The DAC is under test, it plays up to DSD128 with 5/6 MHz oscillators, up to DSD256 with 11/12 MHz oscillators and maybe DSD512 with 22/24 MHz oscillators (to be tested).
The FIFO Lite also accepts DoP.
After the test there will be a listening section to compare the TWSDAC-DSD with the DAC Lite.