Whoever mentioned it I do think you might be better off plugging class D straight into wall with no filter/ conditioner. At least that was what I found as well.
I dont know much about the technical or engineering arguments but when I listen to mine- Class D definitely has its pluses, and the ones I've used have speed, control, imaging, transparency and detail that is pretty impressive. And you also notice low distortion, what some describe as the sqeaky clean class D sound. Where it can fall a little short is harmonic overtones, I can notice it relative to the tube or class A amps I've had/have but the overall tonality is plenty good enough to me, or more specifically, easier to overlook given its other pluses. Sometimes class D is described as being tube like in sound, I don't think so, at least not in a classic tube sound sense; mine and others I've heard don't have the tonal density usually associated with tubes. The only quality of mine that might be slightly reminiscent of tube is it has an immediacy and neutrality through the mid range that made me think of some single ended triodes I once auditioned. I don't use one exclusively, but it's good to have one around.
I dont know much about the technical or engineering arguments but when I listen to mine- Class D definitely has its pluses, and the ones I've used have speed, control, imaging, transparency and detail that is pretty impressive. And you also notice low distortion, what some describe as the sqeaky clean class D sound. Where it can fall a little short is harmonic overtones, I can notice it relative to the tube or class A amps I've had/have but the overall tonality is plenty good enough to me, or more specifically, easier to overlook given its other pluses. Sometimes class D is described as being tube like in sound, I don't think so, at least not in a classic tube sound sense; mine and others I've heard don't have the tonal density usually associated with tubes. The only quality of mine that might be slightly reminiscent of tube is it has an immediacy and neutrality through the mid range that made me think of some single ended triodes I once auditioned. I don't use one exclusively, but it's good to have one around.