Multiple small subs can also work wonders for mitigating room modes and providing the proper SPL to compliment your mains.
A big sub always has an advantage. The old saying still holds true . . . there's no replacement for displacement . . . and a large driver doesn't have to move much to get that displacement.
A big sub always has an advantage. The old saying still holds true . . . there's no replacement for displacement . . . and a large driver doesn't have to move much to get that displacement.