"...the Wolfson Hi-End grade chips WM8740. Supports up to 192KHz/24Bit D/A conversion. Sounds a bit tubelike and soft/warm...."
"...The Burr Brown DAC used in the earlier models has been replaced by the remarkable WM8740 multi bit sigma delta DAC from Wolfson Microelectronics, which has the lowest noise and distortion figures we have ever seen. This 24-bit, 192kHz capable DAC is also used in Arcam's DVD players and top of the line FMJ..."
"...Wolfson Microelectronics today announced that Onkyo has selected the Wolfson WM8740 stereo DAC for use in its new range of high end CD players and AV receivers. Wolfson’s high performance DAC provides Onkyo’s customers with excellent audio performance in the C-777, DTX-10, TX-NA1000 and C-1VL systems. ..."