I am really thankful for all your responses. I had the system played overnight, assuming the previous owner did not use it a while and thus requires break-in. This morning, it got a little better, but not at a level that I wish for. There is no loose part, nothing broken.
I don't know the original MSRP on GG cables. For $400 I paid, it's right below at the performance of the Audioquest Opal x3 ($100 for 1m).
As there are many members here rave about GG cables in other threads, may be they would jump on mine's when I list them. I certainly hope that way.
Last but not least, my wife came by my setup last night, and she asked if something is broken in my setup. Well, knowing her is legally tone deaf, that pretty summarize how the GG cables sound in my system.
:-(
P.S. I noticed that MIT Magnum / Shotgun cables have some kind of impedance adjustment switches. May be my GG Revelation 2 has an impedance mismatch? But then again, with numerous cables I used before (Nordost, Cardas, NBS, Wireworld, Pure Note, Audioquest, Ohelback, Kimber, Marigo, MIT, etc etc) none has issue like I have now.