I think "ortho wall" should be one centralized frequency rather than a spread of frequencies like that, as it is more the product of tension rather than anything else. And the higher the tension, the higher the frequency, of course. For instance, I think in your spectrogram, your tension is at around 5KHz. But when it's spread out over a big area, I think it's due to other things (reflections?) rather than "ortho wall". Maybe this is why HE-6 owners swear by mods? Here's the spectro of LFF's Code-X: Notice how the ringing is centralized on 5-6KHz rather than spread out? Of course, this is kind of a skewered comparison. Luis most likely applied black magic to his Code-X (he admitted as much). I'm not confident I can take an ortho and make it this clean, either, but... just to say, I think this is the benchmark for orthos. Another benchmark is the Abyss modded by Marv: This one clearly looks like it has higher tension as the frequency is higher. Maybe that's why Marv kept writing "fast bass", and people go "WTF do yoo meen?" Either way, though, just food for thought. If you're happy with how your HE-6 sounds like now, I don't see why you have to change it.