Owen_Electric wrote:

Completely off topic but.. why is the bass very loud and ground shaking indoors, but outdoors nearly inaudible? Also, I am unfamiliar with 0 and 180 degree options.

No walls for the lower frequencies to bounce against.

Click the following link: https://www.cnet.com/how-to/how-to-set-up-a-subwoofer/
...and read the paragraph about phase.