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Midrange

A term used to describe the mid-range frequencies normally considered to be the vocal range. In speaker terms it is usually… Edit »
Diode

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A diode is a two-terminal electronic device that directs the flow of current. Diodes can… Edit »
High-Pass

A crossover slope that attenuates low frequencies. These are seen at the passive level on tweeters and at the active level… Edit »
lossy-compression

A lossy compression method is one where compressing data and then decompressing it retrieves data that may well be different… Edit »
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Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled… Edit »

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An acronym for Pure Copper by Ohno Continuous Casting.  The purest copper made in the world.  

PCOCC has only 1 crystal and is also known as single crystal copper.  PCOCC is manufactured in Japan and there is only one casting machine in the world that makes true PCOCC.

The history

Standard copper is composed of thousands of individual grains of copper.  These grains can add an electrical barrier that is undesirable for high-end audio and video applications. 

Normal, high purity copper has about 1500 grains in each foot (5000/m). The signal must cross the junctions between these grains 1500 times in order to travel through one foot of cable. These grain boundaries cause the same type of irritating distortion as current crossing from strand to strand.

In 1985, a method for the extrusion of a grain free copper wire was developed by Professor Ohno in Japan.  Known as The Ohno Continuous Casting Method, molten copper is forced out of the mold and very slowly draws the grain down the conductor's length, creating a 'single grain structure'. 

Other types of copper for cables

The first grade above normal high purity copper is called Oxygen-Free High-Conductivity (OFHC) copper. 

The next higher grade is an elongated grain copper sometimes called "linear-crystal" (LC-OFC) or "mono-crystal". These coppers have been carefully drawn in a process that results in only about 70 grains per foot. Cables using LC-OFC have an obvious audible advantage over cables using the same designs with OFHC.

The best copper for cables is PCOCC, because of its characteristics of single crystal, unidirectional, free of impurity, flexible fatigue-resistance, corrosive-resistance, low electric resistance, zero-crystal boundaries and excellent signal transmission ability.

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