Advanced Digital Circuits for Hi-resolution Audio Formats
- DSD 2.8/5.6MHz Native File Playback by ASIO 2.1 or DoP
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Both 2.8MHz and 5.6MHz DSD files are processed in native mode to properly convert DSD into an analog signal, and skipping PCM conversion in between.
ASIO2.1 and DoP (DSD over PCM) playback are also supported.
(Mac supports DoP only, with standard driver)
- Up to 32bit/384kHz PCM File Playback
- With PCM file format, files from 44.1kHz/16-bit to 384kHz/32bit resolution are supported.
- Asynchronous Transfer Mode
- Transfer timing is controlled by more accurately by ignoring the clock signal from a PC, nearly eliminating clock-noise and allowing digital data to travel un-affected.
- Variety of Digital Filter Settings and Preferences
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Three types of digital filters are provided for PCM playback, while 4 types of cut-off filters are provided for DSD playback.
Also, shutting down unnecessary circuits – USB circuit when S/PDIF inout is selected, or Line Out circuit when Headphones are connected – for purer audio processing.
- Reducing Jitter Noise by 192kHz Up-Converting
- With a PCM file sampling at a frequency less than 192kHz, users are able to convert up to 192kHz in order to reduce jitter noise, or keep the original sampling rate to enjoy the original sound.
Pure Audio Circuits With Classic Audio Pedigree
- Dual Monaural Circuits to Eliminate Signal Interference and Maximize Performance.
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Every single part of the digital and analog sections are designed in dual monaural design to eliminate interfering noise to other channels. This maximizes the potential of the the DAC and the operational amplifiers, and achieves a purer audio processing signal.
- 32bit-compatible BurrBrown PCM1795 on Each Channel
- The celebrated BurrBrown PCM1795 D/A converter is used on each channel, which supports 32bit audio with a 123dB S/N Ratio.
- Dual MUSES8920 Operational Amplifier on Each Channel
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Two MUSES8920 operational amplifiers are used on each channel. The MUSES8920 was developed for hi-fi components to deliver clear, 3-dimensional sound.
- Individual Toroidal-core Power Transformer on Each Channel – Maintaining Total Dual Monaural Design
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The two toroidal-core power transformers offer a stable current supply with energy-effcient operation. Using a pair of power transformers, one each for the left and right channel, ensures that current is delivered exclusively to each channel.
- RCA Output with Parallel Buffer for Better Drivability
- Two operational amplifiers are connected in parallel with the line out circuit section to improve of line-out signal drive. This helps achieve a more linear analog output signal than any other known method.
High-Standard Hardware Designs for Any Listening Environment
- A full-metal body, small footprint that can be placed on a desktop
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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 conditions. An A4-size body allows the UD-501 to fit any small space. The Reference 501 series defines a new standard to fit all modern interior, with great space-saving design and a timeless presence.
- A Large Number of Inputs & Outputs for Full-Scale Hi-Fi System Integration
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The UD-501 provides two optical and coaxial digital inputs, one pair of XLR and one pair of RCA analog audio outputs. The RCA lineout jacks have an exclusive clearance zone, so a high grade pin cable with a large shell is able to be connected. The output terminal is selectable to either RCA or XLR. The XLR output connectors have switchable polarity, either pin 2 HOT or pin 3 HOT, to accomodate vintage amplifiers. A standard detachable IEC cable with 3-polar socket allows user to upgrade to high-grade AC cables.
