Thats because all your Chords are transformer coupled(ACSS works without transfomer coupled dacs).I've had a few of the DI units here over the years, and the main issue was that the ACSS S/PDIF out only seemed to work with Audio-gd DACs. If I were to buy one myself, simply because of the variety of DACs I have here, I'd ask that to be made a regular S/PDIF output.
Example
Ideon Ayazi works fine from DI20HE/ACSS
Also the regular SPDIF/RCA output on DI20HE works fine with all dacs I have tried especially: Chord TT2(+10Mhz DI20HE), it was like a mscaler experience in sound upgrade for me, just more lifelike, more texture and separations.
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EDIT: Currawong has corrected me on this, I did not use the whole explaination why it may not work on Chord dacs, and I made an specific assumption that was wrong, but please keep reading further down in the thread for a more "detailed" information from the manual of DI20HE...
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