... I thought of one more idea for the
Ultra Sonic-Supremo based on the Roadmap work regarding dual subwoofer calibration:
Dual subwooofer outputs.
Original thoughts below from Roadmap forum; sorry for the redundant, repetitive, reiterative context.
Balanced outputs (go big with nice XLRs);
High-quality, outboard power supply;
Dual ESS chips;
Analog, resistor-ladder volume control, so we don't lose bit depth at lower volumes;
Decoding for Ultra-hi res formats - DSD512, PCM 768kHz, and MQA(?);
Retain Phono in;
Connector for external Wi-Fi antenna;
Appropriately Larger screen (!)

;
...
And how about that catchy name (Ultra++, Ultra Sonic Supremo, Ultra Pinnacle, Ultra Apex, or Ultra Ultima...)? Sonics first but help me out with a fun name here.
I love all the ideas in the roadmap even though I may not use some. Choice! Sincere thanks, again, to the WiiM team for their dedication, kindness, responsiveness, and patience!!! Brave souls.