Amazon.com: Ground Zero Iridium 16,5 cm / 6.5" Subwoofer - 4 Ohm - 100 WRMS : Electronics
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Sennuopu P65 Automotive Twitter 16 Cm Car Speaker Tweeters Bass 2 Way Car Coaxial Hifi Speaker Vehicle Door Subwoofer In The Car - Speakers - AliExpress
Ground Zero - GZHW 165SPL 16 cm High-Quality SPL Subwoofer 1000WSPL| Maverick's Custom Motorsports
Axton ATW16 16.5 CM / 6.5″ Subwoofer 2 x 2 Ohm 150 Watt Kickbass Woofer | eBay
Ground Zero GZHW 16SPL 16 cm / 6.3″ high quality SPL subwoofer