Did he use it via the 4-pin XLR or the speaker outputs?
I was going to plug my SRD-7 Pro into the speaker out, and plug my K1000 pigtail into the back of the SRD-7 Pro - then switch between Stats or K1000 on the loudspeaker setting. Craig said the amp is a lower gain amp, and unless the source/DAC had a high output that it might not power the K1000 very well via the 4-pin XLR.
I also plan to use the ZDT 4-pin out with my woodied re-cabled D2000 and HD600, and the 1/4" SE jack for my RS-1, AKG K240M, ATH-ESW10 and HFI-700 among others. So, I can listen to my balanced dynamics, SE dynamics, stats and K1000 with one amp. If it doesn't do the trick for me I would possibly sell it, and then look at a Beta 22 with speaker out, but I prefer tubes. OTOH, if it is good enough I might get rid of the Square Wave XL instead.