Now that I had a chance to listen to more CDs through the Surround Master, I have noticed an issue. In the 4 speaker configuration, no center speaker, the vocals are too low in the mix. In the 5 speaker configuration, the vocals are mainly coming from the center speaker. The problem is the center channel is notably louder than the right and left channel. To my ears, the 5.1 configuration sounds better than the 4.1 configuration. The vocal presence is quite diminished in the 4.1 configuration. In the 5.1 configuration, the vocal presence is there, but the channel level is too high. I’m tempted to install a 3dB in-line attenuator on the center channel. I would appreciate any advice.