CAVEAT....
If you are using the Teddy DAC....do NOT (as I did initially) plumb everything in with cheapo Amazon Basics optical or coax cables. After the extended run in I sometimes felt the overall sound sounded a tad 'sat on' and softening the leading edge that can grip ones attention.
So today I got some second hand decent cables... A 1m Audio Magic Illusion QL coax ( probably sold for about a kilobuck new) and a 1.5m run of Audioquest Vodka optical (circa $300 new). I had a brief initial listen to each and compared to the Amazon Basic cables there is a significant improvement. And I mean SIGNIFICANT!
Right now I'm listening to the Audioquest optical that is used between the TV and the DAC. Even though this is just a downloaded compressed BR rip of the brilliant Classical Destinations series from 2008, the tonalities of the instruments are much, much richer and sonorous, and Simon Callows narrative floats in the air with greatly improved articulation. My mother who watches this series with me commented on how much easier it was to follow his speech which in places is rushed...and if some 80+ year old ears can pick that up, it is not a trivial improvement.
Similar improvements were immediately obvious with the coax too that joins the SBT/linear PS to the Teddy DAC.
Yes it is easy to spend as much as the DAC cost on cabling but the results are splendid. I would say my initial impressions give maybe a 30+% improvement. At least.
Many DACs may be relatively insensitive to the digital wiring, but the Teddy DAC certainly is not among those. If you use aTeddydac you really owe it to yourself at least trying a decent cable. I got a great price on mine and could easily resell them for what I paid...but I won't!