Pure DSD, Reference all-solid-state Digital to Analog converter with a MOSFET Class A output stage


The DSD-SR is APL Hi-Fi’s Digital to Analog converter, specifically made for those enthusiastic audiophiles who search for a no compromise digital audio reproduction offered by an all-solid-state DAC design.

It is an all-hand-made boutique, designed and built with the best possible audio quality in mind for its price-range.

Just like the DSD-MR reference converter, the DSD-SR is inspired by vinyl sound quality, and it provides a comparable rich and spacious sonic character.

From the double DSD processing rate, to the MOSFET Class A output stage, the DSD-SR offers a high level of technology advancement and refinement.

The DSD-SR is based on a modular design, allowing a cost-effective future upgradability of any internal stage.

Digital Processing

  • Proprietary asynchronous USB input module accepting DSD64 and DSD128, as well as PCM rates up to 384kHz/32bit.
  • Proprietary PCM to DSD converter module with DSD64 and DSD128 capabilities, user selectable from the remote.
  • S/PDIF digital input module accepting up to 192kHz/24bit PCM.
  • All PCM rates from USB and S/PDIF sources are processed to DSD domain, prior to D/A conversion.
  • Pure DSD Digital to Analog conversion module.
  • Paralleled Flagship DAC devices working in DSD only and a special mode we have developed, resulting in much improved audio quality.
  • Ultra-low-jitter Femto Master Clocks.
  • Proprietary DTR input intended for connecting our DTR-MR digital audio transport.

Analog Output Stage

  • Pure Class A, unity-gain Single Ended MOSFET output stage.
  • Unique Hybrid-Attenuator offering a lossless volume control with 0.5dB step, negating the need of a preamplifier, wherever possible.
  • Passive DSD analog filtering and interstage coupling, featuring custom Lundahl audio transformers.
  • Zero Negative Feedback design for the MOSFET output stage.
  • No capacitors on the signal path.
  • No mechanical contacts, relays or switches on the signal path.
  • Solid core Oxygen Free Copper internal signal wiring.

Power Supply

  • Oversized Custom P-Core balanced main power transformer.
  • Optically controlled, mechanical-contacts-free devices for main power switching control.
  • Delayed start for proper warm-up.
  • High grade, specially selected rectifiers and passive components.
  • Solid Copper wiring for power supply.

Convenience and mechanical

  • FLD display with custom selectable Rose, Blue or Green colors. Please specify when ordering.
  • Microprocessor control memorizing last settings, including volume level for each input.
  • Infrared Remote milled from solid Aluminum blocks.
  • All-Aluminum, precision machined enclosure.


  • 2-years warranty with an available 3-year warranty extension, with an online product registration. Please visit http://aplhifi.com/register/

Digital Inputs

  • Two S/PDIF Coaxial digital inputs with WBT RCA connectors.
  • AES/EBU professional standard balanced digital input.
  • Note! S/PDIF, AES/EBU and Optical accepting up to 192kHz/24bit PCM.
  • USB input accepting up to 384kHz/32bit PCM, as well as DSD64 and DSD128.
  • All PCM rates from S/PDIF, AES, Optical and USB are converted to DSD64 or DSD128, user selectable from the remote.
  • Proprietary DTR input connection with our DTR-MR digital transport.

Analog Outputs

  • Single Ended RCA outputs with WBT RCA connectors.
  • Output level – 2.1V RMS at 0dBFS.
  • Output impedance – approximately 15 Ohms.

Power input and fuses

  • IEC power inlet made by Furutech.
  • 120V or 230V / 50-60Hz, factory pre-set.
  • Other power input voltages available on request.
  • 0.1A fuse for standby power.
  • 1A special Gold fuse by AMR for main power.

Dimensions and weight

  • W435 x H80 x D280 millimeters.
  • Front panel width – 450 millimeters.
  • Height with feet – 110 millimeters.
  • 12kg unpacked.

Included Accessories

  • Special power cable of our design.
  • Infrared Remote Control machined from solid aluminum.
  • User Manual.

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