I was about to vote 2nd sub, but bass traps would probably be more effective. Don't be fooled though, just because you are "trapping" bass in the corners, doesn't mean that you will have even less bass in the room. From my experience (with other people's theaters) and from what I've read, by "trapping" the bass in the corners, you are reducing some nulls in other areas (your listening area) and the bass can actually seem louder and cleaner...


Farewell - June 4, 2020