Teac UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black)

Teac UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black)

Teac UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black)

B&H # TEUD503B MFR # UD-503-B
Teac UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black)

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Product Highlights

  • 2-Channel, High-Resolution D/A Converter
  • Supports PCM Sample Rates up to 382 kHz
  • Supports DSD Sample Rates up to 11.2 MHz
  • Dual-Mono Design Eliminates Crosstalk
  • USB, Coaxial, and Optical Digital Inputs
  • XLR and RCA Analog Outputs
  • 10 MHz External Clock Input
  • 2 x Front-Panel 1/4" Headphone Jacks
  • Selectable and Adjustable Output Level
  • Supports Asynchronous USB Mode
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Teac UD-503 overview

  • 1Description

The black Teac UD-503-B is a dual-monaural USB DAC designed to provide premium audio reproduction in the highest PCM and DSD sample rates for audiophiles and music connoisseurs in listening rooms, home audio setups, and studios. Its dual-mono design uses separate converters and amplifiers for the left and right channels to eliminate crosstalk between channels.

High-resolution VERITA converters support PCM audio up to 32-bit / 382 kHz resolution and DSD audio up to 1-bit / 11.2 MHz resolution. Digital signals can be sourced from coaxial, optical, or USB inputs. When streaming via USB, the UD-503-B allows jitter-reducing asynchronous transmission, which uses the internal clock to adjust and stabilize the timing of the input signal. A BNC input allows the connection of an external 10 MHz master clock.

Balanced XLR and unbalanced RCA analog outputs are available on the back panel. Their levels can be set to fixed, variable, or off via a 3-position switch. The two front-panel 1/4” headphone jacks can be used for unbalanced, balanced, or active ground headphone configurations.

VERITA AK4490 DACs utilize VELVET SOUND architecture to provide expressive capability suitable for the playback of high-resolution audio sources that reproduce sound waves outside the range of human hearing. A newly developed low-distortion technology enables signal-to-noise performance of 112 dB. Along with native playback with direct processing of 11.2 MHz DSD signals, support is provided for other high-resolution audio sources, including up to 32-bit / 384 kHz PCM digital input.
Dual-Mono Design
A dual-monaural circuit structure encompasses every aspect of the UD-503-B 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 be used as a high-performance headphone amplifier.
Internal and External Clocking
When connected by USB, rather than synchronizing with a computer clock that is unstable and noisy, the UD-503-B supports asynchronous USB transfer mode, allowing it to control PCM and DSD signals by synchronizing with its own clock generated by its built-in, high-precision crystal oscillator. Two dedicated internal clocks running at 44.1 kHz and 48 kHz are built-in. By applying clock from an audio grade high-precision crystal oscillator, which features low phase noise, to input sample rates that are whole number multiples, the effect of jitter on audio quality can be largely suppressed and the audio source can be reproduced faithfully. The 10 MHz external master clock input (via BNC) allows synchronization with master clock signals of even higher precision.
DSD Up-Conversion
Using an FPGA (programmable IC), up-conversion is supported at 2x, 4x, and 8x PCM and up to 12.2 MHz DSD. You can up-convert 16-bit / 44.1 kHz audio files ripped from CDs up to 11.2 MHz DSD format files. 48 kHz PCM audio files can be played back in 12.2 MHz DSD format.
Selectable Filters
In addition to four types of PCM digital filters and an OFF mode, the unit has two types of DSD digital filters, so you can choose the best filter for the input file format and type of music. When receiving signals at 352.8 kHz or 384 kHz, the digital filter will be disabled during playback regardless of this setting.
Enhanced Isolation
Between the digital and analog sections, the circuit design uses a digital isolator to completely isolate both the power supply and the ground. So, all noise coming from digital input sources, starting with noise from the computer via USB, is prevented from entering the analog section by way of the power line or the ground. An isolation circuit offers significant benefit particularly when playing high-resolution audio sources with high sampling rates.
High-Capacity Power Transformers
Both left and right channels each have one dedicated, high-capacity, toroidal-core power transformer that supplies stable current. This is also a continuation of the dual-monaural design and enables the stable supply of current to each channel without being influenced by the changes in current consumption due to processing of the other channel's signal.
Four-Circuit Structure
One pair of balanced XLR outputs and one pair of unbalanced RCA outputs are included and can be set to either an adjustable or a fixed volume level, allowing a simple system to be put together in combination with a power amplifier or active speakers. The preamp circuit utilizes the TEAC-QVCS (Quad Volume Control System), which is a circuit that uses balanced processing of the audio signal at every stage from immediately after conversion from digital to analog until it reaches the volume amplifier. Control signals transmitted from the volume knob simultaneously adjust the variable gain amp type volume controls for a total of four independent circuits—positive and negative for both of the left and right channels. Using this system, the unnecessary manipulation of audio signals is eliminated, and the left/right and positive/negative independence of the audio signals is preserved, achieving clear sound quality with outstanding channel separation. This does not apply when using the unbalanced analog inputs.
Precision Volume Adjustment
The volume control system realizes 256 steps of volume adjustment in 0.5 dB increments over the complete range from -95 dB to +24 dB. Precise volume adjustment has been made possible using a remote control, which is difficult using motorized analog volume. In addition, optimal volume levels can be achieved for headphone listening using headphones with various levels of efficiency. The display has an adjustable dimmer and provides high contrast and excellent visibility. The large font enables listeners to check the volume even from distant positions.
Selectable Headphone Output Format
On the front of the UD-503-B, two 3-pole TRS (standard stereo) jacks are provided as headphone outputs. These can be switched between three types of drive operation. In addition to connecting balanced drive headphones, you can also use unbalanced drive to connect two pairs of ordinary headphones, as well as use active ground drive, which can further decrease noise during silences and enhance the expressiveness of delicate sounds.
Metal Construction
The construction of the entire body from metal panels that are effective against external noise suppresses the penetration of electromagnetic noise emitted by computers and other devices. This realizes a clean internal environment with low noise even when the surroundings are hostile to audio equipment. The metal chassis is also wrapped from both sides with 8mm-thick aluminum panels, and a center beam connects the front and rear of the chassis. These features prevent twisting and bending to create a strong and stable body.
Easy Installation
The three-point support method used for the legs enables stable body installation without influence from even the slightest surface irregularities. An original structure that unifies a spike-shaped foot with a mortar-shaped stand is used for each leg. Vibrations and resonance are reduced by supporting the body of the unit on pinpoints. This thoroughly eliminates mid- and low-frequency murkiness and realizes improved resolution, which brings out the details of sounds and sound placement.
In the Box
Teac UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black)
  • Remote Control
  • 2 x AAA Batteries
  • RCA Female to 3.5mm Male Cable
  • Power Cord
  • 3 x Cushions for Feet
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Teac UD-503 specs

    D/A Converter
    Model Verita AK4490
    Conversion Up-Conversion (off, x2, x4, or x8): up to 384 kHz (PCM) or 12.2 MHz (DSD)
    DSD Cut-Off Frequency: 50 kHz, 150 kHz
    PCM Digital Filter: FIR sharp, FIR slow, short-delay sharp, short-delay slow
    External Clock 1 x BNC (10 MHz external clock input)
    Digital Audio Inputs
    Connectors 1 x S/PDIF RCA coaxial (0.5 V p-p, 75 Ohms)
    1 x TOSLINK optical (-24 to -14.5 dBm peak)
    1 x 1/8" (3.5 mm) mini-jack (supports optical)
    1 x USB Type-B (USB 2.0, supports asynchronous mode)
    Sampling Frequency DSD (via USB): 2.8, 5.6, and 11.2 MHz
    DSD (via coaxial and optical): 2.8 MHz
    PCM (via USB): 32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, and 384 kHz
    PCM (via coaxial and optical): 32, 44.1, 48, 88.2, 96, 176.4, and 192 kHz
    Bit Rate 16, 24, and 32-bit (32-bit only via USB)
    Analog Audio Inputs
    Connectors 2 x RCA coaxial jacks (one L/R pair)
    Input Impedance 51 kOhms
    Sensitivity 130 mV
    Analog Audio Outputs
    Jacks 2 x XLR 3-pin jacks
    2 x RCA coaxial jacks (one L/R pair)
    Output Impedance XLR: 188 Ohms
    RCA: 150 Ohms
    Maximum Output Level Fixed (0 dB): 2 Vrms
    Fixed (+6 dB): 4 Vrms
    Variable: 12 Vrms (XLR), 6 Vrms (RCA)
    Frequency Response 5 Hz to 80 KHz (+1dB/-3dB)
    SNR Balanced: 112 dB (A-weighted, 1 kHz)
    Unbalanced: 110 dB (A-weighted, 1 kHz)
    THD 0.0015%
    Headphone Output
    Connector 1/4" (6.3 mm) stereo phone jack
    Formats Balanced
    Active ground
    Maximum Output Balanced: 700 mW + 700 mW (32 Ohms load, THD 1%)
    Unbalanced: 500 mW + 500 mW (32 Ohms x 1 loaded, THD 1%)
    Unbalanced: 350 mW + 350 mW (32 Ohms x 2 loaded, THD 1%)
    Nominal Impedance 16 to 600 Ohms
    Power Supply USA/Canada: 120 VAC, 60 Hz
    UK/Europe: 230 VAC, 50 Hz
    Power Consumption 16 W (0.4 W in standby)
    Computer Requirements Windows (32/64-bit) 7, 8, 8.1 , and 10
    Mac OS X Lion (10.7), Mountain Lion (10.8), Mavericks (10.9), Yosemite (10.10), El Capitan (10.11.1), or Sierra (10.12)
    Construction Material Metal
    Dimensions (W x H x D) 11.4 x 3.2 x 9.8" / 290 x 81.2 x 248.7 mm (including protrusions)
    Weight 9.3 lb / 4.2 kg
    Packaging Info
    Package Weight 12.25 lb
    Box Dimensions (LxWxH) 17.2 x 13.8 x 7.5"

    Teac UD-503 reviews

    UD-503-B Dual-Monaural USB DAC with Balanced Headphone Amplifier (Black) is rated 4.0 out of 5 by 1.
    Rated 4 out of 5 by from nice and compact Very well built preamp. It is limited in input connections but will definitely suffice as a computer amp.
    Date published: 2018-09-17
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