The DAC utilizes Wolfson's digital receiver with its own power supply feeding a pair of Wolfson WM8742 DAC in parallel, which are driven via a buffer stage. 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. No 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 a phase lock loop.
There are 5 user-selectable digital filter, which are:
Linear phase soft-knee filter
- Minimum phase soft-knee filter
- Linear phase brickwall filter
- Minimum phase apodising filter
- Linear phase apodising filter
All the capacitors associated with the analogue signal path are Nichicon FG 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 Nichicon FG capacitors. There is a power supply for the control microcontroller, separate from the digital & analogue audio stages. Special attention being paid to the inter IC control signals ensuring the control data noise is kept to a minimum
Features
- up to 24-bit 192kHz
- Five user selectable digital filters
- Two isolated coaxial inputs, two Toslink S/PDIF inputs, one isolated USB input
- A pair of parallel-connected Wolfson WM8742 DAC's, which are driven via a buffer stage, a similar configuration to that used in the Isis CD player
- Output amplifier with a discrete differential multiple feedback filter and output amplifier
- Housed in a brand new custom steel & aluminium case
