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Post by mattspl on Oct 14, 2024 14:25:53 GMT
Sounds like a good unit Martin. Can I ask where you ordered it from?
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Post by MartinT on Oct 14, 2024 15:01:34 GMT
AliExpress, Matt. It took less than two weeks to get here. The Chinese do have fast shipping nailed.
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Post by mattspl on Oct 15, 2024 17:00:52 GMT
AliExpress, Matt. It took less than two weeks to get here. The Chinese do have fast shipping nailed. Thanks Martin, I’ll wait for your testing before ordering one. |
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Post by stellabagpuss on Oct 15, 2024 17:07:50 GMT
Keep us updated Martin.... interesting
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Post by MartinT on Oct 15, 2024 17:09:24 GMT
I have so far established, beyond the P3's efficacy at noise reduction, that the cyclic mains-borne noise that happens at certain times of the day is real. It wasn't audible last night (just feint radio) but it was audible this morning.
I still have no idea what's causing it.
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Post by stellabagpuss on Oct 15, 2024 18:20:47 GMT
I have so far established, beyond the P3's efficacy at noise reduction, that the cyclic mains-borne noise that happens at certain times of the day is real. It wasn't audible last night (just feint radio) but it was audible this morning. I still have no idea what's causing it. How frustrating... l bet whatever causing the noise is probably chucking out a load of RF interference as well, best trying to keep a time line, and this may help you track down if its a domestic or business user. Your probably aware, but if you do manage to locate the source, and it is indeed banging out loads of RFI you can complain to Ofcom, they will have to knock the door. Another possibility is a vehicle battery charging,the smps chuck out so much rubbish they can actually stop the DAB signal of BBC R2 from being recieved, this happens in our workshop,when the charger on full tilt. l hope you get to the bottom of it. |
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Post by MartinT on Oct 15, 2024 20:30:17 GMT
Indeed, Damien, I still have my beady eyes on the two Tesla superchargers next door. Those green lights that pulse between bright and dim may match the noise levels. I'll have to bring the detector outside so that I can listen while watching the lights.
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Post by julesd68 on Oct 15, 2024 20:54:14 GMT
Lol - you need to "have a word" with them Martin!  |
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Post by stellabagpuss on Oct 15, 2024 21:28:34 GMT
Indeed, Damien, I still have my beady eyes on the two Tesla superchargers next door. Those green lights that pulse between bright and dim may match the noise levels. I'll have to bring the detector outside so that I can listen while watching the lights. Aha... That could be it.. Normally the flatter the battery, the more power is needed the more noise is pushed down the line. Sadly this is the future.. And l know of electric scooters that do exactly the same when running, portable RFI units... The reality is interference is totally overlooked by many countries,and probably isn't a requirement,which is bad news for us,however Ofcom do have the power to do something. l actually think, we will see more of us Audiophiles going off grid in the future,as the sale of electric vehicles becomes more common. And due to the National Electricity lnterstructure not being to cope with the demands, where only going to see more SMPS .... we all doomed 🤣 |
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Post by MartinT on Oct 15, 2024 21:39:31 GMT
Despite the increased noise levels, it doesn't seem to be affecting the music. I was playing some classical music today with a lot of space in the recording and I could still hear deeply into the music with zero harshness. My two regenerators are clearly helping. If the situation were to get worse, a big balanced transformer may have to be on the cards to filter out some of the high frequency hash. We will see.
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Post by stellabagpuss on Oct 15, 2024 21:44:26 GMT
Despite the increased noise levels, it doesn't seem to be affecting the music. I was playing some classical music today with a lot of space in the recording and I could still hear deeply into the music with zero harshness. My two regenerators are clearly helping. If the situation were to get worse, a big balanced transformer may have to be on the cards to filter out some of the high frequency hash. We will see. Well that's great to hear...l think if we knew what all our neighbours were pluging in,we would all break into a cold sweat 🤣 |
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Post by MartinT on Oct 16, 2024 18:34:04 GMT
Now I have some very convincing results to show you. I decided to get to the earliest point in the incoming power to our house, which happens to be a double-socket in the electrical cupboard off the music room, right next to the mini consumer unit for the hi-fi system. Measuring the noise there shows it be be huge in amplitude, as you would expect if it's coming from an external source nearby. I then recorded the effect of a single plug-in filter (the very good Sercal NoNoise SE) on the noise. Watch the video.
Listening to the system now, the difference is small but I can just about hear the lowered noise floor. I think that's testament to how much attention I've already given to noise reduction in the system.
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Post by mattspl on Oct 16, 2024 19:23:37 GMT
That is impressive. Is the Sercal made by Fidelity Audio?
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Post by MartinT on Oct 16, 2024 20:43:15 GMT
That is impressive. Is the Sercal made by Fidelity Audio? It looks like it's been taken over by Fidelity Audio?  The Sercal (Fidelity) and Kemp are the two best noise filters I know. Now the Sercal is deployed at the incoming mains power, and the Kemp in the ring main in the music room, noise levels are the best I've seen in a long time. I remember the exact readings on the old meter and will compare sometime. |
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Post by MartinT on Oct 16, 2024 20:49:02 GMT
The Fidelity Audio NoNoise Ultra SE looks like an upgrade from the above. I may just buy one. -48-p.jpg?v=f53815a9-081b-4b56-b54e-06aebffd7d81) |
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Post by mattspl on Oct 16, 2024 21:16:38 GMT
The Fidelity Audio filters are really good. I use the No noise x SE.
I have a second SNS on the way too.
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Post by MartinT on Oct 17, 2024 8:38:56 GMT
Today I performed a comparison between the Sercal (Fidelity) NoNoise SE and the Kemp SNS, the two best plug-in filters I know. I removed filters from the main incoming double socket, plugged in the LHY noise meter and set the sensitivity to exactly 100, as per the instructions. I then plugged in first the Sercal and then the Kemp to get a relative reading. Results as follows: | No filter | 100.0% | | Sercal NoNoise SE | 1.4% | | Kemp SNS | 1.2% |
So, by a very small margin, the Kemp is the overall winner but both are excellent filters (and way better than cheap ones like Tacima). The trick is to get one in place as close as you possibly can to where mains power enters your house. Then plug another one in the same ring/radial as powers the hi-fi system. |
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Post by MikeMusic on Oct 17, 2024 10:33:19 GMT
Is that physically where the mains enters ?
Other end of the house for me, nowhere near the system
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Post by MartinT on Oct 17, 2024 11:03:21 GMT
Is that physically where the mains enters ? As close as you can get, yes. |
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Post by orange55 on Oct 17, 2024 11:40:43 GMT
The Fidelity Audio NoNoise Ultra SE looks like an upgrade from the above. I may just buy one. I have one of these. They are very good and easy to hear. |
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