POWERBASS S-12TDPOWERBASS S 12TD Thin Mount 12" Subwoofer Our new Thin Woofers are only 3. 25" deep but don't let its lean size fool you, these woofers are big on bass. We gave our engineers the difficult task of building a thin woofer that was up to the PowerBass reputation of great performance at an exceptional value. Starting with our proprietary poly carbonate glass fiber composite frame, we built a basket that is stronger then steel and lighter then cast