Behringer HD400 Hum Destroyer / Ground Loop Noise Eliminator Purchased new, used only once to confirm functionality, so it's practically unused. It has not been used in actual operation, and there are no noticeable scratches or stains. I purchased it as a noise countermeasure for my turntable + phono equalizer + speaker (Sonos Five) setup, but the problem was resolved by adjusting the source level, so I no longer need it and am putting it up for sale. 【Product Overview】 ・2-channel ground loop noise elimination ・RCA (line level) compatible ・No power required (passive) ・Small and lightweight, easy to install model This is a standard model for hum noise countermeasures that occurs with combinations such as turntables, phono preamps, active speakers, and audio interfaces. ⸻ 【Condition】 ・Functionality confirmed ・Almost unused ※Everything in the photos is included ⸻ 【Notes】 This item has been in someone's possession once, so please refrain from purchasing if you are concerned about minor details.