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.
Illustration 4.01 - Connecting audio to the US-224
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
