I have used the un-plated copper IeGo 8055 on many cords. Due to me having a hearing condition known as Hyperacusis, most plated power plugs and receptacles sound too bright to me. One thing that I have found about the copper plugs is that they can have a very forward upper mid-range depending on the cable being used. Also, Lessloss is using the Iego gold ends on their cords.
IeGo Power Connectors
There is very limited info on these connectors on the internet and there is only really a few outlets that sell them. I have heard that these plugs are on-par or better than Furutech and that the owners of the company are ex-Furutech employees. These connectors look like cheap Chinese knockoffs, but is this really so, or are the looks deceiving? They are obviously much cheaper than Furutech.