I'll keep this short, because they are far from burned in. After nudging repeatedly, Grover sent me his latest offering. I will respect his wishes to call it the"enhanced" version of the SX series of Rca's. In all I have had 6 generations of his cables, since the original group buy here on AN. Call me stubborn, curious and cunning...since every upgrade costs only 50$ and Grover is obviously talented and obsessive in his persuit of improvement, this fits my profile and my budget. In addition, I found the SX series to be a big step up the ladder from the previous and this will be the the third re-think. I call it the SXc, to keep them in order. Grover prefers to not talk about what constitutes the difference and I agreed to respect that. It's obviously internal, since they look the same. I'll leave you to imagine...at this point I am being cautious since I am known to be over-enthusiastic and then regret it. What is sure is that the treble is absolutely stellar. I am waiting for the bass to flesh out and the mids to settle and round out. Spacially and tonally these are truely excellent and in my HO, a big step upwards. I have to admit to being fed up listening to cables burning in and I wish sometimes I wasn't so neurotic and always looking ways to improve. At least I'm not alone.
More will be revealed.