Behringer HD400

2-Channel hum suppressor

Don't be fooled by the compact dimensions of this 2-channel hum suppressor, because as a powerful problem solver it should not be missing in any rack! This handy device quickly and reliably removes hum and noise. The HD400 automatically converts unbalanced signals into balanced signals. The unit has two 6.3mm stereo jack inputs and outputs for two mono signals or one stereo signal.

  • Simple, fast and reliable removal of mains hum and noise.
  • Safe and effective interruption of humming loops
  • Automatic conversion of unbalanced into balanced signals
  • Inputs: 2 Stereo jack sockets 6.3 mm
  • Outputs: 2 Jack sockets 6.3 mm (2x mono or 1x stereo)
  • Dimensions: 32 x 57.2 x 103.6 mm
  • Weight: 180 g

Further Information

Multi-Channel Unit Yes
Active / Passive Passive
19" No
Pad switchable No
Gnd/Lift switchable No
Powered by battery No
Speaker Simulation No

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601 Customer Ratings
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Works like a charm
lerxtdude, 26.05.2020
In my home recording setup I am using a laptop, connected via USB to an external sound card, which in turn is connected to a set of nearfield speakers. After upgrading my laptop I started experiencing disturbing noisy/crackling sounds on the speakers (but not on the headphones), even without audio playing.

As it turns out, this was caused by a ground loop, from both the laptop power supply and the nearfield speakers having grounded power cords.

After doing some online research I came across the Behringer HD400. It is now installed in-between the soundcard output and the nearfield speakers, and with this, the ground loop problem is completely eliminated. I am very pleased with this result.

The Behringer HD400 is compact, relatively cheap, and does exactly what it advertises: eliminate hum and break ground loops. The housing looks solid.

As always, the Thomann service was great, with prompt shipment and very fast delivery to the Netherlands.
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Did exactly what I needed!
BBFPASTOR, 28.08.2020
A DI box is a simple piece of kit when it comes to using it. This wee box did exactly what it said and was simple to set up and use. Matched to stereo out to splitter cables into the box and the reverse out of the box, took care of the hum that was doing my head in.
Simple and easy to use, no power adaptors to muck with and nice and tidy to look at so no one but me will even notice it is there.
Pros; Best place to get it is from Thomann. Price and shipping were both right and fast. Easy to set up. Did what it said it would do. Worked so well that I have now ordered another for another feed into my board!
Cons; So far none.
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A studio saver!
tomatoKetchup, 24.11.2017
Weirdly enough, there doesn't seem to be any other similar devices around. As always when I buy Behringer I am skeptical until I plug the thing in and see what comes out... I have to say for this little black box I couldn't be more delighted!

It just does what it says on the tin: my Moog Minitaur/Roland JU-06/JP-08, all usb-ed on my computer do not make any ground loop noise anymore. And, contrary to what I read on other reviews, I cannot hear any volume drop and the sound is absolutely not affected at all! On top of that the chassis is made of sturdy metal, and after dropping one a few times, there wasn't a scratch on it.

At that price it's just unbeatable... maybe that's why other companies don't even bother making their own versions!
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Very happy - problem solved
sickly_b, 08.03.2021
For quite some time, my windows PC created a unpleasant background grinding / interference / vintage modem type of noise before I inserted the HD400 between my ZOOM R8 sound card and my amplifier. The difference was immediate and the unit is working PERFECTLY, creating a very quiet sound floor when I'm using my DAW or playing tunes from the desktop. One extra thing to mention - it is passive - no power is required. Just some jack plug connecting cables.
Excellent value and v v simple to use
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€24.80
Including VAT; Excluding €15 shipping
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
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