Rega DAC-R Digital Analogue Converter

The Rega DAC-R is a 16/20/24-bit at 32kHz to 192kHz digital to analogue converter. Incorporating an enhanced version of the Rega designed circuit, the DAC-R offers the highest possible resolution over all inputs including fully asynchronous USB with the addition of remote functionality.
Developed to be simple to set up and use, the Rega DAC-R is designed to optimise performance from any two channel PCM digital audio source.
With the PC now widely accepted as a credible medium for storing and streaming music, the use of high quality lossless files such as WAV, FLAC and ALAC offer performance through the DAC-R equal to and in some cases better than Red Book CD. Great care has been taken to remove noise generated by the PC and other input sources. (During development this was identified as a major drawback with many DAC’s on the market today).
The DAC-R is housed in a custom aluminium and steel case and boasts a pair of Wolfson DAC IC’s, three user selectable digital filters and one isolated asynchronous USB, two isolated Co-axial inputs & two TOSlink SPDIF inputs.
The DAC-R has been designed and engineered to integrate perfectly into any system and achieve the highest performance in its class.
The optical and coaxial input stage comprises a Wolfson digital receiver with a high stability, low jitter clock driving the receiver PLL. The receiver and PLL have their own dedicated power supplies. The DAC stage comprises a pair of parallel-connected Wolfson WM8742 DAC’s, that are driven via a buffer stage, which ensures the integrity of the data being fed to the DAC IC’s similar to the arrangement used in the Isis reference CDP.
The USB input stage is comprised of a bit perfect XMOS USB Audio 2.0 with asynchronous clocking. The USB input stage feeds the Optical and Coaxial input stage via an isolating transformer giving total isolation from the host computer.
The output amplifier employs a discrete differential, multiple feedback filter and output amplifier, with a high cut-off frequency for use with higher sample rates. We decided not to use a sample rate converter and process the data at the incoming sample rate which keeps the signal processing to a minimum. Jitter was minimised by synchronously clocking the digital data with our receiver PLL (removing any jitter from the input signal).
All the capacitors associated with the analogue signal path are audio grade bypassed with MMK polyester capacitors, and low impedance conductive polymer capacitors are used for DAC decoupling. The power supply utilizes a toroidal transformer, fast rectifier diodes and again audio grade capacitors. There is a power supply for the control micro controller, separate from the digital & analogue audio stages. Special attention being paid to the inter IC control signals ensures the control data noise is kept to a minimum.

DAC: 2 x Wolfson WM8742
Frequency Response (100 kΩ load) Filter 1 selected
Low data rate: 44.1/48 kHz = 10 Hz - 0.05 dB to (44.1 k) 20.02 kHz (48 k) 21.7 kHz - 0.03 dB
Medium data rate: 88.2/96 kHz = 10 Hz - 0.05 dB to (88.1 k) 28.7 kHz (96 k) 31.2 kHz - 3 dB
High data rate: 176.4/192 kHz = 10 Hz - 0.05 dB to (176.4 k) 44.1 kHz (192 k) 47.7 kHz - 3 dB
Maximum output level: 2.175 V into 100 kΩ load
Bit resolution (all inputs): 16 to 24-bit
Supported data rates: 32, 44.1, 48, 88.2, 96, 176.4, 192 kHz
Total Harmonic Distortion all inputs (24-bit 96 kHz): 0.006% @ 1 kHz
Signal to Noise Ratio: - 105 dB
Digital inputs:
USB Asynchronous Isolated (24-bit 44.1/48/88.2/96/176.4/192 kHz)
Input 1 & 2 Optical/TOSlink (24- bit 32/44.1/48/88.2/96/176.4/192 kHz)
Input 3 & 4 Isolated 75 Ω Co-axial (24-bit 32/44.1/48/88.2/96/176.4/192 kHz)
Digital SPDIF outputs (via receiver & PLL)
Optical/TOSlink
Isolated 75 Ω Co-axial
Power: 230 V/115 V/7.6 W
Dimensions: 215 (W) x 320 (D) x 80 (H) mm
Weight: 4.0 kg

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