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No I agree with Jason, although I have not tested it. However there are a number of wall wart devices that you plug into a duplex receptacle which are supposed to help reduce noise everywhere, or in the adjacent plug. Based on reviews I have a few of these around the house. I haven’t done any detailed testing. At some point I found it just isn’t worth testing personally.
It should, as the these pieces are designed to take a "dirty" incoming signal, and send out a "clean" one. The "clean" signal it sends out goes to your gear *AND* back to the outlet/duplex, hence a "clean" duplex (theoretically a whole circuit). The effect will *not* be as strong on the duplex (or circuit), but you should get a little bump.Cheers!
The purpose of the module type power conditioner is to clean the AC line from the receptacle to the service panel. That includes both duplexes which are connected.
Often, multiple modules are used in separate duplexes to reduce noise on other lines which will meet at the panel. This will have an cumulative effect.
A line power conditioner is plugged into a receptacle, it's function is to reduce noise from the mains to all components which are plugged into this unit. It is only cleaning the AC for your audio system, it does not send a cleaned return signal to the panel.
There are so many different power conditioners, each with it's own unique design.
The Puritan PSM156 or PSM136 will do this. It filters out over the air signals like WiFi, cellular, and Bluetooth. It also filters out noises from DC, compressors, and switch mode power supplies. It is incredible. If you are in the Chicagoland area this store lets you try before you buy. https://holmaudio.com/
They also have the Guardian power plug filter.
My understanding is that the EP -2050 (https://store.acousticfrontiers.com/products/environmental-potentials-ep-2050) and perhaps the modular devices operate by serving as the preferred conduit for the noise in the signal. The EP-2050 functions in a similar way for surge protection. Any backwash, RFI, etc. that makes it to the distribution point (panel/outlet) Is essentially siphoned off preferentially, making it unavailable to other lines on the same circuit. This would be all circuits on the main panel for the EP2050 and the other outlet in the duplex for the modular device.
I would think the line conditioner would serve as the preferred conduit in my case, leaving a cleaner signal to the other outlet.
The EP-250 looks like a good device, although I have no knowledge of its performance.
I’m not sure you fully understand the benefit of this device. There is no preferred conduit, this power conditioner/surge protector "cleans" the noise in all the circuits at the panel. This includes dirty power from outside and noise which has been generated within the house (appliances, furnace). So, noise in all lines is reduced, possibly a modular conditioner is not needed.
The line conditioner plugs into a receptacle and starts its "cleaning" at this point. All components will have less noise and SQ should be improved.
The other receptacle in the duplex is being cleaned by the EP-250 conditioner. The line conditioner serves only the one receptacle, and it is only cleaning the components plugged into it.
A Richard Gray’s Power Company will have its full effect when plugged into the other receptacle.
Let me describe an unusual application of a Power Company: I was living in an old house that had several 120 volt window air conditioning units. The compressor was going bad on one unit, such that it would trip the circuit breaker every time it tried to cycle on. I didn’t feel like buying a new air conditioner at the time, as we were moving soon, so I plugged a Model 400 unit into the other receptacle. The compressor tripping was ELIMINATED, but returned soon as I unplugged the Power Company. So it remained in place until we moved,
I’m not an expert on everything that’s available in the world of power conditioners, but I bet there aren’t many that could do THAT.