Feature: 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 Specification: 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. Package List: 1 x Template4 x B1715 Capacitor1 x Terminal(4 Pieces Assembled)26 x Adjustable Potentiometer14 x IC Chip1 x IC Seat1 x Capacitor Pin43 x Resistance Note: Do not exceed the voltage outside the parameter range