TEAC UD-503 DAC/Ampsearch



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An Analog-Sounding DAC/Amp That Does It All

Winner of Japan’s prestigious Visual Grand Prix Gold Award, the TEAC UD-503 is ready to be the centerpiece of your audio system. This dual-monaural USB DAC supports 11.2MHz DSD with a built-in fully balanced/parallel-unbalanced headphone amp. An all-in-one unit, it can function as a preamp to studio monitors and drive balanced headphones with the two TRS outputs on the front panel. It offers a variety of input and output options, and can be controlled with the included remote. The UD-503 utilizes dual high-performance Verita AK4490 DACs, which feature a newly developed low-distortion technology that enables a signal-to-noise ratio of 112 dB—arguably the best in the industry. 

Note: At checkout, choose black or silver. Quantities are limited to 5 units and 3 units, respectively.

The Reviews Are In

One Head-Fi reviewer calls the UD-503 “a hugely underrated DAC with a great headphone amp to boot…It offers complete balanced operation, preamp and headphone amp functionality, a smokin' DAC section, DSD capability, remote control, multiple filter options, and an LCD screen…If you're in the market for a solid-state combo unit for any headphone with low to medium power needs, this guy really should be at the top of your list!” The reviewer goes on to praise the sound: “In a word: analog…It has a fantastically non-fatiguing yet highly detailed sound. There's definitely a little more warmth than 'neutral' but certainly nothing that I'd call flabby, loose, woolly, or syrupy. Just a pleasant tube-like euphony that yields just a hair more slam, midrange richness, and treble sweetness.”


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: 2.8MHz (176.4kHz/24bit DoP transfer)
  • Supported format, PCM: 32k / 44.1k / 48k / 88.2k / 96k / 176.4k /192kHz, 16 / 24bit

Digital Audio Input, 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: 2.8MHz (176.4kHz/24bit DoP transfer)
  • Supported format, PCM: 32k / 44.1k / 48k / 88.2k / 96k / 176.4k /192kHz, 16 / 24bit

Digital Audio Input, USB

  • Connector: USB B type x 1
  • Supported format, DSD: 2.8M / 5.6M / 11.2MHz
  • Supported format, 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: 51 kohms
  • Sensitivity: 130mV

Analog Audio Output

  • Balanced connectors: XLR 3-32 x 1 pair
  • Unbalanced connectors: RCA jack x 1 pair
  • Output impedance, balanced: 188 ohms
  • Output impedance, unbalanced: 150 ohms
  • Maximum output level, fixed (0 dB): 2.0Vrms (XLR/RCA)
  • Maximum output level, fixed (+ 6 dB): 4.0Vrms (XLR/RCA)
  • Maximum output level, variable: 12.0Vrms (XLR), 6Vrms (RCA)
  • Frequency response: 5Hz to 80kHz (+1dB/–3dB)
  • SNR, balanced: 112dB (A-weighted, 1kHz)
  • SNR, 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
  • Polarity, active ground: Tip: HOT, Ring: COLD, Shield: GND
  • Polarity, unbalanced: Tip: L, Ring: R, Shield: GND
  • Maximum output power, balanced: 700mW + 700mW (32ohms loaded, THD 1%)
  • Maximum output power, unbalanced: 500mW + 500mW (32ohms x 1 loaded, THD 1%); 350mW + 350mW (32ohms 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 (32 bit / 64 bit): Windows 7, Windows 8, Windows 8.1, Windows 10
  • Macintosh: OS X Lion (10.7), OS X Mountain Lion (10.8), OS X Mavericks (10.9), OS X Yosemite (10.10), OS X El Capitan (10.11.1), macOS Sierra (10.12)


  • 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


  • RC-1319 remote control
  • 2 AAA batteries
  • RCA-mini plug cable
  • Power cord
  • 3 foot cushions
  • Owner’s manual with warranty card
  • Manufacturer’s 1-year warranty


All orders will be shipped by Massdrop.

Estimated ship date is Sep 25, 2018 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.