This permalloy 600:600 audio isolation former uses EE19 Pomor alloy sheets with a content of over 80%, high-purity oxygen-free copper wire, which enables excellent isolation and conversion of audio signals. It can filter and eliminate AC noise interference, remove burrs, improve sound, and make the sound become round, pure, and delicate. The response frequency is extremely wide, and the spect curve is flat. After adding this former to the circuit, the longitudinal depth of the sound field significantly increases, making it very resistant to hearing and instantly improving the sound quality. Suitable for application in various high-end professional HIFI preamp, audio signal boosting, audio DIY, preamp input output impedance matching and other professional audio fields. There are two channels, each with a former. Suitable for professional audio isolation noise, balance and non balance conversion. Frequency Response: 20Hz-20KHz AC Impedance: 600:600 (1+1:1+1) Notice: This isolator cannot be connected to the output end of the power amplifier. High voltage at the output end of the power amplifier will burn out this isolator! Colour:Photo Color Material:Plastic Package Contents: 1x Balanced 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.