Not really.
The S9E is not 'recent', it has been out for 2 years and for the most part acts the same as all s9's. Loud and hot.

For at least the past 4 years all BTC miners have been the same - LOUD. The reason is simple - they suck a lot of power and need the high speed fans to give enough pressure to force air through them for cooling.

The only way you can throttle them down is through reducing the power they draw by running the miner at lower THs via undervolting/underclocking. Simply slowing down the fans or trying to replace them with quieter ones only results in the miners overheating.

High neutral currents is a common problem when running any sort of non-linear load, in this case, scads of switch-mode PSU's. All of them (not just ones from Bitmain) cause it. For powering large farms, using K-factor rated transformers which are designed to accommodate these loads is a must. Ref this from Jefferson Electric.

Poking around the Jefferson Electric site I do see that they also carry a line of Harmonic Suppression Systems to use with existing distribution transformers and gensets.

All very true but it is still odd to see a cluster of miners with some of them running different speeds. What does not help is that which miner ID is which actual miner will change when a miner restarts on its own (or if you reboot it).

On mistakenly crossing the updates, if you do that a miner can still be accessed and set right. Just isolate the erroneously updated 821 or 841 from the others, apply the correct MM to it and all will be well again.  

Most folks who have a firm grasp on Reality were not welcome there...
Personality, methinks the OP was just a 1st class Troll who picked a prime subject they knew would go the way it did.

Personally, I smoke because I like to. Period.
I often fly overseas, longest flight so far was 28hrs portal-to-portal with most around 18-20hrs, I regularly work in clean rooms and pharmaceutical mfg areas and not being able to smoke at those times has never bothered me at all. Even when I am freely able to smoke I'll often go several days without a cigarette just because I don't feel like it. Nonetheless I average 1 pack a day.

Never once has it bothered me to not be able to smoke. I figure that once it DOES bother me - that is the time to quit.

Yes, the OP can unlock it anytime they want to.

Um, perhaps try reading some it... It is still here The 1st post in it pretty much sums up what the poor deluded OP was thinking (HA!) about. From there they just gassed on & on trying to support their belief and prove that everybody else is wrong.

Love it and definitely interested in a couple as well, no strobe but just lo/hi modes.

I vote for island of Yap Rai stones https://en.wikipedia.org/wiki/Rai_stones

Only place in the Forum I can think of would be the Other > Off-Topic section.

Only problem with that is, the area is quite a cesspool of topics...

Just for the record, max rating on the C19/C20 depends on which is used - International or North America rating - and of course the wire size the cord has.
per Interpower (who makes them)

While personally I'd use the 16A rating, the N.A. rating of 20A does make me feel better about pushing it.

Sound great to me! Hopefully MasterCard and others will follow suit.

I do hope that your friend who bought the miners reported the issue with them to the seller and eBay (though the seller may have been who intentionally did the infection).

What do they have in common - nothing.
However, as in many industries, blockchain tech can be used to verify the source/owner of something. In this case say you make a 3D model of a specific widget and charge for the STL file to it. Blockchain could be used to verify who created the file, owns the rights to it and that the file is unchanged from when it was entered into the blockchain tracking system.

Yes a private database is able to do the same thing but usually does not allow the Public to query it. A distributed (Public) Ledger does let the 3rd parties query it. The only remaining question would be who runs the chain.

Can you run them together? Yes. Should you do that? Not really. Just as with the A721/741 series, the 821 and 841 should have separate controllers.
One reason deals with firmware updates, an update runs on ALL miners attached to a controller and the MM updates are specific to miner type. An 821 does not like thinking it just became an 841... (been there, done that)

The difference is that a neutral (common) is intended to carry power and a ground is intended only for safety in the event a line contacts a metal chassis. Yes both tie together inside the panel but that must be the only place they are connected. It is what makes a neutral, well, neutral with only a small voltage difference (that depends on the load & wire size) between the other end of the wire and any ground you find.

As lightfoot said, older electric dryers and ovens often used to improperly use the ground to give 110v to timer motors & light bulbs. It was only allowed by some local electric codes  because said loads draw very little current so *in theory* the combined neutral/chassis ground *should* have very little voltage difference on it referenced to any nearby water pipes or any other grounded metal.

Of course *in theory* means that it is not always the case so a dedicated neutral is now mandated when a high line system needs a neutral connection to provide lower control or aux power.

Methinks it's Inno's idea of a soft-start circuit? 

Ja or at least continue it here in the existing thread about it.
It has become seriously OT.

^^ Posted to Discord for him to pop in on it. He has talked about this several times there.

No matter what given that all claim to have many many users, why is it so hard for someone - anyone - that uses 3rd party firmware to post proof it has found a BTC block? Most GUI's have a spot for it and a record of blocks found since last reboot  is part of the API so can be checked even outside of the miner GUI.

On the pool side of things, when shares are sent/received information about the miner is provided as well to let the pool/miner work together. Plus when a block is found the block header generated includes information about the actual individual miner that found it. That info is more than just 'running cgminer vxxx'' and is easily logged by a pool if they care to keep detailed logs, for a start is part of the header from the block I found on Dec 16. From what Kano has said, a pool operator can extract more information as well if they care to. It should be common sense to link together miner data with block header info to track performance metrics.

Since Slush is behind the bOS projects, why not provide simple, verifiable proof the stuff finds blocks? They certainly have a large enough data set to see what miners (or, ahem, large proxy) find blocks and compare that against expected finds vs hashrate. So, if responsible pool operators want verifiable proof firmware works - give it to them.

Oh, their Stratum redeux freely gives a pool, sorry - they call it 'Service' -that info and knowing in-depth what a miner is running and can do is a large part of what it relies on to do the voodoo they plan on it doing.

Then there is #xnsub being part of it... While not an issue per se #xnsub opens up a rather large security hole and exists (so far) only for the benefit of Nicehash and DevFee firmware. It is how NH is able to change work done w/o having to restart a miner. It is also used by DevFee firmware to mine at their payment pools in the background without the miner needing to change pools & restart. Yes a lot of miners support #xnsub and yes BM had to reinstate support for it again after folks bitched about not being able to use their newest miners on NH. That still does not make it a good thing...

Um, look at the Kanopool home page. The ban on 3rd party is in big bold red letters and has been a long standing policy for a few years.
A couple reasons for it:
a. Most violate the CGminers' Open Source license by refusing to provide their source code. If bOS provide their code, fine but that still does not address the next point,

b. Despite many requests for it - NO 3rd party firmware provider has ever given*any* proof that the firmware finds BTC blocks nor given any proof of testing for more than it does not crash but does do what they claim (control of clocking, voltage adj, fans etc)