Same thing here, I am using the Logitech G35s, and DS9 is terrible, however it's not all of DS9. Areas such as the Exchange, Shipyard, and sickbay are completely fine. The second when you step into the rotunda however, some of the best pain I've ever felt in my life.
I'm having this exactly. It is a low rumble. I've tried messing with the audio in STO setup, but none of those affect it.