sentences:  Small listening rooms suffer a paucity of low frequency resonances with gaps between them, so another complementary method is adding a subwoofer to drive the room resonances from an optimal physical location that minimizes ripple in the frequency response at the listening position.Yet another complementary method is splitting an existing subwoofer allocation up into multiple smaller subwoofers in spatially separated locations that increase the degrees of freedom available to tune the response with.Multiple subwoofers also tend to smooth the bass response across a larger listening area and are often easier to place for good bass response than a single larger subwoofer (or no subwoofer).