For those the DIYers and the experimenters, we here at Seismic Audio sell replacement speakers for all 18” and 15” subwoofer cabinets. The San Andreas raw speaker will reach as low as 35Hz and handle 1000 watts of power with ease. The incredible price makes it the first choice for an affordable replacement. The New Madrid 18 boasts a gigantic 240 ounces of magnet and four inches of voice coil. The solid construction lets this speaker get all the way down to 25Hz and handle 1500 watts of power. The Quake series of replacement woofers provide the most affordable 18” and 15” high quality speakers on the market. Great performance and cheap enough to keep some spares on hand for those worst case scenarios.