When you are using DSD-Direct-to-Analog Conversion, either in the OPPO itself or by passing HDMI DSD to an AVR which offers that, one of the audio processing steps you lose is Speaker Distance compensation. That could account for what you are hearing.
Set SACD Output PCM, and recheck your speaker configuration settings including distance and levels. Check levels with tracks 43-48 from "Stay in Tune with PentaTone", SACD. Then see if you still feel the Center is wrong.
While you are at it, double-check speaker wiring polarity to be sure you have all speakers the same. Screwing that up will introduce phase errors. You can test that with a calibration disc as well such as AIX Audio Calibration, Blu-ray.
Once you've got DSD via PCM dialed only THEN try DSD direct and see if it still sounds better after the loss of audio processing like speaker distance compensation.
For DSD direct you need a vanilla speaker setup -- at least 5.1 speakers set equidistant and matched in output. In addition, these all need to be Full Range speakers as you can't get Crossover processing either.
Last edited by Bob Pariseau; Yesterday at 06:58 AM.