Perhaps semantics but I think of electronics responsible for “black backgrounds”. I suppose the analog in the speaker realm is “transparency”.
IMO, Thiels are generally very transparent. That was one of the strengths of my 1.6s. That said, I heard a subtle “glassy” quality in the midrange when I bought my 2.4SEs in 2018. It might have been the FST-sourced crossovers (lower quality parts compared to crossovers built at the Lexington shop) or, maybe, damaged resistors (the OEM resistors showed evidence of overheating when I replaced them). That quality was mostly, if not completely, remedied by the Mills resistors. And my final boards not only have zero trace of that anomaly but the transparency is topshelf, equivalent to the very be$t speakers I’ve heard.
It could be that your 2.4s are more revealing flaws in your electronics rather than the other way around.
IMO, Thiels are generally very transparent. That was one of the strengths of my 1.6s. That said, I heard a subtle “glassy” quality in the midrange when I bought my 2.4SEs in 2018. It might have been the FST-sourced crossovers (lower quality parts compared to crossovers built at the Lexington shop) or, maybe, damaged resistors (the OEM resistors showed evidence of overheating when I replaced them). That quality was mostly, if not completely, remedied by the Mills resistors. And my final boards not only have zero trace of that anomaly but the transparency is topshelf, equivalent to the very be$t speakers I’ve heard.
It could be that your 2.4s are more revealing flaws in your electronics rather than the other way around.