1. Noise occurs when the computer is connected to a large screen or projector; the large screen leaks electricity 2. Noise occurs when the mixer and the power amplifier are not on the same ground. The computer audio is transmitted over long distances using a card-by-wire cable; 3. Send signals to the TV station to prevent fires and burn the mixer 4. Prepare several channels for musical instruments during performances. When the musicians change instruments, the mixer does not need to lower the volume. There is no impact sound when changing cables or instruments 5. The computer audio cable is converted to a dual card-by-wire cable through a pigtail, but it is still unbalanced transmission. The cable cannot be too long. For long-distance transmission, it must be converted through an isolator to be truly balanced cable transmission. The instrument has a 6.35 unbalanced signal interface. If it is to be used in a place far away from the mixer, it must be converted to a balanced cable with an isolator on site (no more than 3 meters of audio cable) before it can be sent to the mixer over a long distance. The audio signal isolator has two-way XLR cable input and XRL cable output. It can input unbalanced signals and output balanced signals, as well as balanced signals. It is also suitable for a series of audio equipment systems such as large-scale outdoor performances, -Pattern protection, sound engineering, conferences, entertainment venues, exhibitions, etc. It is a cascade device for audio systems. Input impedance: 6002 (AC impedance) Output impedance: 600Q (AC impedance) Frequency response: 20HZ-20KHZ Nominal loss: Less than 0.7db (ref 1khz 1Vms) Insulation resistance: DC1000V 100MQ Isolation voltage: AC 50Hz-60Hz0V-1500V Colour:Black Material:Metal Package Contents: 1 x Audio Isolator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.