Single ended vs. XLR Connection Advise Needed

There is more sonic difference's between XLR vs RCA, take for example the single box CD/Players with Digitial or Analog Volume, The out-put on the single ended out of the units use (in most cases) 1 dac per channel where as the balanced outs (if they have it) use 2-6. In the case of preamps, most preamps have a higher voltage output with XLR vs RCA, witch in turn giveing you a higher gain at lower volumes. I have a balanced & single ended preamp that in balanced gives out 4x12db gain and in single mode only gives out 2X6db. I am a XLR guy, Its dead quiet and hassle free when I am doing any cable switching, those locking WBT's can be a pain in the A#$, if you know what I mean.

Caes in point. The Theta Miles ballanced version was far more better then the single ended, this had to do with the 2 dacs per channel out on the XLR path

True of course, but according to Hgeifman's post, that is not the point here IMHO.

In my experience, balanced IC's gain a progressive advantage over SE's as the length of run increases. This makes intuitive sense, since longer runs are more susceptable to RF interference, etc. At runs of 1-2m in a quality system, differences can be very subtle.

If your equipment have both outs/ins XLR and RCA more-likely it's not balanced. The true-balanced equipment has only balanced outs and that where it makse the point and sence. There has to be an output transformer present that separates positive and negative signals onto different signal wires. If you open up the cover you will realize whether the equipment balanced or not.
I always prefere the equipment that has either one of... instead of having both.