Audiophile Grade Wall Receptacle

@mitch2  In summary, I agree with @mijostyn, the Hubbell 8300 provides excellent grip of the plug blades, which is one of the two most important jobs of the outlet (grip and conductivity) ... If I were in the market for outlets, I would probably purchase the Hubbell 8300 and be done....

And here is the spec. of Hubbell 8300.  I scratch my head why there are so many folks recommend this particular receptable while its power-contacting material is primarily brass - 25-30% of thermal conductivity of copper.  And you know steel is worse.  Why why why, ask bud dry...

... pure copper ac power receptacle make the sound sound mellow and warm, give you the ultimate musical experience.

The Monosaudio audiophile duplex receptacle insulation shell is made up of 65% nylon and 35% glass fiber, with high flame retardant coefficient. Mixing materials like this also makes the sound cleaner and clearer.

Monosaudio Audiophile power outlet is Four layer electroplating process Oxygen Free Copper Plating, Silver Plating, Plating, 24k Gold Plated Plating improves smoothness, fineness and rhythm, provides better transparency and layering, and makes the sound range wider.

Problem solved.  I have no idea before that power outlet can be used to tune the system, folks.