That sounds pretty interesting... I wonder if you just just take a tiny driver, and use that as a passive radiator, as you might have trouble finding a tiny passive radiator.
Yeah, I was just thinking, as 2" seems pretty big for something in a headphone, and thats the smallest I could see a passive radiator. But you can get even smaller drivers, which would work as a passive radiator if not powered (although may want to remove voice coil and/or magnet so nothing funky happens). Seems pretty complex, but definitely may be able to have some interesting results with that.
The TH900s push some serious air, I'm going to seal off the baffle which is normally vented so these passive radiators get smacked with quite a bit of energy on the backwave. On a fully sealed cup with the sealed baffle you can feel some pretty intense vibrations in the cups from the outside with your fingertips even with pretty heavy damping inside. I think it'll push the 2" passive just fine.
That's with the majority of the rear driver vents opened. With the normal stock paper covering there's much less backwave energy, but all those nasty treble peaks...
Makes sense, I was just thinking in my mind of a more discrete design, like how some headphones are discreetly ported. But yeah, I guess a 2" passive radiator does make sense with a 50mm driver, as 50mm=2" anyway. I was thinking 2" was much bigger than 50mm with my quick mental conversions, but thats wrong.
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