Stax Ltd. (有限会社スタックス Yugen-gaisha Sutakkusu) is a Japanese company that makes high-end-audio equipment. Stax is best known for their electrostatic and electret headphones, which they call “earspeakers.” Electrostatic headphones work similarly to electrostatic loudspeakers, but on a smaller scale.
Japan is an island country in East Asia. Located in the Pacific Ocean, it lies off the eastern coast of the Asian continent and stretches from the Sea of Okhotsk in the north to the East China Sea and the Philippine Sea in the south.
A company, abbreviated as co., is a legal entity made up of an association of people, be they natural, legal, or a mixture of both, for carrying on a commercial or industrial enterprise. Company members share a common purpose, and unite to focus their various talents and organize their collectively available skills or resources to achieve specific, declared goals. Companies take various forms, such as:
High-end audio is a class of consumer home audio equipment marketed to audiophiles on the basis of high price or quality, and esoteric or novel sound reproduction technologies. The term can refer simply to the price, to the build quality of the components, or to the subjective or objective quality of sound reproduction.
Stax Ltd. was founded in 1938. Twenty-two years later, in 1960, Stax released their first electrostatic earspeaker, the Stax SR-1.Over the following thirty-six years Stax produced a variety of amplification, earspeaker, tonearm, CD player, DAC, phono cartridge and loudspeaker products. In 1995, fifty-seven years after the company’s foundation, it became insolvent. The company was revived in 1996 as the new STAX company. In December 2011, Chinese loudspeaker manufacturer Edifier announced the acquisition of 100% equity in Stax.
China, officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around 1.428 billion in 2017. Covering approximately 9,600,000 square kilometers (3,700,000 sq mi), it is the third or fourth largest country by total area. Governed by the Communist Party of China, the state exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities, and the special administrative regions of Hong Kong and Macau.
Edifier is a Canadian-Chinese audio manufacturer that produces speakers, music systems, and headphones for personal & home entertainment.
As of January 2016, the current Stax product lineupconsists of nine electrostatic earspeakers, five electrostatic amplifiers and accessories for these products including extension cords and a headphone stand.
Eight current models of earspeaker are based upon Stax’s classic “Lambda” design. These are the SR-207, SR-307, SR-407, SR-507, SR-L300, SR-L300 Limited, SR-L500 and SR-L700.
Two models are of small-sized in-the-ear earspeaker type. The SR-003 is terminated with a standard “Pro-Bias” plug and is designed for use with a standalone electrostatic amplifier. The S-001 MK2 is terminated with a proprietary plug and is designed for use with its matching battery powered electrostatic amplifier for use as part of a high end portable audio system.
One model, the 4070, is a closed back electrostatic earspeaker, primarily targeted at studio and broadcast application.
Stax’s flagship earspeakers are the SR-009 (a model in the “Omega” series), which has an MSRP of $4,450 in the United States.Its predecessors are the SR-007 and SR-007A.
There are two different bias voltages for Stax earspeakers. The first earspeakers have a 230 volt bias, referred to as “Normal” bias. The later earspeakers have a 580 volt bias, referred to as “Pro” bias. The Normal bias earspeakers use a 6 pin plug, while the Pro bias ones use a 5 pin plug, which is like the 6 pin plug with one pin not present. Pro bias (5 pin) earspeakers can be plugged into a Normal bias (6 pin) socket, and will work with a limitation to maximum volume. Normal bias earspeakers cannot be plugged into Pro bias sockets since the bias voltage is too high. All current Stax earspeakers are Pro bias, as the last Normal bias earspeaker went out of production around 1992.
Headphones traditionally refer to a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear. Headphones are also known as earspeakers, earphones or, colloquially, cans. Circumaural and supra-aural headphones use a band over the top of the head to hold the speakers in place. Another type, known as earbuds or earpieces consist of individual units that plug into the user's ear canal. A third type are bone conduction headphones, which typically wrap around the back of the head and rest in front of the ear canal, leaving the ear canal open.
A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connectors typically used for analog audio signals.
The XLR connector is a style of electrical connector, primarily found on professional audio, video, and stage lighting equipment. The connectors are circular in design and have between three and seven pins. They are most commonly associated with balanced audio interconnection, including AES3 digital audio, but are also used for lighting control, low-voltage power supplies, and other applications. XLR connectors are available from a number of manufacturers and are covered by an international standard for dimensions, IEC 61076-2-103. They are superficially similar to the smaller DIN connector range, but are not physically compatible with them.
A DC connector is an electrical connector for supplying direct current (DC) power.
A banana connector is a single-wire electrical connector used for joining wires to equipment. The term 4 mm connector is also used, especially in Europe, although not all banana connectors will mate with 4 mm parts, and 2 mm banana connectors exist. Various styles of banana plug contacts exist, all based on the concept of spring metal applying outward force into the unsprung cylindrical jack to produce a snug fit with good electrical conductivity. Common types include: a solid pin split lengthwise and splayed slightly, a tip of four leaf springs, a cylinder with a single leaf spring on one side, a bundle of stiff wire, a central pin surrounded by a multiply-slit cylinder with a central bulge, or simple sheet spring metal rolled into a nearly complete cylinder. The plugs are frequently used to terminate patch cords for electronic test equipment, while sheathed banana plugs are common on multimeter probe leads.
Line level is the specified strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, television sets, audio amplifiers, and mixing consoles.
IEC 60309 is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes". The maximum voltage allowed by the standard is 1000 V DC or AC; the maximum current, 800 A; and the maximum frequency, 500 Hz. The ambient temperature range is −25 °C to 40 °C.
Mains electricity by country includes a list of countries and territories, with the plugs, voltages and frequencies they commonly use for providing electrical power to appliances, equipment, and lighting typically found in homes and offices. Some countries have more than one voltage available. For example, in North America most sockets are attached to a 120 V supply, but there is a 240 V supply available for large appliances. Often different sockets are mandated for different voltage or current levels.
The term All American Five is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s until the early 1960s. By eliminating a power transformer, cost of the units was kept low; the same principle was later applied to television receivers. Variations in the design for lower cost, shortwave bands, better performance or special power supplies existed, although many sets used an identical set of vacuum tubes.
A headphone amplifier is a low-powered audio amplifier designed particularly to drive headphones worn on or in the ears, instead of loudspeakers in speaker enclosures. Most commonly, headphone amplifiers are found embedded in electronic devices that have a headphone jack, such as integrated amplifiers, portable music players, and televisions. However, standalone units are used, especially in audiophile markets and in professional audio applications, such as music studios. Headphone amplifiers are available in consumer-grade models used by hi-fi enthusiasts and audiophiles and professional audio models, which are used in recording studios.
Quad Electroacoustics is a British manufacturer of hi-fi equipment, based in Huntingdon, England.
AS/NZS 3112 is the harmonised Australian and New Zealand standard for AC power plugs (male) and sockets (female). The standard is used in Australia, New Zealand, Fiji, Tonga, Solomon Islands, Papua New Guinea and several other Pacific island countries. The International Electrotechnical Commission (IEC) "world plugs" Web site calls this plug Type I.
An automobile auxiliary power outlet in an automobile was initially designed to power an electrically heated cigarette lighter, but became a de facto standard DC connector to supply electrical power for portable accessories used in or near an automobile, directly from the vehicle's electrical system.
Technical specifications and detailed information on the valve audio amplifier, including its development history.
Constant-voltage speaker systems refer to networks of loudspeakers which are connected to an audio amplifier using step-up and step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables. They are more appropriately called high-voltage audio distribution systems. The voltage is constant only in the sense that at full power, the voltage in the system does not depend on the number of speakers driven. Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, or 100-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products being simply labeled with 100 V.
The BRAUN LE1 was the first electrostatic mode loudspeaker available on the German hi-fi market. German electronics company Braun started production in about 1959 with the technology licensed from the British Acoustical Manufacturing Co. Ltd..
The Quad Electrostatic Loudspeaker (ESL) is the world's first production full-range electrostatic loudspeaker, launched in 1957 by Quad Electroacoustics, then known as the Acoustical Manufacturing Co. Ltd. The speaker is shaped somewhat like a home electric radiator curved slightly on the vertical axis. They are widely admired for their clarity and precision, but known to be difficult speakers to run and maintain.