Subwoofers Unpowered. Powered. Unpowered. C W210 Double 10” Front-loaded Precision Subwoofer C W1 Single 15” Front-loaded Precision Subwoofer C W18 Single 18” Front-loaded Precision Subwoofer C WH Single 18” Hybrid Subwoofer U SUB Double 18” Hybrid Subwoofer T SUB Eight 10” Band-pass Subwoofer C W2 Double 15” Front-loaded Precision Subwoofer C SUB Four 10” Band-pass Subwoofer Powered. Double 10” Front-loaded Precision Subwoofer Integrated FIRTEC™ controller / amplifier CPD B2 powered CPD W1 powered Single 15” Front-loaded Precision Subwoofer Integrated FIRTEC™ controller / amplifier CB 18 powered Single 18” Front-loaded Precision SubwooferIntegrated FIRTEC™ controller / amplifier CPD WH powered Single 18” Hybrid SubwooferIntegrated FIRTEC™ controller / amplifier Double 15” Front-loaded Precision Subwoofer Integrated FIRTEC™ controller / amplifier CPD W2 powered CPD SUB powered Four 10” Bandpass SubwooferIntegrated FIRTEC™ controller / amplifier