Best RCA female output connector.....a CD player ?

Consider the Ensemble Synergia connectors (which we are importing from switzerland). They offer 3 times higher conductivity through all copper center contact with direct gold plating and Teflon insulation. Cost is $22 each.

WBT has the best RCA female connectors.

S23chang: What do you base your comment on about the WBT female RCA's ? Sean
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I've used them in my system compared to Vampire, Cardas, radio shack brand, and Tiff.
I'm only referring to female chasis mount because I'm not a big fan of their male plugs.
If you look at the specs, the WBT uses more pure copper than most of the female RCA plugs(99.98%copper center and 68% copper for the ground return.) Their gold plating is also better than most(5 layer). The construction is also stronger than the most(bigger and thicker with good teflon insulation ring.)
Aside from all these fancy descriptions about the specs and physical description, it does give better definition in high and low frequency extension and very clean sound overall.
As I said, I only evaluated in my 4 amps and 4 preamps.
I have not tried other fancy plugs mentioned above by some other folks.
For their topline 201, IMHO, it's as close as to solder directly to the system. It's $38 a pair.

I think the purity does make a difference. I compared the male plugs I found the similar results too.

Definitely agree with Sean. The Op-Amp replacement will make a bigger difference than replacing female RCA mount. If I were you, I wouldn't bother with replacing female RCA mount.
I've replaced my CD player Op-amp and it's really day and night difference. However, it does change the tonal quality too. It will not sound the same as your previous op-amp. It's either you like it or you don't. I've put sockets in place so that I can switch to different op-amps without de-solder and soldering again.
You can search diyaudio on CD player clock mods and op-amps mod.