DI box is great for instrument input but unfortunately the issue is with his mixer, the power coming out of the wall is dirty so he needs something to plug the mixer power cable into that will have the same effect as a DI box does for line inputs.
DI box is great for instrument input but unfortunately the issue is with his mixer, the power coming out of the wall is dirty so he needs something to plug the mixer power cable into that will have the same effect as a DI box does for line inputs.