BB Distribution - The 4 Focal Flax subwoofers consist of straightforward 4-Ohm voice coils which are perfectly suited for small enclosures (closed or bass-reflex) as small as 0.35 CuFt. The Flax subwoofers
Focal Sub P 30 F - 12 Inch 4-Ohm Component Subwoofer - Car subwoofers - Custom Sounds & Tint
Focal 12" Single Coil Subwoofer - 30 A4
Focal E 30KX K2 Power Series 12" dual 4-ohm voice coil component subwoofer at Crutchfield
Focal 12V726 12" subwoofers woofers pair | Reverb
Focal SUB 12 SUB Series 12" Single 4 Ohms Voice Coil Car Subwoofer with 600 Watts
Focal Access 30 A1 12" 4-ohm subwoofer at Crutchfield
Focal Sub 12 Dual 12" dual 4-ohm voice coil subwoofer at Crutchfield
Focal Sub 12 Slim 12" Shallow Mount Voice Coil 4-Ohm Subwoofer - Pair | World Wide Stereo