is more subs better?
The answer is “yes, but….”
For 2 channel audio, Smoother Frequency Response: Multiple subwoofers can help to even out the bass response across the listening area, reducing peaks and nulls (dead spots) that are common with a single subwoofer. The second subwoofer makes a huge difference, but each subwoofer added afterwards yields increasingly smaller benefits.
So yes, each added subwoofer benefits a smoother frequency response, “but” is adding 2 more subwoofers better than spending the funds somewhere else for greater sonic benefit…..?