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Just picked up a Trifield line EMI monitor and got these readings:95.2 mVp-p (bottom)
221.1 mVp-p (peak)The numbers jump up and down non-stop. Is this normal?
The manual says <50 mVp-p is what I need to shoot for for low noise application. What am I supposed to do now? I can hear hum when I get close to the speakers near my equipment rack. Time to pick up a PS Audio Powerplant? I doubt a run of the mill electrician will able to "fix" this line issue as long as I get normal AC power from the outlet.
Thanks.
Edits: 07/31/22 07/31/22 07/31/22 07/31/22 07/31/22Follow Ups:
Would an Isolation Transformer help?
Too much is never enough
Something as basic and cheap as a hifi Audio AC iPurifier might work wonders. You could try a couple!
Buy AC line conditioner.
No need for a PowerPlant, get a Panamax or a Brick Wall.
Edits: 08/06/22
but I had to buy the Panamax when I was having so many problems here with the power line AC voltage swings here where I live.
I noted highs of 140 at night and 110 during hot days. They have since changed things out somewhere at a substation and its a much better 127/110 now going into the Panamax. But here's the weird thing about the Panamax -
I was hearing a very low level ear to the speaker hum from my electrostats with all amps unplugged, everything off, so I ran a separate AC line out of the wall into them and it was gone. I now plug them into a separate APC and it's ok now. Funny thing is I don't have any other hum problems from anything else with ear right up to the speakers. It does its job very well otherwise.
At the time the Panamax was about 750 bucks. It would be worth a visit to John Risch's website or other places to find alternatives. I clicked on his website just now but got some king of warning
Good for you! You actually measured to see if you have noise. I looked it up to see what documentation they might provide. The "hash" you are seeing (or hearing) can probably be addressed with a couple X and Y rated capacitors. There is a line filter tweak worked out by Jon Risch that works well to neutralize much of this and RFI. You can find it on his web site linked.
Another inmate, Al Sekela, had posted what he was doing using only X & Y rated capacitors. You'll have to dig as there are many posts to go through using the search.
If you want to understand what is going on and have some knowledge of electricity look up "capacitive reactance".Added: I was looking and saw this in the "Trader".
https://www.audioasylumtrader.com/ca/listing/Power-Conditioner-Surge-Protector/EconoTweaks/D.I.Y./Parallel-AC-Filter-Board-CRYO-39-ED/118751Added II: maybe something as simple as this? Have you looked to see your equipment is already equipped with something like this.....
It sucks to get old. It really sucks to get old and bitter.
Edits: 07/31/22 07/31/22 07/31/22 07/31/22 07/31/22 07/31/22
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Funky Bob,
I haven't seen this model before, but I used to do line noise analysis with a hi pass filter and diode detector connected to a little radio shack amplified speaker. Plugged in to an AC receptacle, I could hear every chop saw and vacuum cleaner in the neighborhood!
Have you listened to the noise with your Tripath box? what does the EMI sound like?
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...how many houses are hooked up to your street transformer?
When I first moved into my house, the previous owner had one transformer on the pole for only him, he was a lieutenant cop. AC voltage was fairly stable. H Sandy did a bunch of damage to the neighborhood, and I lost it. Now I contend with 2 other houses on one transformer, and voltage variance has been complicated. Any electric cars recharging will only make it worse. The noise variance you are measuring is most likely due to your immediate neighbors and also things in your house.
I'm in a new community with about 10 houses on my street at the minimum plus a couple of Teslas. I have nothing but my rig in my listening room (only analog plugged in at the time of measuring). Is PS Powerplant the only solution to correct this line noise issue?
PS Audio just sent out an email that says all of their Power Plants are on sale. The base model P3, which is aimed at smaller systems, is discounted by 33%. Give them a call and see if they've got something that will work for you.
You never know how much crap is riding on the AC line coming into your house until it's gone. Call PS Audio, talk them about which model you might suit your needs, ask about their trade in policy if you've got some gear that you can do without, and then ask about their thirty day trial period. PS Audio has sales on most of their gear once or twice a year if you are patient.
I bought their P3 regenerator for my rig and haven't regretted doing so.
A PS power plant (regerator) should help. It will clean up most of the crap in the power lines, and keep your voltage constant. I've got one, and it's probably the best investment I've made in my system. There are other brands of regerators out there, but I don't know anything about them. Get one large enough to handle your needs.
Jack
I've seen mention of other noise only devices. Is any noise audible thru your system?
I got minor hum on my tube amp and it's audible through the speakers at close distance. I got it down to near inaudible level with this Hum X device.
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