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Behringer MicroHD HD400 2-channel Hum Destroyer

2-channel Hum Eliminator and Direct Box
14 Write review Item ID: HD400
$29.00

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Behringer MicroHD HD400 2-channel Hum Destroyer
Backordered - More On The Way! – Notify me
$29.00
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Remove Noise from Your Signal

Say goodbye to noisy AC hum and ground loops, with the Behringer HD400 Hum Destroyer. This two-channel solution lets you clean up two mono signals or one stereo signal, and even convert between unbalanced and balanced signals too. Live sound engineers at Sweetwater have managed countless live shows, and we know that you can never have too many problem solvers in your toolbox. When you find yourself with a noisy audio signal due to AC noise or ground loops, you'll be glad you have the Behringer HD400 Hum Destroyer.

Related Videos: MicroHD HD400 2-channel Hum Destroyer

Behringer HD400 Hum Destroyer Features at a Glance:
  • 2-channel hum eliminator and direct box
  • Removes hum caused by AC power or ground loops
  • Converts between unbalanced and balanced signals, with 1/4" TRS connections
  • Completely passive design requires no power supply
  • Perfect for using unbalanced equipment with a balanced audio system
No more hum with the Behringer HD400 Hum Destroyer!
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Tech Specs

  • Type: DI/Hum eliminator
  • Channels: 2
  • Inputs: 2 x TRS
  • Outputs: 2 x TRS
  • Height: 1.25"
  • Width: 4.06"
  • Depth: 2.25"
  • Weight: 0.4 lbs.
  • Manufacturer Part Number: 000-38700-00010

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Customer Reviews

3.8 out of 5

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Perfect for ground loops caused by two-amp setups and stereo pedals

I'm sure that this doesn't cure all hum woes. But it worked for me. I had a ground loop issue that was caused by two amps connected to a stereo Strymon Zelzah (phaser) pedal. This device, plugged into just one of the two amps, solves it. Sweetwater was, unfortunately, not super helpful in tracking down this device, despite it being a prominent issue on Reddit and other places. Two weeks of emails back and forth with my tech and with guitar support and I got nothing. Eventually I had to just buy it and try it.

Turns out that Strymon has a whole page on this issue. I won't put the link here, because I think that's not allowed, but you'll find it if you Google "What's that Sound: Noise and Your Signal Chain". If you have the kind of situation described by Strymon on that page, then this device will fix it. If you don't, this might not help (which I think explains some of the other, negative reviews). I haven't noticed any tone suck. But I don't have a good ear for that sort of thing.

I understand from reviews on other major retailer's cites that gamers also like it too, because it helps eliminate a ground loop that happens when you have your high end audio and video devices plugged into the same equipment (like a PS5 or gaming PC) and the same mains outlet.
by Robert Gramacy from BLACKSBURG, VA on
Music background: Post-covid guitar enthusiast

Thing is amazing

I love this thing, however it works it's awesome. Using it for stereo guitar preamp and it removes all hum
by Matthew Arpaio from CASTLE ROCK, CO on

Wow

Six years of buzzing, creaking and fizzling when running anything that made my computer (particularly GPU) draw power. By the end I was about ready to get a Masters degree in electrical engineering, I'd done so much research on ground loops and power issues in my setup. I had replaced my computer, monitor, interface, cables (XLR, TRS, the works), fiddled with my wiring, and adjusted just about everything except for what I couldn't change: The number of available plugs to go into and power groups in my house.

Now, there may have been some other way to solve my issue, but WHO CARES? This little box solved it immediately, no more ground loop. I ordered it along with two short 30cm TRS cables (maybe go for 40cm if you have the choice, allows for a little more freedom in positioning).

I almost want to buy a second one right away for recording. Maybe I will. The world is my oyster because guess what, it costs literally $. And why should it cost more? It's two transformers in a metal box.

And for those worried about loss in sound quality, or the supposed 'audiophiles' claiming a noticeable difference, check out this thread where someone tested and found basically no discernable difference above 30Hz:
label-the-cable.com/en/ltc-cable-tube

Thank you, Behringer. Up until now I wasn't a fan, but this box is changing my mind fast.
by Thomas on

I’m stunned

I never fathomed my vintage fender amp and pedal chain could be so silent. The only noise is that which you intend. Otherwise you could hear a pin drop. I mounted mine up and behind like a power supply would on my board and it took away zero pedal space. I have my TU-3 going into it then out to the balance of the chain. Wow. Just wow.
by Brian from Northeast Ohio on
Music background: Professional / Performing

JUST THE TICKET!!!!

I love these things! I have tried several other units some cheaper... Don't waist your money. Buy this one! No matter when I used this thing it works. If it doesn't work, check to make sure you are not running your power cords parallel to your 1/4 inch guitar/keyboard cords. Or check your power source itself. Many times when you play in a place that has dimmers on the lights, you will get a hum. This has nothing to do with your 1/4 inch lines. In this case you need a power conditioner. In that case I highly recommend the ANTI-HUM EBTECH unit in conjunction with this one.
by Leonard Dobrzyn from Peckville, PA on
See also: Direct Input Boxes, Behringer, Behringer Direct Boxes
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