While I’m not familiar with the Classe gear, or their house sound, I did buy the PS Audio Stellar stack for a system in a vacation home. I have say I’m really impressed all around - amp/preamp and DAC. I was skeptical because of others general comments about class D topology. I needn’t have worried. They are smooth and very musical. On a performance spectrum, I’m very happy, and thrilled when I factor in value. I own significantly more expensive gear in another system. I’m not sure it’s better. A couple of caveats. 1) I’ve never owned ML speakers and I gather that driving them might offer some strange loads. I don’t know how the Stellar stack will work with them, though intuitively, I would think pretty well. 2) The Stellar stack needs to be broken in. Not sure where you fall on that debate, but I’m now a believer as the gear has gotten significantly better from when I first hooked it up, though it was pretty good out of the box.
PS Audio has a very generous, no questions asked return policy, but don’t return it without giving it at least 100 hours. I suspect you’ll be glad with the purchase if you do.