Internet Noise: A Pest in the Machine

I have already posted a glowing review of my new Synthesis A100 Titan integrated amplifier, which is my favorite of the many amplifiers I have owned over the years. I hope to keep it as the centerpiece of my system for many years to come.

With that said, I am having an issue that is not only perplexing to me, but to the importer and dealer as well. The gist of it is that I am getting intermittent noise (sort of a gauzy static sound) that seems clearly associated with my internet set-up, which consists of a basic ethernet switch and a couple of smaller switches, with an audiophile-grade ethernet cable running from the switch to my Aurender N20. Except for the ethernet cable, everything else is basic stuff our internet service provider brought for the install.

The importer suggested moving the router (it is actually an access point) into another room, suggesting that sometimes the tubes in the Synthesis will pick up noise from nearby routers, and also suggested moving the streamer as far from the amp as possible. Moving the router did seem to help some, and at times the system is blissfully quiet. But the noise always comes back, with varying degrees of volume.

I have pretty much ruled out the streamer as a potential cause by disconnecting the sources (streamer and phono stage) to see if the noise continued. And it did. But every time I disconnect or turn off the internet by unplugging it, the noise immediately goes away. I can listen to my analog rig with no noise with the internet disconnected, but not for long when my spouse or children complain about not having internet. When I turn the internet back on, the noise will usually come back within a few minutes.

It may be that the answer is investing some money in an audiophile switch—or even something better than the cheapo plastic TP-link switch I have now—but before I go down this road, I need to be relatively confident that this is the issue. I don't want to invest a lot of money and be back at square one.

Another possibility is moving the switches and cables into the next room, far away from the system, and just running a single, lengthy ethernet cable into the room to connect to the Aurender. Maybe the amp is picking up noise from the cables or switches, though that seems unlikely. On the other hand, one day when the noise was particularly bad, I went over and just tried jiggling the cable coming in from outside where it enters the house, and for some reason, that really helped. I have no idea why, or what is going on here. It is just bewildering.

If anyone has a theory or suggestion for troubleshooting this problem, I would appreciate your thoughts. The dealer has been no help at all (he also didn’t know that amp is manual bias) and the importer has offered suggestions but seems as baffled as I am as to what might be happening to cause this.

It is the strangest problem I’ve encountered in twenty-plus years in high end. I would be more than relieved to get to the bottom of it.




Try turning off the wireless 2.4 and 5GHz if it is enabled in your router.  If that solves the interference, you could manually select different wireless channels in the wireless settings of your router and see if that helps.

TP-Link is pretty cheap stuff.  You could try a better quality router from a store with a good return policy.  The router could be giving off 

A while back I had a similar problem, and it was finally resolved when I noticed the ground inside the cable entrance enclosure on the side of my house…  was disconnected.  I connected it securely and my issue went away.  Might not be your issue, but worth checking. 

I have a similar issue. Static noise in the system, and with 106dB sensitive horn speakers let me tell you it is sometimes unbearable. It comes and goes, sometimes it is juts faint, sometimes it's unbearable.

I want to try a couple Ifi Audio AC iPurifiers, see if it does anything, then I will know it comes through AC. If it doesn't help, then I will know it enters from another point in the system.

But yeah, my house is full with devices that have the ability to produce nasty pollution: Internet router with a second remote router for the wi-fi to reach the rest of the house, smart lamps that are remote controllable from my phone, and then the upstairs neighbors are an office full with computers and a big server. there's no way I can isolate or turn them off, so I will try to stop it from getting inside the system. Easier said than done!

Thanks for the continued feedback and shared experiences. Just for some added context, I have not had these noise issues with other amps, especially solid state amps. It is not that I think the Synthesis is to blame, not at all. But the tubes appear to be picking up this pollution and it is almost surely related to the internet, since when I disconnect it or unplug it, the noise vanishes.

I will be experimenting more in the days to come and following up on some of the suggestions made so far.


I feel your pain. It has taken me a couple of months to trace the problem down to the relationship between the internet and the amp. I initially thought it had to be faulty tubes or a something going on with the amp, but after much trial and error, it seems the issue is figuring out how to tame the internet noise.