Thanks for the advice, you are right on both counts.Sigh. I'm about to give up. The original DAC vastly outperforms 16 bit audio.
And the main reason you'll likely not notice the difference is because your speakers and headphones have a much poorer SINAD number than the DAC.
In any case, this reviewed DAC is cheap, so if you sell the DX3 pro and update to this it likely will not do harm to you financially. Your choice.