Kijanki, sorry for my delayed return, but I imagine that what Charles is referring to is reflected in the fact that most equipment modders (and I realize that not every single one of them out there is legit, but many are) usually start by swapping the SMPS for a linear (based on sound, again like what Charles is saying). I had always heard that the digital environment under the hood was possibly rather noisy (self noise), but have recently had my eyes opened in my own rig to just how much that may in fact be true. And additionally that these same digital circuits are also it seems much more sensitive to that noise (whatever frequencies of it may be involved) than analog their counterparts...and again I suspect SMPS's may simply create more noise and induce more jitter in their own right. I would like to find favor with SMPS's, they are smaller, cheaper and cooler running, but continue to find IME that linear usually sounds better, sometimes a lot better. But, I do agree, to each his own.