Outlet Question

just a note not everyone lives in the same state let alone same country so check your local electrical codes.

Your probably going to want to be in code as your insurance company will definitely hang you out to dry if you have a fire and they find non-compliant outlets in your house. 

Then there is the why bother if your house is only 4 yours old. I don't imagine the current outlets have lost their grip already. main difference to the hospital outlets if higher grip force on the plug, more robust, built to higher standards. Not much difference in the conductors etc.  We don't generally plug and unplug our audio equipment multiple times a day so I don't see the need for them. your value may differ though. 

Ferrous Steel... Just look at an audio grade outlet company's outlet, that have their outlets made to their specs. You won't see any steel used. 

You don't have to spend big bucks for a good sounding outlet. Just buy one that has a non nickel plated brass back strap an non nickel plated brass contacts.

Wow! 🤔🤕🚯

Incidentally and in case anyone might be interested, here’s a rare comparison of several of the more popular “audiophile” outlets.  It’s 10 years old but still interesting/useful today I think.  Note that it includes a cryo’ed (not standard) Hubbell outlet.

https://www.enjoythemusic.com/magazine/equipment/0114/audiophile_ac_outlets.htm

@jea48 

I installed them about 10 years ago , model 8200W  15amp 

purchased from HD Supply , good deals for 10 or more .

The inside is the exact same as the 20 amp , you pay extra for the cover !

I took a 15amp apart and found the 20amp side blade .under the 15amp cover .