FeinTech ATG00101 Audio Ground Loop Isolator Filter Suppressor Noise 3.5 mm Jack Stereo Cable, Black

We have a PC feeding our sound desk. The PC line out suddenly developed a nasty background white noise / hum which I initially thought might be a dying pc power supply or sound card. Didn’t think an earth loop would have appeared overnight although not beyond the possible at our venue. Anyway, before changing the sound card and PSU I thought I’d try this cheap little option and it got rid of the hum fantastically. Might be a sticking plaster for now but solves my immediate problem brilliantly.

In testing, this completely eliminated noise from an external USB audio interface.Some testing was performed using a Siglent 200MHz oscilloscope and a Feeltech FY6800 signal generator.Natural transformer resonance is over 200KHz and the audio performance is pretty flat from 20Hz up to way beyond 40KHz, where some peaking starts to occur.Below 30Hz there is some evidence of non-linearity though it is, in fact, better than another unit I tested recently. Crosstalk was also very good, I could not measure any significant crosstalk at 1V in across the full frequency range.Square wave slew rate was exceptional. The output slew rate was better than 1V/us and although some ringing was evident, this was damped with a 1.2K load resistor. Since the ringing is essentially at the transformer resonant frequency it's way beyond the audio bandwidth anyway.Apart from some non-linearity below 30Hz, which is unlikely to be audible, I can't see any reason it would introduce colouration into the signal.Note that despite a review claiming this unit is not a stereo device, this is not correct. It does operate as a stereo isolator.

The media could not be loaded. Excellent little device at a really great price which gets rid of the USB ground loop noise when I connect my USB powered music kit to both my digital audio mixer and my computer.It is a totally passive device i.e. no power is required!It has stereo 3.5mm TRS sockets for input and output and a stereo 3.5 to 3.5 cable is supplied.It is totally transparent to my ears - no attenuation or degradation of the audio passing through it. Just lovely silence when there should be, rather than digital background chatter!I made a video demo for this review of the results with a Korg NTS-1. This shows the noise without this gadget and the lack of noise with it!I'm very pleased and have purchased another 2 units for my other USB powered musical gear.Thoroughly recommended if you're suffering from the dreaded USB ground loop noise.Great value too!

It’s actually works

I bought this because I have a slight humming since moving my speakers such that they have to be plugged into a different socket to my PC. Unfortunately this device made the buzzing _significantly_ worse. I tried it both ways around and with multiple cables, but nothing helped.

I bought this because I use a Macbook Pro and a Windows gaming Pc and my headset is a Corsair Void Pro wireless headset, I connect my Macbook to my Pc via line in socket form my headphone socket on the Macbook so I can use my headset for both Macbook and Pc at the same time, how ever when my Macbook was connected to my dell monitor via usb-c the interference was really bad, plugged in the FeinTech ATG00101 Audio Ground Loop Isolator Filter Suppressor and it silenced the interference completely.I can recommend this device as it worked perfectly for me and was good value to and it allowed me to use my headset for listening to audio on 2 devices at the same time without having to mess about.

I very seldom give a 5 star review but this inexpensive attenuator 'cured' a type of ground loop effect on my car stereo without fuss.My quite old Toyota Yaris Verso had an aftermarket Sony stereo fitted and I noticed a familiar earth-open effect when using an MP3 aux-in player. Radio and CD appeared to be free from parasitic noise and I deduced that earthing (grounding) the AUX could be tiresome as the Sony case is earthed.At this price point it was worth trying the FeinTech even if was just a ferrite bead device with nothing fancy inside. The problem was fully cured straightaway without any degradation of volume or frequency response on most music but needs a slight bass increase in quiet classical music. Just a very small adjustment suffices. Here I an talking about something challenging in that respect such as Bruckner's 5th and some low frequency Nordic music only listened to by people who like a bit of misery in with their '60s to '80s pop blues and electronica. Yes, we exist.Commentators leaving negative reviews mention a variety of electronic ailments and it needs to be stressed that an item in this price range is not designed for analytics, nor will it do anything about phase issues in hi-fi multi-channel rigs. Anyone who uses such ought to know how to phase test and attend to connections on speakers or outlets.Attenuation of loudness and/or the need to adjust EQ can be expected where a product of this sort is used because it addresses current smoothing in a minor way and that is all. Users should be sure to assess the probable causes of their parasitic noises.My audio expectations in a motor vehicle are very different from those I have with 'high end' audio and, as cars become stupidly crammed with electronic 'toys' all getting current through quite cheap ECM components, relays and sub-standard wiring looms, unwanted interference will appear with age no matter how grand the make or what brand name is marked on the 'infotainment' as badge hiring is a sub-trade of some so called respectable firms. Buyer beware.For dedicated home audio use quite a lot of knowledge is needed and can be obtained so there is no guesswork. The exact requirements and limits of expensive audio products are given in manuals and if they are not, do not buy them because they will not last.Just one criticism of this FeinTech product is that the short 3.5 cable jacks are cheap ones and it is worth spending a few £s on a better quality short cable.

Good solid product