I watched it the same way. I didn't think that the bass was too much. Are you sure your receiver didn't get reset or anything? I did notice that the episode was LOUDER than previous episodes especially with all the "pew pew" shooting going on.I watched via the Amazon Prime CBS-AA channel. Audio was DD5.1, but the bass was way overcooked for this episode. I turned my volume down 10 dB below normal levels and my wife still came downstairs to complain that the whole house was shaking, even during non-action scenes. My room is pretty well nailed down, yet I still got a rattle from somewhere. It was really obnoxious and distracting. The whole soundtrack was drowned in boomy bass.
Anyone else have that problem?
I switched the CBS-AA standalone app afterwards to check it out there. On Roku, I can't even get 5.1 from that app. Audio was just stereo.