Dual Burr Brown DACs: The TEAC UD-501 uses two Burr Brown
1795 DACs for high performance and support of a wide range of digital audio
sources. Its three digital inputs (optical/coaxial/USB) support sampling rates
of 32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and 384kHz. It's ideal for playback of FLAC,
WAV, Apple Lossless, and other high-resolution file formats. The two internal Burr Brown 1795
digital-to-analog converters each work on a single channel (left or right) for
true dual monaural operation. They are capable of 32-bit processing and even have the
capacity to process 2.8/5.6MHz DSD data, for faithful and accurate playback of
high-resolution sound sources.
192kHz Up-Conversion: When handling digital signals of 96kHz and less, you
have the option to up-convert to double or quadruple the original signal
sampling frequency - up to 192kHz. Even when playing back a 44.1kHz sound source
(equivalent to CD sound quality) a smoother analog audio signal can be obtained
in order to convert to a higher resolution digital signal. 44.1kHz input
frequencies can be up-converted to 88.2 or 176.4kHz, 48kHz input frequencies can
be up-converted to 96 or 192kHz, 88.2kHz input frequencies can be up-converted
to 176.4kHz, and 96kHz input frequencies can be up-converted to 192kHz.
Frequencies of 176.4kHz and higher will not be up-converted when input. This
up-conversion feature can be switched on/off, according to your preference and
Dual MUSE Operational Amplifiers: The TEAC UD-501 employs dual MUSE
operational amplifiers to transform the electrical current output of the D/A
converter into a voltage signal. TEAC opted for a dual monaural configuration
for the operational amplifiers, employing two MUSES8920 operational amplifiers,
one on each of the left and right channels. These devices are made by New Japan
Radio and are designed especially for hi-fi audio.
Dual Monaural Design: In order to process the audio signal from a
high-resolution sound source in a purer state, TEAC adopted a dual monaural
circuit design whereby each of the left and right channels comprises its own
single monaural circuit. This avoids mutual interference between the left and
right channels and enables pure stereo playback.
Individual Toroidal Core Power Transformers: The two
toroidal-core power transformers offer a stable current supply with
energy-efficient operation. Using a pair of power transformers, one each for the
left and right channel, ensures that current is delivered exclusively to each
Asynchronous USB Input: The TEAC UD-501 features a USB
(type-B) port for connecting your Windows PC or Mac computer. The UD-501 accepts
digital audio source material stored on your computer at up to 32-bit/384kHz.
When receiving digital audio signals from a computer via USB cable, the unit can
operate in asynchronous mode, controlling the timing of the input signal using
the UD-501's internal clock. With asynchronous transmission over USB, signal
compromising jitter is effectively eliminated, allowing digital audio signals to
be transmitted in a pure, unadulterated state. This allows optimal playback of
high-resolution digital audio files from playlists/libraries in your iTunes,
Windows Media Player, or similar playback programs on your computer.
Note: Compatible with Windows XP (32-bit), Vista
(32/64-bit), and 7 (32/64-bit); Windows
computer will also require the installation of a dedicated
USB driver. Compatible
with Macintosh OS X Snow Leopard (10.6), OS X Lion (10.7), and OS X Mountain
Lion (10.8); no additional driver required for
HR Audio Player App (for Windows & Mac): The
TEAC HR Audio
Player is a free application software download to help you playback and enjoy
your high-resolution audio files on your Windows or Mac computer with ease
through the TEAC UD-501 and your connected home audio system. The TEAC HR Audio
Player allows you to listen to your audio as soon as you connect the TEAC UD-501
and install the application; simply drag-and-drop the music files on your
computer into the window of the application. Various high-resolution audio files
formats are supported, including DSD (2.8MHz/5.6MHz), PCM (44.1-384kHz;
16-32-bit), and FLAC (44.1-384Hz; 16-32-bit), plus compressed music files like
MP3 (32-320kbps). You can even choose between ASIO2.1 and DoP (DSD over PCM)
modes when playing back DSD files from your Windows PC. In order to maximize the
connected unit's performance, a simplified screen of the TEAC HR Audio Player
helps reduce CPU load time while data processing. Furthermore, the RAM
Buffer Playback mode that stores the audio data onto the internal memory is
supported for the ultimate digital audio playback conditions. Additional
features include Playlist, Repeat, and Shuffle playback.
Note: Compatible with Windows XP (32-bit), Vista (32/64-bit), and 7
(32/64-bit). Compatible with Macintosh OS X Lion (10.7) or later.
Optical & Coaxial Digital Inputs: The TEAC UD-501 is fitted with
two optical (toslink) and two coaxial (RCA) digital inputs for connection of other
digital audio sources like your CD/SACD, Blu-ray/DVD player, or network player.
These digital inputs will accept two channel linear PCM (not Dolby Digital/DTS).
The coaxial digital inputs support 32, 44.1, 48, 88.2, 96, 176.4, and 192kHz
sampling frequencies (16- or 24-bit). The optical digital inputs support only
32, 44.1, 48, 88.2, and 96kHz sampling frequencies (16-or 24-bit).
Digital Filters: Three types of digital filters
(Off/Sharp/Slow) are provided for PCM playback, while four types of cut-off
filters (-6.6/+0.3/-1.5/-3.3dB) are provided for DSD playback. You can also shut
down unnecessary circuits, like the USB circuit when the S/PDIF input is
selected or the Line out circuit when Headphones are connected for purer audio
Headphone Amplifier: The TEAC UD-501 features a built-in headphone
amplifier and front-panel 1/4" headphone jack that will accept headphone
impedances from 8 to 600-ohms. The 100mW + 100mW output (at 32-ohms load) headphone amplifier uses CCLC
(Coupling Capacitor Less Circuit) technology. In conventional headphone output
circuits, a capacitor is used for output-stage coupling, and so the sound is
unavoidably colored. When the capacitor is combined with a high-pass filter this
often results in phase lags, or low frequency level degradation. With CCLC the
negative impact of capacitors on sound quality is eliminated, providing full
low-frequency sound and a responsive headphone listening environment with great
Note: In addition to the dual monaural headphone circuits,
there are options to switch off the XLR and RCA outputs. By
cutting the power supply and isolating those circuits that are unrelated to the
headphone output, the performance of the UD-501's headphone output can be
maximized. This feature also makes the headphone amp very easy to use as the
volume control for the headphones is completely separate from the output mode
(Fixed, Adjustable or Off) on the rear panel.
Balanced & Unbalanced Outputs: The TEAC UD-501 DAC is
fitted with both balanced (XLR) and unbalanced (RCA) outputs to connect to a
variety of amplifiers, receivers, and powered speakers.
- Balanced XLR: The TEAC UD-501 is equipped with a
stereo XLR balanced output that can be connected not
only to other domestic hi-fi components, but also to professional audio
equipment. As a highly versatile, high-performance DAC, the UD-501
offers a high-degree of interoperability with devices ranging from those used by
discerning consumers all the way up to those used in the professional domain.
The XLR output connectors have switchable polarity, either pin 2 HOT or pin
3 HOT, to accommodate vintage amplifiers.
- Unbalanced RCA: The UD-501 also contains a stereo RCA unbalanced outputs to connect to most
stereo receivers and integrated amplifiers. The RCA lineout jacks have an
exclusive clearance zone, so a high-grade pin cable with a large shell is
able to be connected. Two operational amplifiers are connected in parallel
with the line out circuit section to improve the line-out signal drive. This
helps achieve a more linear analog output signal than any other known
Note: The XLR balanced output and RCA unbalanced outputs are fixed. If the UD-501 is connected to a power amplifier or an active speaker, the amp or speaker must have its own volume control. The UD-501's front panel volume control adjusts the headphone output only.
All-Metal Chassis: The front, side, and top panels are each
constructed of aluminum and attached to a robust steel chassis. These heavy
parts eliminate vibrations, allowing internal circuits to perform under stable
Organic EL Display: The front-panel Organic EL display indicates
input, music file type, and sampling frequency. The display has four brightness
AC Power: The TEAC UD-501 operates off of standard household current
using the supplied AC power cord. The standard detachable IEC cable with 3-polar
socket allows you to upgrade to a high-grade AC cable (sold separately). Thanks to its auto power save function, the
unit goes into sleep mode after 30 minutes if it has failed to detect a sound
signal. Power consumption in standby mode is 0.1W or less.