Last night I compared the HT 3 seats with high headrests vs. the Herman Miller Embody and I have mixed feelings. With the HM there's definitely more air and "presence" (low back, no headrest) and slightly more dynamics to my ears, the bass is significantly worse. I expected more bass since HT seats / couches can act as bass absorbers but the difference is quite profound. While dialing back the JL Audio F112 helped a bit it's just plain bloated. And while I know I can tweak the bass and seat position my gut tells me I may end up selling the Embody and may end up buying a single low back comfy chair, we'll see.
I'm patting myself (and my ears?) on the back. Measuring before and after confirms what I heard. For me this is a wake - up call in terms of chair height, material and placement importance. As you can see the mid - highs are much flatter and the bass has larger peaks. The HT seats aided as a bass trap but adversely affected the top end with the high back pleather. And yes, I know I have a nasty ~30Hz peak, working on that.