Is dirty electricity a scam? Anyone with experience on Stetzerizer?

[raffriff42]

That's the thing, I really don't see it mattering much for completely DC electronics (which would include standard computers). So if you try to play a VCR with one leg and your computer capturing the video is on the other leg, it really should not technically matter.

High frequency noise on the AC power can get into the analog portion of your signal, if you are unlucky. I have experienced this at least twice that I can remember: once with a little home recording setup that buzzed whenever the construction site next door powered up their circular saw; later in a large multi-studio post-production environment that had a bad HF spike on its incoming power, that caused a very faint hum bar that nobody noticed for a long time until it was caught by a major client (ouch). Both problems resolved through careful single-point grounding.

[Hoser Rob]

I've worked in electronics, including power distribution systems for half a century and can quite categorically state it is complete bunkum and a scam. The web site is full of technical nonsense, refers to measurement units that don't exist and curious regulations from various places that probably (=shouldn't) exist. Referring to 'Volts per second' is like saying 'feet per cubic gallon'.
Only one part makes sense:

At 60 Hz the filters act as capacitors and normally marginally improve the power factor of the customer load, which are normally slightly inductive.

which reveals what is inside the boxes - a capacitor. You can buy one at a fraction of the cost of one of the filters but in almost every case it will be completely ineffective anyway and in most countries there are laws about permissible 'power factor' limits which would make the filter worsen conditions instead of making them better. For anyone who doesn't understand power factor, as simply as I can explain it: AC voltage and currents change over time, typically cycling through positive and negative peaks either 50 or 60 times a second, power factor is a measure of the skew between the two as in some loads the current may peak slightly earlier or later than the voltage. As power (in Watts or VA) is calculated by multiplying voltage and current together, if the two don't coincide the wrong result is reached, the power factor can be used to correct the figure.

As for eliminating interference on video or audio equipment, unless you have some very serious issues with your house wiring, these things will make no difference whatsoever but might increase your electricity bills.

Brian.

That pretty much nails it. I'd also add that the power supply in any decent piece of gear will reject noise anyway.

[hudsonf]

I bought a foil hat.
https://www.amazon.com/Electro-Deflecto-Unisex-Foil-Size/dp/B01I497JAM/ref=sr_1_2?ie=U...=tin+foil+hats

Money well invested.

[pandy]

That's the thing, I really don't see it mattering much for completely DC electronics (which would include standard computers). So if you try to play a VCR with one leg and your computer capturing the video is on the other leg, it really should not technically matter.

It can be wrong assumption - depend how device (equipment) is grounded and how EMI/RFI suppression filter topology looks - very common issue called https://en.wikipedia.org/wiki/Ground_loop_%28electricity%29 - best is powering devices from same point (so use power bar connected to one wall receptacle ) also plugs must be oriented in same way in power bar (i know in US this is impossible almost but in Europe with Schuko connector type it is common that L and N can be swapped between devices).

[anachronon]

High frequency noise on the AC power can get into the analog portion of your signal, if you are unlucky. I have experienced this at least twice that I can remember: once with a little home recording setup that buzzed whenever the construction site next door powered up their circular saw; later in a large multi-studio post-production environment that had a bad HF spike on its incoming power, that caused a very faint hum bar that nobody noticed for a long time until it was caught by a major client (ouch). Both problems resolved through careful single-point grounding.

This was more likely RF interference being transmitted through the air by the circular saw's motor. Any motor with a commutator and brushes will generate this kind of interference. The interference was likely being picked-up by your cables and circuitry, and not coming through your power cord. Back in the days of analog TV, I had a battery-operated Dremel, that would produce a noticeable whine through both my TV and stereo.

"Conditioned power" is really only needed in critical applications, like hospital equipment. Virtually all modern electronic devices have filtered power supplies and voltage regulators to trap-out line noise. Some folks do use UPS's (Uninterruptible Power Supplies) for their computer equipment. But, these are more to protect the equipment, in areas prone to brown-outs and/or power surges from lightning strikes.

[dellsam34]

That nonsense got me through college and a career in audio (built a recording studio) and video (Hollywood telecine / post-production).

Raffriff42 it's tough to argue with ignorant. Though I don't know why this is in the capturing section.

[super8rescue]

I've had over 40 years doing sound and electrics, the only place I have found noise to be a problem is unbalanced audio running across a theatre stage.
Perhaps back in the 60's the fridge may have caused a click on my reel to reel

Lot of old snake oil.

[Constant Gardener]

Likewise, after half a century of doing battle, just a few problems that weren't solved with a mid-range filtered power bar. Proper grounding, elimination of ground loops, and sometimes a bit of additional shielding took care of the rest. Worst was trying to do a decent audio recording within a hundred feet of a high-power radio-teletype transmitter.