DD Audio Redline 10" - 300w RMS Car Audio Subwoofer
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4XL-151D 15" Subwoofer
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Bass Test Subwoofer by Bass Test on Beatsource
4XL-151D 15" Subwoofer
Car Subwoofer by HippoXL124 SPL Extreme Bass Woofer 12 Inch Car Audio 4000 Watt HippoXL Series Competition Subwoofer Dual 4 Ohm 3 Inch Voice Coil Sold Individually - Newegg.com
Zenith Model LHS-D5245W Extreme Bass Subwoofer Tested 8.5ohms | eBay
800W Extreme Power Bass System Combo
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Directed Audio Xtreme 104SX 10" 4-ohm subwoofer at Crutchfield