The ETI BP-20C are very high performance terminal blocks at contained prices. Made of 1100 Series Hardened Copper conductor with 102% IAC (conductivity index), these terminals provide an audio signal that will not be degraded.
In addition, the BP-20C has a gold plating, applied without the use of Nickel. Indeed, if many manufacturers use Nickel before gold plating in order to offer greater brilliance on contact, this also has the effect of reducing conductivity, and therefore the quality of the audio signal.
On the structure side, these terminal blocks are adorned with an Aluminium body and Polymer rings. The Polymer ring allows to have no conductive material in contact with Copper and Aluminum is an excellent material to reject EM/RF noise that could disturb the signal.
Nothing could be easier to assemble. If it is of course possible to fix your cable by welding, the BP-20C also offers a screw fixing system for greater ease of assembly.
ETI opts here for a 20mm long post, a length often adapted for mounting on a chassis but also on some speaker plates.
The nut used to fix the terminal blocks is made of a high density non-conductive polymer, so that no conductive material touches the copper post, except your cable.