Built for High Performance SPL the BOA Series subwoofers are Dual 1 Ohm at 6,000 Watts RMS & 12,000 Watts MAX. The BOA151 uses 4” Dual Impedance Black Anodized Voice Coil Formers with Kevlar Spunlace. Supports a custom tooled rubber gasket and magnet boot with Massive high energy triple stacked 470oz Strontium magnets.