All / SR-212LF Compact Subwoofer SR-218LF Maximum Output Manifold Bass Reflex Subwoofer SR-221LF Maximum Output Manifold Bass Reflex Subwoofer SR-215LF Maximum Output Manifold Bass Reflex Subwoofer iws12-6 High Output Architectural Subwoofer iws12-9 High Output Architectural Subwoofer sub12 12” High Output Passive In-Room Subwoofer sub15 15” High Output Passive In-Room Subwoofer