Hello,
Be careful a little.
For my specific case, the 2.5 balanced connection between my Onkyo and my Oppo PM3 does not work for a reason I never found out. Am I doing something wrong ?
I use a proper simple strait 4 pin TRRS (R+R-L-L+) cable. There is an obvious phase problem which can be demonstrated by playing a mono file.
Again, I hope what people call "stage" is something else than a phase problem between channels. ??
For now, until I have more time to dig the question, I only use the un-balanced amp. With a short 1-2m cable anyway
Does anyone think the Onkyo and Oppo do not have the same TRRS standard ?
http://blog.mklec.com/trrs-and-trs-plugs-and-sockets-explained/#TRRS-Standards-Differences
One could be CTIA, while the other OMTP. This would explain the out-of-phase issue.