Wet carpet under system

Pull up all of the carpet and underpad that got wet, even if only damp. Open up any drywall and structure that got wet and replace anything that could not be dried out immediately. Anything that needs to be salvaged should be treated with an anti-fungal solution to prevent growth of mold. 

Thanks again to all for your responses.
Two industrial fans are now in operation.
Carpet is drying nicely.
Only a part of the room was affected.  Turns out, it didn’t get wet under the gear after all, only adjacent to it.

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.