Feature: 1. DURABLE MATERIAL: The adjustment potentiometer adopts fully sealed type, and the input and output terminals use brass terminals. Wiring is easy 2. HIGH EFFICIENCY: This IC base can be soldered at any time, can feel the effect of different op amps, and enhance playability 3. REAL TIME MONITORING: The subwoofer front panel is designed with LED indicators, which can monitor the power status in real time 4. SIMPLE OPERATION: The design is simple and beautiful, and the wiring is reasonable, so that the board has a very high signal to noise ratio 5. INTERFERENCE PREVENTION: The board has strong interference resistance ability. There is almost no noise near the speaker when there is no signal input Specification: Item Type: Subwoofer Preamp Board Material: Plastic Supply Voltage: DC10-24V DC Single Power Supply Frequency Range: 22Hz-300Hz Audios Input: Mono or 2 Channels Audios Output: Mono PCB Specification: Approx. 78 x 32mm / 3.07 x 1.26in, Thickness: Approx. 1.6mm / 0.06in PCB Material: FR-4 Hard Glass Plate Board Mounting Hole Center Distance: Approx. 70 x 24mm / 2.76 x 0.94in, Hole Diameter: Approx. 3.2mm / 0.13in Potentiometer Axes Spacing: Approx. 32.5mm / 1.28in. Package List: 1 x Subwoofer Preamp Board