Teac UD-503-B Dual Monaural USB DAC Full Balanced Headphone Amplifier Black

For DAC chips, which are the keys to digital audio, we have used VERITA AK4490 DACs, which are made by Asahi Kasei Microdevices Corporation and have an established reputation for use in high-end audio equipment.* The VELVET SOUND architecture provides the fine expressive capability suitable for the playback of high-resolution audio sources that reproduce sound waves outside the human audible range. Furthermore, a newly developed low distortion technology enables performance of S/ (N+D) = 112 dB. This is the best level in the industry for a 120dB class DAC.

Not only is native playback with direct processing of 11.2MHz DSD signals possible, support is provided for an even greater variety of high-resolution audio sources, including 384kHz/32-bit PCM digital input. We have realized expression of the fine smooth detail and outstanding sense of sound placement that characterize high-resolution audio sources.

Behind the expressiveness of the UD-503, which exceeds the level expected of its class, is an indulgent dual-monaural circuit structure that encompasses every aspect from the power and D/A sections to the analog output stage.

Starting with the toroidal core power transformers, which feature the ability to supply stable current, and the high-performance VERITA AK4490 DACs, the dual-monaural structure has a complete mono circuit for each channel. This prevents the signals from interfering with each other as much as possible. Interference is suppressed between the left and right channels, which is particularly important for headphone listening, so this unit can also be used as a high-performance headphone amplifier.

Key Features

• Color: Black
• USB DAC that supports 11.2MHz DSD and 384kHz/32-bit PCM
• Dual-monaural circuit structure used from the power supply to the digital and analog sections
• Both left and right channels have their own high-end AK4490 DACs, which are made by Asahi Kasei Microdevices Corporation
• Two high-capacity toroidal core power transformersone each for left and right channels
• Isolation circuit that completely separates the digital and analog sections electrically
• 4 TEAC HCLD buffer amplifiers, which are current-enhancing output buffer circuits, are used for the line amplifiers
• Up-conversion to formats up to 12.2MHz DSD and 384kHz/32-bit PCM using an FPGA (programmable IC) that utilizes a fluency function
• Two types of DSD filter and four types of PCM digital filter, as well as an OFF mode
• 10MHz external clock input supported (available during USB asynchronous transmission)
• Two high-precision internal clocksone each dedicated to 44.1kHz and 48kHz signals (available during USB asynchronous transmission)
• One pair of RCA analog unbalanced inputs
• Volume output can be set to fixed, fixed +6dB or variable for the one pair of XLR analog balanced outputs and one pair of RCA analog unbalanced outputs
• XLR jack polarity can be set (2 HOT or 3 HOT)
• TEAC QVCS high-precision volume circuit
• Large digital volume display with excellent visibility and remote control with one-button operation of various functions
• OELD display shows input signal type and various settings (with 3-level dimmer and off functions)
• Fully-balanced drive headphone amplifier with discrete construction and maximum output of 700 mW + 700 mW
• Headphone amplifier can be switched among 3 drive types: unbalanced, balanced and active ground
• Digital inputs on the back include one USB, one coaxial and one optical
• Combined coaxial mini/optical mini digital input connector on front is convenient for digital input from portable devices
• Low power consumption design and automatic power saving function meet modern expectations
• The full-metal body realizes both vibration control and elegant style in an A4-size body that enables placement on a desktop
• TEAC original design for three-point support using pinpoint feet with attached bases
• Compliant with RoHS

Technical Specifications

Digital Audio Input
Coaxial
Connector:
RCA jack x 1
1/8" (3.5mm) Mini jack x 1 (compatible with Optical Input)
Input Level:
0.5 Vp-p
Input Impedance:
75 OHMS
Supported Format:
DSD, PCM
DSD:
2.8MHz (176.4kHz/24bit DoP transfer)
PCM:
32k / 44.1k / 48k / 88.2k / 96k / 176.4k /192kHz, 16 / 24bit
Optical
Connector:
TOS link x 1
1/8" Mini Optical jack x 1 (compatible with Coaxial Input)
Input Level:
-24.0 to -14/5dBm peak
Supported Format:
DSD, PCM
DSD:
2.8MHz (176.4kHz/24bit DoP transfer)
PCM:
32k / 44.1k / 48k / 88.2k / 96k / 176.4k /192kHz, 16 / 24bit
USB
Connector:
USB B type x 1
Supported Format:
DSD, PCM
DSD:
2.8M / 5.6M / 11.2MHz
PCM:
32k / 44.1k / 48k / 88.2k / 96k / 176.4k /192k / 352.8k / 384kHz, 16 / 24 / 32bit
Analog Audio Input
Connector:
RCA jack x 1 pair
Input Impedance:
51k OHMS
Sensitivity:
130mV
Analog Audio Output
Connectors
Balanced:
XLR 3-32 x 1 pair
Unbalanced:
RCA jack x 1 pair
Output Impedance
Balanced:
188 OHMS
Unbalanced:
150 OHMS
Max Output Level
Fixed (0dB):
2.0Vrms (XLR/RCA)
Fixed (+6dB):
4.0Vrms (XLR/RCA)
Variable:
12.0Vrms (XLR), 6Vrms (RCA)
Frequency Response:
5Hz to 80kHz (+1dB/-3dB)
Signal-to-Noise Ratio
Balanced:
112dB (A-weighted, 1kHz)
Unbalanced:
110dB (A-weighted, 1kHz)
Total Harmonic Distortion:
0.0015% (1kHz, LHF: 20Hz to 20kHz)
Headphone Output
Connectors:
1/4" (6.3mm) Stereo jack x 2
Format:
Balanced, Active Ground, Unbalanced
Polarity
Balanced:
Tip: HOT, Ring: COLD, Shield: GND
Active Ground:
Tip: HOT, Ring: COLD, Shield: GND
Unbalanced:
Tip: L, Ring: R, Shield: GND
Max Output Power
Balanced:
700mW + 700mW (32 OHMS loaded, THD 1%)
Unbalanced:
500mW + 500mW (32 OHMS x 1 loaded, THD 1%)
350mW + 350mW (32 OHMS x 2 loaded, THD 1%)
Supported Headphone Impedance:
16 to 600 OHMS
Audio Settings
Up-conversion:
x8, x4, x2, Off
DSD Cut-off Frequency:
50kHz, 150kHz
PCM Digital Filter:
FIR Sharp, FIR Slow, Short-delay Sharp, Short-delay Slow
Line Output:
RCA, XLR (Pin2: HOT), XLR (Pin3:HOT)
Line Output Level:
Fixed (0dB), Fixed (+6dB), Variable, Off
Supported OS
Windows:
Windows 10 (32/64-bit), Windows 8.1 (32/64-bit),
Windows 8 (32/64-bit), Windows 7 (32/64-bit)
Macintosh:
El Capitan (10.11.1), Yosemite (OS X10.10 ), Mavericks (OS X10.9 ),
Mountain Lion (OS X10.8), Lion (OS X10.7 )
Operation Power
US/Canada:
AC 120V, 60Hz
UK/Europe:
AC 230V, 50Hz
Power Consumption:
16 Watts (0.4 Watts at Standby Mode)
Overall Dimensions (including protrusions):
11.4" (W) x 3.2" (H) x 9.8" (D)
290 (W) x 81.2 (H) x 248.7 (D) mm
Weight:
9.3 lbs. / 4.2 kg
Accessories:
Remote control (RC-1319), AAA Batteries x 2, RCA-Mini Plug Cable, Power Cord, Cushion for Foot x 3, Owner's Manual (including Warranty card)