Non oversampling R2R DAC made in the Netherlands and matches the Ambre. Has I2S connectivity and I've found the I2S connection to sound the best between the Ambre and Onyx.
The Onyx was upgraded to the latest DAC 3 modules and four modules are necessary. Each module has 4 custom in house made R2R DACs bringing the total to 16 DACs. This brings the upgraded Onyx to the same level as the Sonnet Morpheus according to the designer of both DACs.