I purchased the Behringer HD400 as i have encountered ground loops at some venues and practice spaces due to my use of the 4 cable method between a tube amp head (peavey 5150II) and an external pre-amp (digitech GSP1101). This little device when placed in the send and return section got rid of the ground loop hum problem easily. its small and easy to fit either in the back of a rack or ontop of an amp head the only downside is there is a noticable drop in volume when using this product. its nothing to bad, 4dB at the most, easily cured with more volume on the amp head itself
all in all a great, cheep, effective and easy solution to an irritating problem. if you have ground loop hums you have no excuse not to purchase this product
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Forget the expensive stuff
TC Vu on 14.02.2014
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 - wouldnt 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!
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