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Amazon.com: Hifonics BXiPro3.0 Digital Bass Processor + HFEQ 4-Band Source Signal Processor, PFM Subsonic Filter, Parametric Bass Equalization with Gravity Magnet Phone Holder Bundle : Automotive
Mtx Thunder1000.1 Class D 1000 Watt Rms Mono Block Compact Vehicle Stereo Sound System Amplifier W/ Selectable Bass Boost, & Variable Subsonic Filter : Target
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One Channel Car Audio Mono Amplifier, 3900 Watt Max @ 1 Ohm High-Powered Mono Car Amplifier with Subsonic Filter and Low Pass Filter, Cooling Fans, White
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