Alpine RS-W12D4 R-Series shallow-mount 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: Soundavo PSB-1000DSP Class D 1000W RMS Subwoofer Amplifier for Home Theater with RS-232 / IR Remote Control, Dual Sub Speaker Outputs : Electronics
Gladen RS-X 12 SB subwoofer box 30 cm
Resilient Sounds RS 10" D4 - 500w RMS Subwoofer
PSB-1000DSP Subwoofer Amplifier with RS-232 / IR Remote Control, Dual – Soundavo