So, I got a little surprise in the mail Saturday, but my son read the label out loud to me wrong and I didn't open it till today, thinking it was something else.
So, now I'm burning in the amp with the TWag cable and JH13Pro, instead of with a balanced HD600, and I can ship Ray his loaner balanced adapter by the end of the week (I needed it to test a loaner Equinox HD600 cable that uses dual three pin XLR on my Protector, since my Sq Wave XL PSU is being repaired and my other amps use 4-pin XLR).
The JH13Pro do sound a little better balanced than single ended, but the Protector still did a very good job with the stock JH13Pro cable. I have about 72 hours on the Protector, and about 1 hour on the TWag cable now. I've had cable like this that have needed 80-100 hours to settle down (APS V3 and ALO SXC for example), so I want to put 3 days of music thru the TWag now.
The LACK of digital volume control is NOT appearing to be a problem at all, as I have NO channel imbalance at extremely low volumes with my Protector. Ray uses the SR-71A volume control, and modifies it to fit in the Protector. This is a very good volume control, and takes 15 minutes to modify each one by hand.
So far I do not regret that I sold my Predator for the Protector. I have many DAC's to feed the Protector that sound great with it, including DACport, Pico DAC, D4, D10, and uDAC and more.