Lake of Darkness: The mindbending new science fiction novel from Adam Roberts

MOBIATOR-12'' Car Subwoofer 1400W Max Power, Single Magnet(54Oz), 2 Inch 4Layer Voice Coil, Single 4 Ohm, Easy to Install, Black-S124 (MB-S124)

CT Sounds Hydro 12” Dual 4-Ohm 1000-Watt Shallow Mount Car Subwoofer

Klipsch R-120SW Subwoofer, Black

Audiopipe 12” Car Subwoofer (TS-PP2-12-D4), Dual 4 ohms, 1000W Max, Sold Individually

Klipsch R-12SW Powerful Deep Bass Front Firing 12" Copper-Spun Driver 400W Digital Power Subwoofer 14" X 18.5" X 16"

Audiopipe 12" Double Stack Composite Cone Subwoofer (TXX-BDC2-12), Superior Performance, 1500W Max Power, 2.5" BASV Dual Voice Coil, Aluminum Basket, Multi-Connect Terminals, Dual 4 Ohms

Audiopipe 12" Quad Stack Composite Cone Subwoofer (TXX-BDC4-12), Superior Performance, 2200W Max Power, 3" BASV Dual Voice Coil, Aluminum Basket, Multi-Connect Terminals, Dual 4 Ohms

BOSS Audio Systems Phantom 12 Inch 2300 Watts 4 Ohm Dual Copper Voice Coal Car Audio Stereo Subwoofer Speaker with Poly Injection Cone