Copper or silver could protect well against electric noise

but unfortunately

compact enough to house a back loaded bass horn loading a wide range 8″ driver

Russian birch plywood that is stronger and denser than ordinaryMedium-density fiberboard (MDF) is used to gain lower resonances for better acoustic performance

RSA-M99 reproduces a beautiful sound　like a genuine musical instrument

ETI Research Brio XLR Female / Hunstik Stik:Venstre Copper or silver could protectThe new ETI Research Brio XLR Connector is an advanced step for ETI as it has taken some time for CNC machining to get to the point where the female connection can be machined to the thickness ETI Research knows is optimum for the finest sound quality possible. CONDUCTOR Rhodium Plated Tellurium Copper HOUSING Brass (Black Finish) For some time, XLR connectors with some type of Copper have been available, but many of the male pins have too much mass,