Behringer MICROHD Hum Destroyer HD400
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- Removes ac hum and noise - fast, easy and reliable
- Breaks ground loops safely, while keeping highest sonic quality
- Automatically converts unbalanced to balanced signals without any signal loss
- Two 1/4' trs inputs and outputs for 2 mono or 1 stereo signal
- High-quality components and exceptionally rugged construction ensure long life
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Ultra-Compact 2-Channel Hum Destroyer Removes AC hum and noise - fast, easy and reliable Breaks ground loops safely, while keeping highest sonic quality Automatically converts unbalanced to balanced signals without any signal loss Two 1/4' TRS inputs and outputs for 2 mono or 1 stereo signal High-quality components and exceptionally rugged construction ensure long life Conceived and designed by BEHRINGER Germany
Behringer Microhd HD400
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Top customer reviews
Here's some background about my setup: I use 2 sound cards on my PC. One is a Firewire audio interface for my pro-audio & music authoring needs, while the other is a Sound Blaster for all other sounds I expect from a PC. The audio interface is connected to my studio monitor while the SB is connected to my HiFi amp. However, the amp also has one mono output for the subwoofer while I also drive a third output from the Audio Interface to the subwoofer (I cannot really afford the space for a reference subwoofer).
This, in addition to differences in the power input (some components are connected via a UPS, most others are not) creates a ground loop. I'd rather climb a mountain rather than try to figure out what might cause the loop, but I did notice that if I unplug one of the two inputs to the subwoofer, it stops.
Connecting the HD400 to the inputs of the subwoofer solved my ground loop issue for good. Highly recommended; I don't regret its price.
I connected the inputs of this to balanced TRS cables, with TRS cables on the outputs, connecting one sound desk to another where there's often a ground loop hum.
At first, it didn't seem like we were getting any signal, but after turning up the gain to an unnaturally high level (the sort of level that would normally have any microphone feeding back like there's no tomorrow) a signal was coming through. At first it sounded as if it was a much clearer signal than before, but after 5 minutes of listening I noticed that it was completely devoid of all bass. All frequencies below about 200Hz seemed to be just completely cut off.
I picked up the box and noticed something else - tapping on the outside of the device (which is quite small, 5.5x10.5x3cm) creates a tapping sound through the whole sound system. It's as if there's a microphone inside that's picking up sound and sending it down the outputs!
Also, I thought that a box like this would be quite happy sat as part of a rack mount (obviously it won't mount in a rack itself, but I placed it on top of my Behringer P16i module) and when placed here there was an awful electrical hum. If I moved it away and held it in open space there was no hum. But what good is something for live sound that can't be used in a rack mount?!
As soon as I plugged it in the noise stopped!!!
Another great Behringer product!
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