The coloration of the music customized to your liking is what it’s all about in my opinion. That’s what interconnects, speaker cables, power cords, tube rolling, etc does. With or without a preamp of your choice depending on what sound you like best. No one answer is universal.
Is Pre-Amp needed
Is a preamp needed. I run my oppo 205 direct to an MC275-6 for two channel audio and it sounds good, but am wondering how much better a pre-amp would make it sound. A pre-amp seems necessary for multiple sources, but not for just one source. Would it just be an extra link in the chain or would it greatly improve the sound?