I placed a Perfect Path Tech (PPT) Omega mat and some of the cards on the Lumin X1 and on the external power supply. I placed them on it from the day I received the X1.
I noticed that I was getting a upper/mid high frequency glare and limited lower bass response, but I thought it was due for the need of more break in time.
Today, I removed the PPT Omega mat and the cards from the X1 and to my surprise the sound quality blossomed and became much more enjoyable and smooth.
Come to think of it I also did not place a PPT Omega mat under my former streamer- Bryston BDP-2.
So, since the X1 also contains a dac with lundal transformers it seems that what ever the PPT Omega mat / cards are made of, it conflicts with the Lumin X1.
ozzy