Owner`s manual

Product features
2 channel IN / 2 channel OUT USB soundcard (16 bit, up to 48 kHz (*) sample
rate), compatible with all Windows versions (no driver required), Linux and Macintosh.
High accuracy A/D and D/A converters from Burr-Brown:
(*) The soundcard can operate also at a sample frequency of 96 kHz, but the audio bandwidth
is limited to 22 kHz.
No external power supply required. Powered from USB port.
Very robust anodized aluminum enclosure.
Compact size: 103 x 53 x 120 mm
2 color options: Anodized black or anodized natural
2 x 10 Led VU-Meter bar graphs, for accurate input level adjustment.
Can be used as Preamplifier for Microphone and line levels.
Input and output stages based on state-of-the-art Burr-Brown operational amplifiers
4 inputs, RCA connectors, mixable with stereo input JACK connector. Input 1 and 3
are downmixed to USB input Left. Input 2 and 4 are downmixed to USB input Right.
Suitable for Live recording, using 2 or 4 microphones, and for acoustics
measurements.
Separate switchable phantom power for channels 1/2 and 3/4, optimized for
Panasonic WM6x series electret microphonic capsules (3,6 V).
Input level adjustment realying on high accuracy Cermet potentiometers. Separate
knobs for inputs 1/3 and 2/4.
Separate Preamplifier/Monitor JACK stereo output. It can drive Line/headphone
loads.
USB soundcard stereo JACK/2 x RCA output. It can drive Line/headphone loads.
Line/Microphone input gain switch.
Digital Input / Output, Coaxial and Optical.
Manual selector switch for Coaxial or Optical input (the digital input signal can only
be recorded through USB, it is not buffered to monitor output).
X4 power consumption is 0.75W (all VU meter leds OFF); Peak: 1.75W (all VU
meter leds ON)
X4 Owner's Manual - Rev. 1.4 - page 4