Reasonably-Priced Linear Power Supply for WIMM Pro Plus Streamer

I just received my WIIM Pro Plus streamer for my second system, which is most often played at a low or moderate volume level..  Set up was prompt and simple, using my iPad zero for set-up and operation.  It feeds music to my Rega Brio integrated amplifier and Paradigm Premiere 200b bookshelf speakers.  The sound is excellent,  it I wonder if going from ehat appears to be a phone charger wall wart (USB-C) to a linear power supply would make an improvement in the sound quality and what options there might be, not to exceed the roughly $200 price of the Pro Plus.  BTW, although both the Pro Plus and  the Brio have internal DACs, I am using a Schiit Modi 3+ DAC in the system.  I will do a comparison of the three DACs to see if there is a significant difference in sound quality.  If not, I can simplify things by using one of the internal DACs.