Here is more info on the Danville Signal Processing dspNexus 2xN system for audio. A very versatile audio DSP processing system with excellent sound quality.
I am using the prototype dspNexus system now with both the AKM AK4493 and AK4499 DAC boards in the 2x8 configuration and both DACs sound very good indeed. The AKM AK5397 ADC is great for analog sources or for recording things like LP transcription. Full control over the unit is from the front panel with remote control.
And yes, Danville has stock of the AKM parts to build the units.https://danvillesignal.com/dspnexus-dsp-audio-processor