Exterminate ground hum at the source! Filters unwanted low voltage from ground line that cause ground Hum while maintaining ground connection. Simply plug Hum X into the offending outlet and plug your equipment into Hum X. That’s it! Max current draw 6 amps (720 watts). LED indicator and two-year warranty. NOTE: Hum is caused for many different reasons, the Hum X is designed specifically for ground loop related hum problems. For other types of hum issues, you may need our Hum Eliminator. Hum X works only on three prong power cords and outlets. Not sure if Hum X is solution to your hum problem? Contact tech@ebtechaudio.com for help.
$ 90.00
83 of 84 people found the following review helpful
Works great for laptop to sound system hum, By
This review is from: Ebtech Hum X Voltage Hum Filter (Electronics)
Customer Video Review Length:: 2:31 Mins It worked perfectly for my application. I use my laptop for DJing. When I plug in my laptop to my mixer I got an awful hum. I noticed that when I unplugged the power supply to the laptop and let it run on battery power the hum went away. This led me to the assumption that I needed a ground loop isolator (Hum-X). I got the Hum-X, plugged my laptop’s power supply into it and it ito the wall and the hum was eliminated. The product works as intended. There are some other reviews here that say it doesn’t work. Fact is, it doesn’t work if your problem isn’t a ground loop. If you have a ground loop problem, this will fix it. 0
71 of 73 people found the following review helpful
A lightweight alternative to using a heavy isolation transformer, By
Norm Smith (South Florida) – See all my reviews
Verified Purchase(What’s this?)
This review is from: Ebtech Hum X Voltage Hum Filter (Electronics)
When two or more devices are connected to a common ground through different paths, ground path noise, or a ground loop can occur. Thus, a system grounded at two different points, with a potential difference between the two grounds can cause unwanted noise voltage in the circuit paths. Currents flow through these multiple paths and develop voltages which can cause damage, noise or 50Hz/60Hz hum in audio or video equipment. The HUM X is an electronic device that will remove up to 6 volts of ground loop voltage differential and has a maximum load current rating of 6 Amps or approximately 720 Watts. It is not an isolation transformer. The HUM X is a ‘differential amplifier’. A differential amplifier uses an operational amplifier (op-amp). Differential amplifiers amplify the difference between two voltages making this type of circuit a subtractor unlike a summing amplifier which adds or sums together the input voltages. Eliminating the effects of the circulating current created by the differential voltage between two equipment grounds is the goal. The situation here being the common line ground and the load ground. Removing a line cord’s ground connection is simply not safe. It’s also contrary to electrical safety regulations (NEC – National Electrical Code?) and potentially very dangerous. Removing the ground connection can defeat the protective action of any line voltage spike protectors located inside your equipment. If the ground connection is cut any fault in the insulation inside equipment can leak potentially dangerous voltage to the equipment case (chassis) instead of burning a protective fuse or tripping a protective circuit breaker. Never use a three-wire to two-wire line voltage adapter on any piece of audio gear where a human can possibly come into contact with it. If having done so eliminates the hum, utilizing the Ebtech HUM X should safely allow correction of the condition. You may also alternatively reliably isolate your equipment completely from the power line using a more expensive and very heavy isolation transformer. By using an isolation transformer, the ground noise voltage will now appear between the transformer windings and not circuit input. The noise coupling is primarily a function of parasitic capacitance between the transformer windings and can be reduced by placing a shield between the windings. * Tripp Lite IS250 250W Isolation Transformer 2 outlet 6ft Cord * Tripp Lite IS1000 1000W Isolation Transformer 4 outlet 6ft Cord Typical ground loop problems can also be solved using ‘audio’ isolation transformers inserted into the audio lines. * ART CleanBox II Passive Hum Eliminator * Behringer HD400 2-Channel Hum Destroyer Optical coupling can also be used to eliminate the potential for ground loops. * Turtle Beach Audio Advantage Micro II USB Analog & Digital Audio Adapter * Digital Coax & Optical Toslink to Analog Audio Converter A noise gate can also be used to reduce hum. A noise gate doesn’t let any sound through the gate unless the sound has a signal level which is higher than the set gate threshold value. If the problematic hum is very faint a noise gate can make it much less annoying. When you set the noise gate threshold so that the gate does not pass any signal when there is silence in the source music the hum is not added to the main mix. When the sound level rises above the noise gate’s trigger setting the humming is difficult to notice due to masking by the louder musical passages. *…
66 of 70 people found the following review helpful
Mystery solved: grounding pin connected through a couple of diodes, By
biggvsdiccvs (Berkeley, CA, USA) – See all my reviews
Verified Purchase(What’s this?)
This review is from: Ebtech Hum X Voltage Hum Filter (Electronics)
The description on Amazon claims that this thing “Filters unwanted low voltage from ground line that cause ground Hum” without bothering to explain what that is. The description on the package actually mentions ground loops specifically.
I thought that maybe it had chokes that might help with high-frequency interference in some devices. It did not make a difference in my case. As far as its ability to eliminate ground loops, I was very skeptical, since it does its magic “while maintaining ground connection” (which is a good thing). By the way, in my case an audio isolation transformer solved the problem, as I knew it would. I wanted to try something different and it didn’t work. For consumer audio (250 mV line level) I would recommend JK Audio Pureformer, which costs just a few $$ more than this thing — pretty inexpensive for a good audio transformer. Before returning the “hum filter”, I got curious and made some I-V measurements. Here’s what I found (all measurements made between the respective terminals of the plug and the outlet of the mysterious device): hot-hot – 5 milliohms Actually, at first I used an regular ohmmeter, and it looked like the ground had a high resistance, which would make it unsafe, so I used a sourcemeter and got the above (correct) results. This is not a filter at all, and it’s ridiculously overpriced. The good thing is that the diodes can sink at least 3 amps, which is as high as my sourcemeter will go. That’s not enough for a really good ground connection, but at least it’s not obviously unsafe, and if they burn, they will probably just short out. The bad thing is that this won’t always make a difference in terms of noise. What this device does is a sort of “safe ground lift”. So if you have two devices that form a ground loop only though the ground pins of the power plugs, and you power one of then through this thing, then it will work. That won’t always be the case, especially in a complicated setup with multiple signal lines. In some (although probably rare) cases, if there is a leak from the power line to the chassis, this device could make the noise a lot worse. And the possibility of leaks is of course why there is a need for grounding. They write on the package that the device should not be used on an ungrounded outlet, which is true, of course, because then it really won’t do anything. This information is currently not on the product description page on Amazon. This would have lifted the mystery fog a little bit. 0 |
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