Linear power supply

Small Green Computer 

Sbooster

Zerozone or lhyaudio, both on aliexpress

Pretty sure, adding a LPSU to an Icon before the warranty has expired, voids warranty. The Icon has not been on the market for even a year yet. We have to wait till December. I have a pretty hard time believing that the $100 LPSU would sound the same as an S booster or Teddy Pardo offering. Depending on where you want to go with this set up. One should ask, why am I modifying a midtier audio product when I could be putting that money towards a higher tiered offering. 

Mid-tier?  Wait until you tune into 7:45 of this review by TAS!  Essentially, the host is saying the $35k combo of a $28k DAC and highly raved Aurender N200 here sounds better than ICON but the difference is subtle.

https://www.youtube.com/watch?v=MMpXGuG8DCw&t=141s

Also, other companies may have been working on developing it, but so far, Teddy Pardo seems to be the first and only vendor offering an LPS mod for the ICON.
 

+1 Small Green Computer!