I get the same wrong CPU speed reported by LatencyMon. As the others have said, ignore it. 
 

Every time I heard the crackles I grabbed headphones to see if the noise would be there, too. As luck would have it, the crackles ceased before I could get them plugged in. And now it's been many hours and I haven't heard them since I moved my speakers. I'm wondering now if I have a bad cable. Unfortunately, I only own two such cables (TRS -> XLR) so I have no spares to substitute.
 
Much as I love the band, it turned out I could not handle an hour's worth of Dream Theater at one sitting. After a while I turned it off and went back to making some music of my own. 
 
Thanks for the confirmation, Steven. Given that this is the first version of LatencyMon that's compatible with Windows 10, I'm not surprised there'd be a few wrinkles to iron out. I've simply disabled the "CPU Sanity Check" in LM's options, since I've already determined via HWMonitor that my CPUs are not overheating. 

bitflipper
However, if anyone thinks of something I haven't tried yet, I'm all ears.
 

I would take your DAW out of the picture and try some other, simpler signal source.

Not sure if it's coincidence but my crackles stopped after changing the bit depth from 16 to 24 in the windows properties window for my focusrite 6i6 (2nd gen) . Right clicking sound icon task bar,I think in advanced settings(not on laptop right now)
John
 

Sometimes just changing your interface's settings does indeed "fix" problems, by forcing a buffer flush and re-initializing the driver. I've had all audio abruptly disappear from the system before; if that happens I just change the buffer size - doesn't matter to what - and audio returns.

It a bummer when these things happen, and more of a bummer when it's intermittent. 
Makes it real hard to track down. 
 
I have had a noise in my system for  a long while and narrowed it down to my ancient Yamaha P 2100. 
But it took me a while to determine this as like you, the noise came and went. 
I just found a 1978 Technics Integrated Amp so all is much better now. I didn't realize how bad the old amp had gotten till I put the Technics in line. 
I sure hope it's a cable and not your new speakers. 
Did you try wiggling the cables? 
Take the ends apart and look close with a magnifier for a stray wire strands or suspicious connections. 
I had crackles from cables where just one tiny copper strand was not soldered and just barely touching the wrong pin. 

My noise still hasn't returned. All I did was physically swap my speakers to see if the problem followed the speaker. The noise went away and is still gone. This does make me suspect cables.
 
Coincidentally, I recently had a microphone "break", a presumably indestructible and nearly-new SM-58. I was certain it was the mic because I tried a different '58 and it worked fine through the same cable and PA channel. I pedaled on down to my local music store and bought another one, plugged it in and it sounded great. End of story, right? Well, no. For grins I re-connected the "broken" mic and to my surprise it sounded fine!
 
Why did the "broken" mic now work? I can't be certain. I did remove the XLR connector from it to inspect for broken wires or cold solder joints, found no problems and put it back together. I suppose it's possible that simply disassembling and reassembling the mic could have done something.
 
But another commonality occurred to me: both the microphone cable and the speaker cables are the same brand, and were bought from the same source. They would both have the same XLR connectors and were likely both assembled in the same Chinese factory. Could these cheap cables have intermittent problems? I'm going to be pursuing that line of inquiry next.

bitflipper
But another commonality occurred to me ...

it's the same ears listening, isn't it ??? 
 
 

I have never ruled out cables since the day this happened.
Guy comes into my store and wanted to buy a new Bass because his sounded like crap. 
So I took it out of the case and plugged it in to a little Yorkville bass amp and it sounded fine. 
He said wow, what did you do. I looked in his open case and saw a coily cable, when we swapped cables his bass sounded muddy and like crap. 
Well I could have sold him a new Bass but he would have come right back the next day the minute he used his cable. 
 
I sold him a nice Rodam cable for $15. He really wanted a coily cable but I had now converted his thinking. 
Rodam is now out of business but they used Beldon and switchcraft and I still have all my cables for that era and very seldom do they need a re do. So if I need a new cable these days I try and find Beldon wire and Swicthcraft ends. 
There is also Mongami and Neutrik. 

bitflipper
But another commonality occurred to me: both the microphone cable and the speaker cables are the same brand, and were bought from the same source. They would both have the same XLR connectors and were likely both assembled in the same Chinese factory. Could these cheap cables have intermittent problems? I'm going to be pursuing that line of inquiry next.

 
Could be. I like to get expensive cables just to prevent issues like that. I mean Monoprice is great and we use them a lot at work for computer cables, but occasionally one of them has an issue. I don't want issues so I tend to buy Bluejeans cables as they are overbuilt to a massive extent. The money spent is so I don't have to deal with cable issues.