Alpine SWT-12S4 30 cm (12-Zoll) Bass Reflex Subwoofer Rolle (4 Ohm) 1000 Watt 4958043543946 | eBay
Car enclosed subwoofer 12 "30 cm ALPINE SWT-12S4 sound electronics columns 92dB subwoofers for cars acoustics auto audio parts components speaker - AliExpress