Ok, I installed the Stealth Audio Varidig Sextet v14-T spdif cable on the TPlus clock out last night...
Within the first minute of the song I muttered a curse word (in a good way) and shook my head in amazement. The increase in clarity/detail/soundstage was beautiful and mesmerizing, almost doubling the prior improvement from when I first synced up the clocks between Gaia and TPlus. I don't understand it, but damn, this Stealth cable is terrific- with even more potential improvements once I find the time to get the tuning sleeve in the optimal position.
So, here is the deal- the quality of the clock cable matters. I already knew that after installing my Kimber D60's (my Kimber D60 very much improved the sound versus an inexpensive cable from Amazon and it was very easy to hear and well worth the investment), but the Stealth cable absolutely hammered that idea home.
The TPlus + Gaia combo is just so unbelievably transparent and revealing, the sonic changes from swapping in different cables are simply magnified over what I have experienced with other gear over the years.
To be very clear though, the TPlus and the Gaia sound awesome even with cheap cables and I don't think people should run out and blow the budget on cables.
However, if budget allows and you want to experiment, the TPlus and Gaia scale up amazingly as the cable quality improves (power cables and digital interconnects).