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Class D amp kills my streaming connection

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Posted on April 20, 2023 at 19:32:31
gortnipper
Audiophile

Posts: 866
Location: Seattle expat in Auckland
Joined: November 28, 2003
 I have a TP-link power line adapter, which has worked well in my granny flat I use as a home office. That is, until I added a subwoofer with a class d plate amp to my desktop audio system (an old NuForce Icon2 with some Tannoy monitors) which I stream via Roon from my music server attached to my audio system in the main part of the house. Turning on the sub kills the connection between the TP-link and the house. I can watch it die.

I have tried a lot of things: lifting the ground, running the sub on a different outlet, a different circuit, running the sub behind an isolation transformer, running it in all these scenarios completely disconnected from any other part of the system. All fruitless: simply turning on the sub kills the TP-link connection to my router.

Any ideas on how to rectify? I would really like to have some bass with my music... but I need the internet in my office.


 

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Guessing that class D amp is kicking back a whole bunch of..., posted on April 20, 2023 at 20:29:26
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
 high frequency crap back onto the power line that is killing the high frequency data encoded by the TP-link deices.

Maybe use some form of filtering on the AC of the sub or maybe try different outlets for the sub, perhaps one running on the other phase as 120VAC is sometime split between phases of 240VAC coming into the house?




First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

RE: Guessing that class D amp is kicking back a whole bunch of..., posted on April 20, 2023 at 20:36:01
gortnipper
Audiophile

Posts: 866
Location: Seattle expat in Auckland
Joined: November 28, 2003
 We run 240v here in NZ, so cant pull the other leg like I could in the US.

Tried other outlets, behind a isolation tx.

What other sort of filter might work?

 

Ferroresonant power coditioner or Power regenerator, posted on April 21, 2023 at 13:14:45
Jon L
Audiophile

Posts: 6065
Joined: April 6, 2000
 In situations like this, the only thing that will actually completely stop pollution back into power grid are ferroresonant power conditioner or double-conversion on-line power generators. Fancy audiophile isolation transformers or conditioners with bunch of caps, etc, will not do the job IME.

Cheapest way is probably a used ferroresonant line conditioner and stick it between your sub and power outlet.

Downside is many ferroresonant units make their own little buzzing noise, and most double-conversion units use fans (which can be switched out for quiet ones).

Personally, I would just investigate a good wi-fi extender that does not transmit over the powerline.

 

Have you tried..., posted on April 21, 2023 at 16:53:04
mlsstl
Audiophile

Posts: 1079
Location: Midwest
Joined: September 1, 2015
 ...experimenting with the physical distance between the subwoofer and the TP-Link? Noise can be transmitted over air as well as through the power line. However, noise over air decreases at an inverse square rate with distance, so if this is the issue, it might not take much distance to solve that problem. Another experiment would be to put the TP-Link on a different outlet further away and run a longer CAT-5/6 cable. If either of these work, at least you have a basis to start with in reconfiguring your setup.

 

RE: Class D amp kills my streaming connection, posted on April 22, 2023 at 05:02:35
Doublej
Audiophile

Posts: 678
Location: Boston
Joined: January 11, 2009
 You could try a different brand of powerline adapter.

 

Yup., posted on April 23, 2023 at 13:52:03
gortnipper
Audiophile

Posts: 866
Location: Seattle expat in Auckland
Joined: November 28, 2003
 Long extension cord, different outlet circuit. No help.

 

RE: Class D amp kills my streaming connection, posted on April 23, 2023 at 16:48:58
AbeCollins
Audiophile

Posts: 46302
Location: USA
Joined: June 22, 2001
Contributor
  Since: February 2, 2002
What brand / model sub is it? I have a pair of Class D subs that appear to be well behaved in that they haven't interfered with anything.



 

Run a cable, posted on April 24, 2023 at 06:03:39
Daveslater
Audiophile

Posts: 1044
Location: UK
Joined: June 11, 2003
 I'm an old fashioned IT guy and have always found a cable connection is the best sure way of getting an Ethernet connection. Is it too dificult to run a cable? Perhaps outside the house and back in or to a location that moves the TP Link well away from the Class D Unit.

Or change the amp of the sub to kill the noise at source.

 

Exactly. If at all possible....., posted on April 24, 2023 at 08:49:50
AbeCollins
Audiophile

Posts: 46302
Location: USA
Joined: June 22, 2001
Contributor
  Since: February 2, 2002
 Unlike Wifi RF in the air or RF over the AC power mains, Ethernet is much easier to troubleshoot and it's more reliable. It generally either works or it doesn't. RF is less predictable and problems much harder to troubleshoot as the OP is discovering.

In our previous home, I ran an outdoor rated UV resistant CAT5E Ethernet cable from the main level down into the basement level where I had my home office.

I used a long drill bit to make a couple holes through the walls, one up top and one below all the way through the outer and inner wall. Pushed a straightened coat hanger through the wall, taped the CAT5E to the hanger and pulled it through the tiny hole - x2. Terminated each end from inside the house with RJ45 plugs and sealed any gaps around the cable on the outside wall. This setup lasted for years with zero issues until we moved.

When our new home was under construction I specified at least one RJ45 network jack in each room and had the cable bundle converge down to the basement structured wiring panel where it all comes together with nearby router, switches, NAS, and UPS.



 

RE: Guessing that class D amp is kicking back a whole bunch of..., posted on April 24, 2023 at 15:05:52
Doublej
Audiophile

Posts: 678
Location: Boston
Joined: January 11, 2009
 You could try one of these and see what happens.

 

RE: Class D amp kills my streaming connection, posted on April 27, 2023 at 13:24:22
gortnipper
Audiophile

Posts: 866
Location: Seattle expat in Auckland
Joined: November 28, 2003
 I built a bucket sub for the office and another pair for behind my 604s in the house. The ones in the house work great powered by a Crown 1502 (though the Crown is a bit noisy).

The bucket sub in the office is powered by Yung SD300 300W Class D Plate Amplifier. I am pretty sure it is the culprit, and I have just been trying to workaround it. I need to move the Crown to my office to test that, just havent gotten to it. I am pretty sure I will preplace the Yung with something else, but we may be moving soon so it may be moot anyway in a few months.

 

RE: Class D amp kills my streaming connection, posted on April 27, 2023 at 13:43:50
AbeCollins
Audiophile

Posts: 46302
Location: USA
Joined: June 22, 2001
Contributor
  Since: February 2, 2002
Some Class D amps are "cleaner" than others. I had a pair of NuForce monoblocks several years ago. They would completely wipe out my FM reception and here's the odd part.... Those amps would also wipe out a few CableTV channels.

The amps were in the same AV rack as my CableTV box. When I called NuForce about it they told me the speaker wires on the amps could be acting as antennas radiating noise from within the amps. Those Class D monoblocks were wonderful sounding but I couldn't live with them in the AV setup.



 

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