ETI Research BP-20C Binding Post (pair)
The ETI Research BP-20C Binding Post is a superb high-performance Binding Post available at an entry-level price. Made from 1100 Series Hardened Copper with an IAC Rating of 102%. You can rest assured the audio signal is not being degraded by having to go through a poorly conductive material such as Brass.
Gold Plated 1100 Series Copper
Brass (Black Finish)
Copper is far superior to Brass in terms of conductivity and as such the BP-20C offers a level of audio signal quality unsurpassed in similarly priced competitor products. If you want a binding post representing outstanding value for money, this is it.
The BP-20C has a Gold Plating applied without any nickel. Many manufacturers apply a nickel surface coating before the Gold Plating as this makes the Gold look shiny. The unfortunate problem is Nickel is a poor conductor and will degrade the Audio Signal!
The Housing is made with Aluminum over a Polymer compound. The Polymer threads onto the Post so as to not have any conductive material touching the Pure Copper. The Aluminum is great at rejecting EM/RF noise that is so prevalent nowadays.
Also, you have the choice of securing the wire by either screw or solder. The Post length is 20mm, which is the preferred length for Chassis mounts or in certain Speaker Back Plates.
The Nut used to secure the BP-20C is made from a high-density non-conductive Polymer, so no conductive material touches the Copper Post, except what is needed to transfer the Audio signal.