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RE: Lundahl LL1545A, best dac connection

Thanks a lot for the respond, Kevin.

It is true, I forgot to mention what type output is!
It is an SE output, but I would like to have and a balanced too.

Sorry about my ignorance, but I am a newbie at the line audio transformers.

Allready, I have tried the two options that you proposed to me. With a FFT Analyser that I have used, it seems that the L2B/L2U (2:1) has a cleaner capture.

But I have some concern about Zo.
With R4U/L2U (2:1) the resistance output (Zo) for the 234 of direct dac output goes to 364 ohm.
With R2U/L2U (1:1) the resistance output (Zo) for the 234 of direct dac output goes to 536 ohm.
It is normal? This isn't an advantage for Zo of dac?

Additional, at the R2U/L2U (1:1) setup, I had to join the pin10 & pin15 to signal_ground to have cleaner FFT capture.

I hadn't time to explore the balanced output ...


Edits: 10/18/15 10/18/15
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