Function: Convert the high-level signal from the power amplifier's speaker output port into a line output or microphone-level signal. It uses a permalloy isolation transformer internally, which delivers excellent frequency response and anti-interference performance. The converted low-level line output signal can be connected to the line input interfaces of active subwoofers, mixers, power amplifiers, or other audio devices. The converted low-level microphone output signal can be connected to the microphone input interfaces of mixers, sound cards, or other audio devices. Interfaces & Technical Parameters Input Interface: Screw plug-in terminal block Line Output Interface: RCA phono interface Microphone Output Interface: 3.5mm Frequency response: 40HZ-20KHZ Input Signal Voltage Range: 4Ω/1W, 8Ω/0.5W (2V) to 4Ω/100W, 8Ω/50W (20V) Attenuation: Line Output: Adjustable from -7dB to -33dB Microphone Output: Adjustable from -28dB to -43dB Color: Black Material: Aluminum Alloy Package Contents: 1 * Audio Isolator