The passive Ultramagnetics Iso Splitter is a DI box that splits the signal from a 1/4" TRS to two 1/4" TS. Output 1 is ground isolated and output 2 is not. This stops the ground loop between two amplifiers. It can be used with any stereo instrument wired with a 1/4" TRS jack. The Ultramagnetics Iso Splitter features two isolation transformers and is hand wired point to point in the USA.