Hey, I'm working with onecall to get some Monster Turbines.
I'm deciding between Gold and Copper.
They have offered me the Golds at $215. The Coppers at $259.
Are the coppers worth the additional $44?
Sure, if you like a more extended treble, more detail, a more balanced presentation and no mid-bass hump or bleedover into the mids. The golds are very good, though.
If you want added treble response and detail, and slightly better soundstage then yes. If you want a slightly darker sound with slightly rolled of treble then the Golds will do the trick.
x2 plus the coppers are no wear near as warm sounding as the golds
The opposite of cold sound.
See this post