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Are there resistors that connect between legs?Solder 56Ω resistor to AES/EBU connector between pin 1 and 3,
Solder 82Ω resistor to AES/EBU connector between pin 1 and 2,
Solder 120Ω resistor to S/PDIF (RCA) connector between center pin and outer lug,
Solder 130Ω resistor to between AES/EBU connector pin 2 and S/PDIF (RCA) connector center pin,
Solder a wire to AES/EBU connector pin 1 and S/PDIF (RCA) connector outer lug.
Thank you for your help. Figure #1 has two solutions for converting AES3 to 75 ohm - one for AES3id, the other for S/PDIF. Different voltage corrections. My streamer has both AES3 and S/PDIF out. My DAC has only S/PDIF in (RCA).
I built the S/PDIF version. Using a 110 ohm digital cable from an AE3 source, the SQ with the newly built adapter (75 ohm conversion) is much more clean, transparent = crystal clear. Detail, layering and stage are improved. Now, a piano really sounds like a piano. First row - instead of mid-hall. With the simple XLR/RCA adapter (110 ohm pass-through), the tone is basically the same - but has a tube-like bloom. It is quite acceptable.
As a trial, this adapter was built with cheap parts. I plan on building another version using better quality parts in the near future.
AES3id calls for unbalanced 75 ohm connections, which make its hardware requirements the same as S/PDIF connections, though usually AES3id is implemented with BNC connections instead of RCA type connections. While the two formats (AES3 & AES3id) have different hardware transmission methods the data contained within the transmission is identical.