Wet carpet under system

I'm glad none of your equipment was ruined or anyone hurt from any electrical shock. Hopefully you can salvage the carpet and find where the water came in to prevent any future problems. I had a whole finished basement ruined because of water coming in during a hard rainstorm. Good luck in  getting everything cleaned up and back to normal.  

If its rain from leaking into your house because of rising water around your foundation, only flood insurance will cover that. Any pipe leak or roof leak your home owners  insurance will cover that.
call a pro in to fix it. They will know exactly what to do and they will tell you what needs to be replaced

Hope you don't have LP's near that area. The longterm problem is going to be mold. Decades ago part of my record collection was on carpeting that was soaked from an air conditioner that leaked while I was on vacation. 90% of the LP's were ruined within a few weeks (that was before record cleaners). 

You may have to keep an eye on mold in your gear as well, for a while.

As of this morning, everything appears dry to the touch.
I’ll keep the fans running for a while, though.
 Maybe I got lucky.
 We’ll see.