SolarCetacean
500+ Head-Fier
Thanks for clarifying your terminology. I agree with what you're saying, and I've noticed the same things. The "pop" to the transients does sound more like what I've heard from good two-channel speakers and I think that's something that good macro-dynamics improves, at least in my experience. When I started using my Erco, I thought that all of the sounds, particularly the tiny background details, would "pop" more when they were played so they were easier to perceive. I agree it's phenomenon that's also felt in the ears and head rather than just heard.Nah, slam isn't to do with treble. Punch can occur at any frequency, however, and actually the HEDDphone is kinda cool in that it exemplifies this. There's a tactile "pop" to transient attack, which is more common on speakers but less in headphones. Almost like you can feel it as much as hear it in your eardrums.
Slam is more like that dynamic swing you mentioned, although pertaining specifically to bass. I think it has a lot to do with bass volume, and sub bass extension as well. So yeah it would definitely be measurable, but it's also possible for a bassy measuring headphone to sound soft and spongey in the lower frequencies (Shure SRH1540, for example). Tight response is also important to slam.
With slam, I think that for whatever reason, the way we currently measure FR (like the Farina sweep) isn't good at measuring the sense of slam. If it's the size of the dynamic swing, then I suspect a Farina sweep will never be able to properly measure it because those sweeps use constant power, hence have no dynamics. And I agree that some headphones can measure bassy in the FR graph, but have a softness to their bass compared to other headphones that are tighter and punchier in their bass attack. I think that my Aeon 2 Noire suffers from a "rubbery" texture to its bass even though there's a lot of bass in the measurements. And that rubberiness is something that goes away if I use dynamic EQ to boost the dynamic swings in the bass or use a dynamics-heavy chain.