Features: D718 and B688 Random Delivery! Beautiful and elegant, low noise. Uses 6 disassemble amplifier tubes, of which 4 is responsible for the left and right channels, the other two connected into a BTL circuit for subwoofer use. Cost-effective, wiring is very simple, especially for DIY entry. Use 2pcs 15000UF 40V Filter Capacitor, high power and good sound quality. Specifications: Working Voltage: Dual AC18~24V Output Power: 3x80W Frequency Response: 20HZ-30KHz Size: 15x16.5cm/5.90x6.49inches Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xAudio Preamp Board