Steel basket Subwoofer/Non-Pressed Paper Cone
High Foam surround/100 OZ Ferrite Magne/2.5"4-Layers Voice coil

KSW-1048D4
Description:10"subwoofer
RMS Power:750w 
Max Power:1500w
Impedance:4×4ΩVoice coil

KSW-1248D4
Description:12"subwoofer
RMS Power:750w
Max Power:1500w
Impedance:4×4ΩVoice coil

KSW-1548D4
Description:15"subwoofer
RMS Power:750w
Max Power:1500w
Impedance:4×4ΩVoice coil