TEAC USB DAC/Headphone Amplifier

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From £700.00 (FREE UK Delivery)
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Dual-monaural USB DAC that supports 11.2MHz DSD with built-in fully-balanced/parallel-unbalanced headphone amplifier
The UD-503 is a dual-monaural USB DAC and fully-balanced headphone amplifier in a compact body with a footprint the size of a piece of paper. It represents the distillation of TEAC audio design expertise developed for over 60 years with audiophile design concepts.
The same dual-monaural structure, which is an audiophile design concept, as in the UD-501 is used. In addition, two AK4490 DAC chips which are the newest models made by Asahi Kasei Microdevices Corporation, enable native playback of the most advanced 11.2MHz DSD and 384kHz/32-bit PCM formats. Furthermore, analogue output circuits could be called the cornerstone for audio quality, so TEAC have now included four TEAC-HCLD circuits, which are current-enhancing output buffer amps. Operation is fully-balanced when using balanced XLR output and parallel-unbalanced when using unbalanced RCA output. They have realised a DAC section with expressiveness that exceeds the expectations of its class. The headphone amp, which shares the amp section with the line amp, has a discrete structure. Two TRS phone jacks are available on the front panel, and they offer powerful driving force when used as a fully-balanced or parallel-unbalanced headphone amplifier. In addition, the TEAC-QVCS high-precision volume control that provides 256 setting steps and the remote control enable use as a high-quality preamp. The UD-503 is the next generation of USB DAC/headphone amplifier that is leading desktop audio to the next level.
Main functions
  • Two built-in AK4490 DACs made by Asahi Kasei Microdevices support resolutions up to 11.2MHz DSD and 384kHz/32-bit PCM
  • Dual-monaural structure thoroughly separates independent left and right circuits from the power supply to the output stage
  • Built-in preamp circuits are ideal for setting up systems with power amps and active speakers
  • Analog RCA input pair enables use with analog sources
  • In addition to fully-balanced operation, the headphone amplifier supports parallel-unbalanced and active ground headphone operation
  • TEAC's original TEAC-HCLD output buffer circuit, which is a current-enhancing output buffer circuit, conveys the dynamism of music
  • Capable of upconversion up to 12.2MHz DSD and 384kHz PCM
  • TEAC-QVCS high-precision volume control with a four-circuit structure allows 256 setting steps
  • In addition to high-precision internal clocks, 10MHz external clock input is also supported
  • Full-metal body with three independent pinpoint feet realizes high vibration suppression and stability
Technical Specifications:
Supported format
USB input
  • DSD:2.8/5.6/11.2MHz
  • PCM: 16/24/32bit, 32/44.1/48/88.2/96/176.4/192/352.8/384kHz                   
Coaxial input
  • PCM: 16/24bit, 32/44.1/48/88.2/96/176.4/192kHz             
Optical input
  • PCM: 16/24bit, 32/44.1/48/88.2/96/176.4/192kHz             
  • D/A Converter: Asahi Kasei Electronics AK4490 x 2 
  • Up conversion: PCM 384kHz or DSD 11.2MHz at the max. (8Fs, 4Fs, 2Fs,OFF) 
Audio input/output
  • USB input: USB B-type USB2.0, Asynchronous mode transfer 
  • Suggest application: TEAC HR Audio Player (Windows, Macintosh) 
Coaxial input (rear): RCA x1 (Gold plated) 
  • Input level: 0.5Vp-p          
  • Input impedance: 75Ω
Optical input (rear): Optical port (angled type) x1 
  • Input level: -24.0 to -14.5dBm peak
Coaxial input (front): 3.5mm mini x 1 (common use with coaxial input)
  • Input level: 0.5Vp-p
  • Input impedance: 75Ω
Optical input (front): Optical mini x1 (common use with coaxial input)
  • Input level: -24.0 to -14.5dBm peak
Analog input (rear): RCA x1 (Gold plated) 
  • Input impedance: 51kΩ
  • Input sensitivity: 130mV
XLR balanced output: XLR 3-32 x1 (Gold plated) 
  • Output level setting: Fixed (0dB), Fixed (+6dB), Variable, OFF 
  • Maximum output level: 2.0Vrms (1kHz, full-scale, at 10kΩ load, at Fix 0dB set) / 4.0Vrms (1kHz, full-scale, at 10kΩ load, at Fix 6dB set) / 12.0Vrms (1kHz, full-scale, at 10kΩ load, at Variable set) 
  • Output impedance: 188Ω
RCA Unbalanced output: RCA x1 (Gold plated) 
  • Output level setting: Fixed (0dB), Fixed (+6dB), Variable, OFF 
  • Maximum output level: 2.0Vrms (1kHz, full-scale, at 10kΩ load, at Fix 0dB set) / 4.0Vrms (1kHz, full-scale, at 10kΩ load, at Fix 6dB set) / 12.0Vrms (1kHz, full-scale, at 10kΩ load, at Variable set)
  • Output impedance: 150Ω
Headphone output: 6.3mm (1/4") Stereo jack x2 (Gold plated) 
  • Polar (at Balance output): Tip: HOT, Ring: COLD, Sleeve: NC (GND) 
  • Polar (at Unbalance output): Tip: L, Ring: R, Sleeve: GND 
  • Maximum output (at Balance connection): 700mW+700mW (at 32Ω load)
  • Maximum output (at Unbalance connection): 500mW+500mW (at 32Ω x1 load) / 350mW+350mW (at 32Ω x2 load)
  • Supported impedance: 16 - 600Ω
Clock in: BNC port (Gold plated) 
  • Input frequency: 10MHz
  • Input impedance: 50Ω
  • Input level: Rectangle: Corresponding to TTL level 
Up conversion: x8, x4, x2, OFF (Selectable) 
Digital filter 
  • DSD cut-off frequency: 50kHz, 150kHz (Selectable) 
  • PCM digital filter: FIR sharp, FIR slow, short delay/sharp, short delay/slow (Selectable) 
Driver software
  • Windows: Windows 8.1 (32bit, 64bit) / Windows 8 (32bit, 64bit) / Windows 7 (32bit, 64bit)   
  • Macintosh: Yosemite (OS X 10.10) / Mavericks (OS X 10.9) / Mountain Lion (OS X 10.8) / Lion (OS X 10.7)

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