I have SPL Phonitor XE.
They are pretty Good. Fast and transparent and full of power.
Best partners with preamps.Able to present the flavor of different preamps and doesn’t mess up.
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Ever had a problem with it blowing up your headphones?
I usually turn down the volum before switch headphones as rule.
Couse I have blown up engouth headphones and IEMs. Not through these thou.
And
If you’v got preamps hooked.
That won’t happen, mostly.
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That would be what we call: user error.
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So how do you avoid blowing up your headphones?
Mainly by using speakers. lol
But on headphones. Amps are turned off when plugin / de-plugin.
Expect mobile devices. Haven’t blown (giggidy) any headphones.
It is a design oversight compensated for at the users end.
Should have ditched the single ended.
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Yes but still. They should be used as instructed since that how it is. At this point.
“what, where?” i did not read anything or even if i did, did not understand. lol
Even if RTFM is vital to safe operation, why isn’t either of these
prominently displayed in the box?
Also: The fact greater than 40V are put out the front would require a “high voltage” label if used in a professional setting.
lol
Well to me it obvious but i think you are smart enough to figure the answers or where to get the information if you really want to. 
I guess i can do that. I’m used to just pulling and plugging the headphones into my sp200 whithout a second though. Its gonna be a little hard to change that habit
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Well, you’ll be fine if you use balanced, just get used to it if you have anything using the 6.35mm output.
4-Pin XLR Locks well so there’s no way to short it just by moving it, but a badly shaped/sized 6.35mm (Quarter Inch) Plug will probably mess up your amp to some capacity. Maybe avoid using those stick on 3.5mm to 6.35mm adapter and instead use something that screws on.
Just stick to 4-Pin XLR Balanced though if you’re worried you’ll short the amp, either way mute it before pulling out the plug, but Balanced will allow for some amount of user error if you forget (Hopefully).
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I’ve done it once- remove the jack with music playing, not blown out headphones.
A very loud pop and crack followed by temporary deafness, followed with forehead smacking and saying “stupid, stupid, stupid!”
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You have to use the same care with the Neve, though it is lower voltage.
They include a warning inside the box, if I remember correctly, about powering the unit down.
Yeah, I’ve done that too. Lol. You hear a ghost version of the last bit of music you were listening to. This is the caps discharging? I dunno.
Not as jarring as the SPL, but still probably not a good idea. I actually just leave the RNHP 90% of the time.
Want to hear about any more of the dumb things I’ve done?
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There are very few things I do not hot-plug.
The warning label is specific in the way that it is “consult manual before operating equipment”.
To me it is not obvious a headphone amp can not handle or even endangers the users health when hot plugging the single ended connection.
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PSA: if you want to feed a tube buffer or pre-amp to this unit, that’s fine and you will be pleased to hear tube goodness of some variety added to your sound, just remember to give your tubes ample time to warm up before sounding up whatever variety your Phonitor is.
You should always warm up tubes no matter what equipment you are working with but just be warned snaps, pops, hisses and whatever else your average tubes do before they are warm enough are particularly nasty coming at you through a Phonitor, fair warning friends and happy listening 
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Haha. Perfectly reproduced and amplified pops and hisses. Fair warning!
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Well you like to live dangerously and i do not. lol
Think it is rule for me from car-audio. There are numerous cases from relating that you should not hot-plug signal cables or others cause it can damage the head unit / or other and it has. No mention in manual back then. Still you might “break” the unit’s and no warranty if they notice.
So full off or power disconnect fully.
True they could design things differently. But Since it is what it is, you use it like it should be used. very simple. it is unlikely to change for few that cry. Buy something else if not wanting to use it like it should be used. information of gear you buy before hand is gold.
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Usually the datasheets are competently layed out as follows:
Page 1: Component name, revision, spec sheet version/date (sometimes index)
Page 2: Warnings/use parameters
Page 3: Storage and use conditions
Page 4: Index (if not on front page)
Hot plug is the standard. HDMI, SATA/SAS, RS-232, power, etc. are all hot plug.
USB is the only common interconnect I use that is not hot plug.