Noise. That damned demon you may not even know about...

[Kingrex]

. if i ever build another room i will have another Equi=tech wall panel system.

Depends on where your listening room is. If inside a residence, all branch wires going through or behind a wall need to be AFCI protected. There is no AFCI listed and labeled to operate on a "Balanced" power line. So its not going to be a permited installation.

Its possible you could put the transformer in your listening room and run cables in surface wireways to outlets. You might get away with that. Or use a Torus. Those can be configured with AFCI output breakers.

 

[Mike Lavigne]

Depends on where your listening room is. If inside a residence, all branch wires going through or behind a wall need to be AFCI protected. There is no AFCI listed and labeled to operate on a "Balanced" power line. So its not going to be a permited installation.

Its possible you could put the transformer in your listening room and run cables in surface wireways to outlets. You might get away with that. Or use a Torus. Those can be configured with AFCI output breakers.

the Equi=tech came with GFI's on each branch inside the Wall Panel unit. i had the contractor replace them with a straight wire to reduce noise. he did it since there is no water inside the room and it's a semi-commercial specific use installation with no children using it. and i have a separate 'dirty power' circuit and outlets inside the room with GFI's.

but i understand the difference if my next room is inside the residence. at this point unknowable.

 

[microstrip]

I agree with you Wil. But he needs all 4 tools your are using. Not just a scope. The scope is too limited. It does not tell you RF and EMI also.

We just need an USB soundcard (less than $200) and some software.

And surely a life insurance is advised if we do not know how to deal with mains power ...

 

[microstrip]

(...) and it's possible i might have different amps by the time you are ready to do it. and those new amps run mostly class A so need a bit more juice.

In fact, class A amplifiers should be less dependent on mains supply. They drain a constant current, so they do not cause mains voltage fluctuations due to music dynamics, except if you run them so loud they enter class B.

 

[microstrip]

From what you have shared with me, you are measuring with a
Alpha Lab EMI meter
Entech for RF
Shure Test for Current
And a Fluke scopemeter for THD and low level harmonics.

That is a pretty good set of inexpensive tools that will give you a good general idea what issues you are experiencing. The Alpha Lab and Entech are not that accurate. Sort of a shot gun approach. They tell you if noise is there. Just not what the actual frequency of the noise is. But, how granular is the consumer trying to get. If you know you have noise, and you plug in a filter, your going to be able to retest and see if the noise is gone. That is all we really want to know .

Unfortunately the EMI and RF tools you refer are inadequate and can be very misleading, triggering us in false conclusions. Not very different from the scientist and the frog.

At some time in the past I had access to a decent RF spectrometer, but their current price is around $3000 ... The Siglent SSA3032X‑R or even better the Tektronix RSA306B are my dream on the subject.

 

[Kingrex]

We just need an USB soundcard (less than $200) and some software.

And surely a life insurance is advised if we do not know how to deal with mains power ...

Would you share the software you use?

 

[Holmz]

I don't understand what you mean with the voltages on A, B, C. Chassis Voltage???

I thought you were Iran and using European 240 volt on a single phase leg. Or do they use Split phase 120/240 like the US and Canada?

US is like push-pull - so it is like an XLR for power.
The rest of the world is single ended, so it is live and return.

 

[microstrip]

Would you share the software you use?

SpectraPlus - you can use the complete demo version for 30 days.
https://www.spectraplus.com/

 

[microstrip]

I don't understand what you mean with the voltages on A, B, C. Chassis Voltage???

Probably leakage chassis voltage measured with a floating ground.

I thought you were Iran and using European 240 volt on a single phase leg. Or do they use Split phase 120/240 like the US and Canada?

Iran has the same type of power as most Continental Europe - 230Vac .

You could also be suffering from Peaks and Sags. Sags will suck the power out of your system. Atmasphere was talking how a few volts under 120, like say 117 diminished the power supply in an amp by like 25% or some insanely large number. A isolation transformer can not help that. Only a UPS, Regenerator or Battery/Inverter can. The UPS has to be configured properly also. It can pass through sags, swells and noise also. Only when it goes into backup power and uses the battery and inverter is it offgrid. Otherwise its on grid waiting for an extreme event where it needs to click into safe mode and use the battery for a short period of time.

I have looked into Pure Power and talked to a few people. Oddly a few said an older model that was very small sounded best. The larger models were not as good sounding. I did not understand why that might be at the time.

Without proper diagnostic, all we can do is speculating.