I haven't taken the time to read all posts/links. But if the question is to use either dual cables from Preamp output OR a splitter from one channel I would put my money on the dual set of cables being superior.
My advice; avoid splitters as often as possible. I have used some good ones by Audioquest and Cardas, and they still do lots of damage to the signal. I have used the dual outputs of the VAC Signature Preamplifier MkII to great effect (reviewed for Dagogo.com).
Doubling cabling typically results in wonderful improvement. Splitters usually result in serious degradation. You have been warned! :)
My advice; avoid splitters as often as possible. I have used some good ones by Audioquest and Cardas, and they still do lots of damage to the signal. I have used the dual outputs of the VAC Signature Preamplifier MkII to great effect (reviewed for Dagogo.com).
Doubling cabling typically results in wonderful improvement. Splitters usually result in serious degradation. You have been warned! :)