Switching from electrolytic capacitors to film caps has brought the focus on the materials used in the construction of capacitors. Electrolytics can sound poor because the insulator is actually an oxidized plate. Basically a capacitor is two plates separated by an insulator. Film caps allow that form of construction. Using high purity metal foils and Teflon insulators without the need to use a paste to oxidize a plate improves the transmission of a purer music signal.
