Originally Posted by Chriscpm
I said that I turned the bi-amp off. The rest of what I wrote was still the case. Celebration Day is probably a 7.1 disc I guess. Any 7.1 setup is just a mess basically. I'm not sure how you know the bi-amp repurposes the rears though. Its a good guess, but I don't see any docs. it seemed to mess up everything a lot more than that.
Not sure why a preamp needs a biamp mode, but from page 25 of the manual:
"BI-AMP: when Bi-Amping is enabled, the rear surround outputs on the UMC-200 output a
duplicate of the signal on the front (main) outputs. (In a system where the front speakers are
“vertically bi-amped”, the upper and lower frequency sections of each front speaker receive
the same audio signal, but delivered by a separate amplifier channel. This may improve the
audio quality. Bi-Amping requires a speaker which offers “bi-amp” connections, and another
pair of amplifier channels.)"
About the 5.1 being converted to 7.1, there is a similar issue with the newer Denon receivers. The default setting, which can no longer be changed, is to automatically upconvert all 5.1 DTS / DTS-HD to 7.1. Maybe the UMC does the same. See here:
Originally Posted by jdsmoothie
This was a feature implemented in the XX12 models as the default setting under the "Surround Back" parameter; however, although this parameter was removed from the XX13 models and 4520CI, the default apparently still remains. If you prefer to turn this feature off, you can likely do so using the remote codes for a XX12 unit copied to a Harmony remote.