I think you'll find the Y in DIY, ultimately, refers to you. When you are reliant on the kindness of strangers making demands is not the best way to go. FWIW, the answer can be found in the first link of the first post though you might find the going tough with the thread being six pages long.
I don't know what signal is acceptable FOR YOU.
You know that 1794's output current is 7.8mAp-p. so use Ohm's law to calculate passive I/V resistor.
DC block capacitor - put 1-10uF.
RC filter - F=1/(6.28*C*R), let say 5.2k and 1nF.
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Just because njm358 starts from $0.15, and ne5532 - from $0.55 (Digikey, 1pc.) - the goal was to get "simple and cheap" 😏
output i/v resistors are always installer afaik, an helpful table re. couple capacitor dimensioning:
http://www.dddac.com/pictures/pics1794/output_rc_large.png
I tried i/v resistors output only in the past with dddac pcm1794 (in balanced mode with short wires, no caps, no transformers or no output buffer stage.. no nothing except 4x135ohm i/v resistors) and liked the result with no particular down side I could tell in my system.. if your preamp has input blocking capacitors then It might be worth a try for simplest form?
http://www.dddac.com/pictures/pics1794/output_rc_large.png
I tried i/v resistors output only in the past with dddac pcm1794 (in balanced mode with short wires, no caps, no transformers or no output buffer stage.. no nothing except 4x135ohm i/v resistors) and liked the result with no particular down side I could tell in my system.. if your preamp has input blocking capacitors then It might be worth a try for simplest form?