– Color: Blue
– Material: Glass fiber
– Potentiometers: Frequency adjustment, volume control (left to right)
– Supply voltage: AC dual 15V (5W)
– Frequency range: About 22Hz~210Hz
– Spacing between the potentiometer: 41.5mm
– Use Two NE5532 Op-amp to do the signal processing
– Connect its input sockets to normal amplifier, it can form a subwoofer
– The input can be single channel or stereo
– Easy to use, perfect for your DIY project