The T8 (Transformer Eight) from ART is a high quality, totally passive audio interface, housed in a rack mount chassis, that uses eight transformers to separate input and output signal grounds, thereby isolating any two systems and reducing hum and ground-loop noise. The unit's audio transformers have flat and wide frequency response and handle high signal levels while maintaining an isolated balanced output. This gives the T8 a very clean and neutral sound with a wide variety of signal sources. The transformers are wound for 1:1 unity gain and are designed to be used with impedances from 600 Ω to 100k Ω.