There’s no such thing as a "musical" or ("non-musical") sub. It either extends to a certain range at a certain decibel level within an acceptable range or it doesn’t. Don’t get caught up in the JL "musical" hype.
Some of the others are right about multiple subwoofers. You can read all about the reasons and placement in Harman’s white paper. To skip all the technical info just go to Conclusions to get optimum general placement for two or four subwoofers, although it’s also advantageous to understand why you place them at certain wave length distances, but the Conclusions will get you close. And although it doesn’t include all subwoofers, you can go to Data-Bass to get tested specifications on subwoofers.
Some of the others are right about multiple subwoofers. You can read all about the reasons and placement in Harman’s white paper. To skip all the technical info just go to Conclusions to get optimum general placement for two or four subwoofers, although it’s also advantageous to understand why you place them at certain wave length distances, but the Conclusions will get you close. And although it doesn’t include all subwoofers, you can go to Data-Bass to get tested specifications on subwoofers.