@Serious, I agree with all your points. The “edginess“ of higher-order crossovers is probably what I am referring to. See, for example, comments by people converting Troels’ ellipticor-3 first-order crossovers to one with higher slopes for better “dynamics” despite the first-order version having “electrostatic-like” speed from the Scanspeak drivers. Equally I have speakers with both 2nd order crossovers (with flat-ish F.R.) and no-crossover widebanders (with shit F.R.). The widebanders sound better for well mic’ed recordings of instrumental music. I agree also that some headphones count as fairly coherent, especially planars, and it’s why I like them. I was under the impression that all dynamic drivers had some phase shift—am I wrong here? In any case, still better than speakers. That’s actually a big part of why I hang around SBAF. That and the haute-culture company that this place attracts. I can’t argue decisively for or against linear-phase filters. You’re right that the group delay is *mostly* constant over the pass band, but how much dispersion is allowed in the definition of “mostly”? It’s certainly not the case that oversampling DACs don’t have timbre or stage; they do! It’s that NOS DACs seem to do it even better, and I was theorizing that the reason might be the smaller phase shifts from the gentler analog filters. We can hear remarkably small levels of nonlinear/harmonic distortion at THD=0.05%, so why not also remarkably small phase shifts on key overtones? I don’t know; I’m offering this as a theory, not gospel.