Dual-channel professional-grade passive audio isolator, using Permalloy material audio isolation cattle, so that the signal is completely connected. Dual and XLR XLR inputs, XRL XLR outputs. Unbalanced signal can be input into balanced signal output, balanced signal can be input into balanced signal output. Each channel has a common ground and non-common ground switch. It can completely isolate the potential difference between the two systems, avoid AC noise interference caused by grounding problems, and prevent damage to the input components of the device due to excessively high potential differences. Achieve the secure mission of audio signals. Remove the noise generated by the connection between the camera and the audio equipment; the noise generated when the simultaneous interpretation equipment is connected to the mixer; the noise generated by the laptop connected to the mixer; the noise generated by the electronic musical inst ent connected to the mixer. Noise from distance mission inconsistently; noise from equipment and equipment impedance mismatch. It is also suitable for a series of sound equipment systems such as large-scale outdoor performances, Fast Charging protection, sound engineering, conferences, entertainment venues, exhibitions, etc. It is a necessary equipment for audio system cascade. Technical parameter: 1. Impedance ratio: Input impedance: 600Ω (AC impedance) Output impedance: 6002 (AC impedance) 2. Frequency response: 20Hz-20KHz (± 0.3dB,+4dBu) 3. Fixed loss: Less than 0.7db (ref 1khz 1Vrms) 4. Input level:+28dBu ( Less than 0.5%, 50Hz: Less than 0.01%, 1KHz) 5. Distortion: 0.0025% (+4dBu 1KHz) 6. Loss attenuation: -0.5dB at 600Ω load; 0. dB at 10KΩ load 7. Settings: Input - XLR female and output - XLR male Jack 6.35mm dual core socket input/output A channel grounding switch, B channel grounding switch, A+B shielded enclosure switch 8. Siz