+2 from @mahler123 and @akg_ca-
it’s not that the Oppo is a “bad” device but it’s kind of a “jack of all trades”. I purchased a 105D to run through an AVR and it was cool for movies but not so much for two channel listening. The implementation of the DAC is not that great.
I’ve dumped the AVR and now only use a two channel setup. As my library is all CD (except for a couple SACD) my choice was to go with a Naim Uniti Core for ripping/storage/playback and run that through an external DAC. As of now I’m using an Aqua La Scala Optologic and have been very pleased with the results.