Pyle Plpw6d 6 Inch 600w Peak 4 Layer Dual Voice Coil Car Midrange Woofer Audio Speaker, 4 Ohm W/ 89 Decibel Sensitivity, 30 Oz Magnet, Black : Target
Hifonics ZXT12D2 Zeus Extreme Subwoofer 30 CM (12 ") 6000 Watt Zxt (Extreme) | eBay
Source Best bass sound quality 5.5inch subwoofer speaker 6 ohm 30 watt on m.alibaba.com
Amazon.com: Pair of SoundXtreme 12 Inch 2000 Watt Car Audio Subwoofer with DVC Power - Total of 2 Subwoofers Combo of 4000 Watts Handling Power Frequency Response: 30 - 2.5kHz : Electronics
4 Ohm 8 Inch Subwoofer Speaker | Inches 4 Ohm Speaker Woofer - 1pcs 4 Inch Audio - Aliexpress
4" Speaker with Tweeter and Grille, 30 watt max | Mill Supply, Inc.