Total
Features
Sound
Quality

Forget the expensive stuff

This little device solved a major problem. When I connect my laptop computer with my active studio monitor speaker a humming noise occurs. Tried an Art DTI hum eliminator - wouldn’t work. After a little while of internet research I found people recommending the HD400. Well, it does its job perfectly! Little money, great effect. If you have hum in your circuitry, try the HD400!