Do you have a device that hums and buzzes? If you touch it and the noise decreases, your system probably does not have an earth/ ground connection. This connection is responsible for reducing the noise and shielding your system from interference. In such a situation, you need the iFi Audio Groundhog . It earths your audio system and puts an end to the buzzing sound.
PS: If the humming and buzzing continue even after touching, you're probably facing a ground loop caused by multiple earths. In this case, you'll need the iDefender3.0.

Connect your Groundhog to just about any and every device on the market with its multiple adapters. Add resolution and bass to your music with these:
RCA base cable - For audio systems with an unused RCA connection as well as the iPurifier to further reduce noise.
USB converter - For computer audio systems.
Spade converter - For power supplies with a DC barrel connector.
3.5mm Y-converter - For portable devices/ systems with an unused 3.5mm socket.