Item Type: Pre-Amplifier Module Chip Model: NE5532 Filter Type: Subtraction divider Crossover Point: Crossover point 500HZ, 5kHZ (that is, 20HZ-500HZ is the bass output, 500HZ-5KHZ is the midrange output, and 5KHZ-20KHZ is the treble output) Attenuation Slope: -24dB / Oct Board Structure: 3-channel output, treble, bass, midrange Op Amp Chip: NE5532P (other op amps can also be replaced, such as OPA2604AP OP275G TL072, etc.) DC Positive And Negative Poles: Dual 9-15V 1?��The product has 3?channel output, treble, bass and midrange with stable performance? 2?��The product is DIY kit, preamplifier, which can be adjustable, easy and convenient to operate? 3?��With NE5532P op amp chip, professional design and reasonable structure, easy to install? 4?��High quality material can make sure the durability and stability of the product? 5?��The connecting part has good contact performance, which can ensure stable working