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Rega - DAC-R - DAC



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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. We hope you enjoy this Rega product for many years to come. 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.
Technical Specification DAC 2x Wolfson WM8742 Frequency Response (100KΩ load) Filter 1 selected Low data rate 44.1/48kHz = 10 Hz -0.05dB to (44.1K) 20.02kHz (48K) 21.7kHz -0.03dB Medium data rate 88.2/96kHz = 10 Hz -0.05dB to (88.1K) 28.7kHz (96K) 31.2kHz -3dB High data rate 176.4/192kHz = 10 Hz -0.05dB to (176.4K) 44.1 kHz (192K) 47.7kHz -3dB Maximum output level = 2.175V into 100KΩ load Bit resolution (all inputs) 16 to 24 bit Supported data rates = 32 44.1 48 88.2 96 176.4 192kHz Total Harmonic Distortion all inputs (24 bit 96kHz) = 0.006% @ 1 kHz Signal to Noise Ratio -105dB (relative to maximum output level with a 100Hz to 22kHz bandwidth) Digital inputs USB Asynchronous Isolated (24 bit 44.1/48/88.2/96/176.4/192kHz) Input 1 Optical/Toslink (24 bit 32/44.1/48/88.2/96/176.4/192kHz) Input 2 Optical /Toslink (24 bit 32/44.1/48/88.2/96/176.4/192kHz) Input 3 Isolated 75Ω Co-axial (24 bit 32/44.1/48/88.2/96/176.4/192kHz) Input 4 Isolated 75Ω Co-axial (24bit32/44.1/48/88.2/96/176.4/192kHz) Digital SPDIF outputs (via receiver & PLL) Optical/Toslink Isolated 75Ω Co-axial Power 230v/115v/7.6W Dimensions W 215mm x D 320mm x H 80mm Remote NEC system (6E91) Weight 4.0 Kg

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