Last update: 2019/1/19
Supplemental to New Product Information (SNPI)
2
Product overview
The UD-301-X is a USB DAC in the Reference 301 range, with a low-profile and small footprint that
comfortably fits into the smallest spaces on desktops.
Supports the playback of DSD128 and PCM 192 kHz /32-bit content from PC/Mac and features an
improved analogue audio stage delivering excellent sound quality to your existing hi-fi system.
In addition, an innovative CCLC headphone amplifier circuit allows you to use the UD-301-X as a
high-grade, standalone headphone amplifier as part of a minimalist desktop system, comprising
which a computer, headphones and the UD-301-X.
Supports DSD Hi-Res audio, and dual-monaural circuit design
Supports DSD128 Native playback
The UD-301-X is equipped with a USB port supporting DSD Native
playback. This directly converts DSD signals into an analogue waveform in
ASIO2.1 and DoP formats, without changing the PCM format. In addition,
asynchronous transfer mode is also supported for accurate data transfer
by referencing the more accurate on-board clock of the AI-301DA-X.
Furthermore, a free TEAC HR Audio Player allows users to play back HiRes files such as DSD128 and PCM192/32 from Windows/Mac without the
need for complicated configuration.
USB streaming supporting asynchronous transfer mode
As digital audio data travels from a computer to the UD-301-X via a USB cable, timing control for
sending/receiving data packets is defined by the UD-301-X’s internal clock which is much more
accurate than that of most computers. This asynchronous transfer mode theoretically eliminates
signal-compromising jitter, and allows digital audio signals to travel in electrically ‘cleaner’ conditions.
Up to 192kHz up-conversion
When handling digital audio signals of 96kHz or less, you are able to up-convert them to double or
quadruple the original signal sampling frequency. Even when playing back a conventional CD (which
is 44.1kHz), a smoother analogue audio signal is obtained by up-converting to a higher sampling
frequency. This up-conversion function can be disabled, according to the user’s preference.
Dual monaural design to eliminate signal interference
In order to process Hi-Res audio data under the best conditions, the UD-301-X
employs a dual monaural circuit design whereby each of the left and right channels
comprises its own single monaural circuit. This circuit design avoids mutual
interference between left and right channels and enables improved stereo
playback.
High-performance BurrBrown PCM1795 32-bit DACs
At the heart of its digital audio section, the UD-301-X uses a pair of 32-bit
processing DACs (digital to analogue converters), namely BurrBrown PCM1795s,