Crystal Subwoofer Pre-amp Board, Low Pass Filter For Frequency-BASS Boost with Gain Adjustable Control, DC 24V To 42V Dual Supply

Crystal Subwoofer Pre-amp Board, Low Pass Filter For Frequency-BASS Boost with Gain Adjustable Control, DC 24V To 42V Dual Supply Built high-grade components Used, Control: Allows for fine-tuning of audio gain, providing optimal control over output levels in different environments Filter: Integrated Precise Frequency Enhancing The Clarity And Depth Of Bass Output. & Boost: Customizable frequency settings and bass boost-tailored sound enhancement, ideal for deep applications.