Have you not heard of people hooking up their headphones and having an external subwoofer hooked up as well? It sounds like the people who do that enjoy it. I'm sure it will be jarring, but I don't want to be overly dismissive of something that could genuinely work if properly developed.

And idk, is that idea really any more jarring than Sennheiser imaging being 3 distinct and seperate fields? They're just different flavors of "bad imaging" aren't they? But if it's possible to have a woofer handle the bass, we can get away with some pretty hefty subbass boosts and extension (with impact) without compromising the tuning of the mids and treble.

Do you have the names of the products that tried this before? I can only think of the nuraphone, but I'd love to see what has been tried before.