
S/PDIF input, you may prefer to monitor via
the US-224’s S/PDIF output.
To record audio from the US-224 into your
computer, simply connect a device to the
appropriate input. Microphones should be
plugged into the INPUT A or B XLR inputs.
Note that the US-224 does not supply
phantom power, so if you’re using
condenser mics, you’ll need an external
preamp or power supply. You can connect
line-level sources (e.g., keyboards and
sound modules) into one of the two LINE
INPUTS (A or B). If you wish to plug in a
guitar, bass, or other high-impedance
source, simply move the sliding switch
below the Input Trim control to the “Guitar”
position. Finally, digital sources (e.g., CD
players, DAT’s etc) may be connected to the
S/PDIF INPUT.
The inputs of channels A and B are
available as either balanced XLR mic-level
inputs, unbalanced (1/4”) line-level inputs,
or S/PDIF digital inputs. Digital output is
taken directly from the stereo output of your
digital audio application. Digital input is
chosen in the US-224’s Control Panel, as
detailed in Section 5.1.
While it’s possible to use both mic and line
level analog inputs simultaneously on either
input, in actual practice this is not
recommended, as the signal level of the
inputs will be summed and very likely
interfere with each other.
Inputs A and B are also switchable between
the analog inputs and the S/PDIF digital
input. The input source is selected in the
US-224 Control Panel main page. (See
section 5.1 for details).
Input level for analog sources is regulated
by the TRIM level pots. NOTE: The INPUT
A and B TRIM controls do not affect digital
input. Sampled audio from the S/PDIF digital
Illustration 4.01 - Connecting audio to the US-224