High fidelity is the high-quality reproduction of sound. It is popular with audiophiles and home audio enthusiasts. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat frequency response within the human hearing range.
An audio power amplifier amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones. Audio power amplifiers are found in all manner of sound systems including sound reinforcement, public address, home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers.
Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts. The electrical power delivered to the loudspeaker, together with its efficiency, determines the sound power generated.
McIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment headquartered in Binghamton, New York. It is a subsidiary of McIntosh Group, which is under the ownership umbrella of Highlander Partners, a Dallas-based private equity firm.
Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components.. Its best known product was the ST-70 tube stereo amplifier. They also manufactured other tube and solid state amplifiers, preamplifiers, radio tuners and bookshelf loudspeakers. Dynaco was liquidated in 1980, and the trademark is now owned by Radial Engineering Ltd.
Roksan is a British manufacturer of high fidelity audio products for domestic use, based in Rayleigh, Essex. It is best known for its influential and innovative design for hi-fi equipment, and in particular its Xerxes platform for playing LP records.
Bowers & Wilkins, commonly known as B&W, is a British company that produces consumer and professional loudspeakers and headphones. The company was founded in 1966 by John Bowers in Worthing, West Sussex, England. In October 2020, it was acquired by Sound United, a holding company who owns several other audio brands.
QUAD Electroacoustics is a British manufacturer of hi-fi equipment, based Huntingdon, Cambridgeshire. QUAD is part of the IAG Group, with corporate headquarters located in Shenzhen, China.
Amphion Loudspeakers Ltd. is a Finnish company that manufactures home loudspeakers and professional studio monitors. It was founded in 1998 by Anssi Hyvönen, and in 2023 it had 17 full-time employees. Amphion's turnover in 2022 was 3.5 million euros. Their acoustic design and product range has received many awards and accolades, and its line-up includes passive speakers, bass extenders, amplifiers, and a newly introduced active monitor One25A.
Musical Fidelity is a British producer of high-end audio equipment focusing on streaming music players, and its core product range of amplifiers of various types. Other products have included headphones, Digital-Analog Converters (DACs), CD players, Bluetooth Receivers, ‘all-in-one systems’. Founded in the United Kingdom in 1982, they are known for their unusual industrial design, Nuvistor tube use and Class-AB amplifiers.
Phase Linear was an audio equipment manufacturer founded by Bob Carver and Steve Johnston in 1970. While primarily known as a power amplifier company it also produced several innovative preamplifiers, tuners and the Andromeda loudspeaker.
A bass amplifier is a musical instrument electronic device that uses electrical power to make lower-pitched instruments such as the bass guitar or double bass loud enough to be heard by the performers and audience. Bass amps typically consist of a preamplifier, tone controls, a power amplifier and one or more loudspeakers ("drivers") in a cabinet.
Nelson Pass is a designer of audio amplifiers. Pass is vocal that listening tests remain valuable and that electrical measurements alone do not fully characterize the sound of an amplifier. Pass holds at least seven U.S. patents related to audio circuits.
Crown International, or Crown Audio, is an American manufacturer of audio electronics, and is a subsidiary of Harman International Industries, which has been part of South Korea-based Samsung Electronics since 2017. Today, the company is known primarily for its power amplifiers, but has also manufactured microphones, loudspeakers, and a line of commercial audio products, as well as digital audio networking products.
Sonodyne Technologies Pvt. Ltd. is an Indian electronics company based in Kolkata, India, founded in the 1970s by Ashoke Mukherjee. It specializes in audio equipments, amplifiers, speakers and active speakers. Their studio products division operates in over 40 nations. Sonodyne currently operates 2 research labs, in Kolkata and Mumbai. Sales and project offices are located in Mumbai, Bangalore, Delhi and Kolkata. Two design centres and three manufacturing centres are located in Kolkata, West Bengal and Mumbai, Maharastra.
Tube sound is the characteristic sound associated with a vacuum tube amplifier, a vacuum tube-based audio amplifier. At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable methods were not known or used. After introduction of solid state amplifiers, tube sound appeared as the logical complement of transistor sound, which had some negative connotations due to crossover distortion in early transistor amplifiers. However, solid state amplifiers have been developed to be flawless and the sound is later regarded neutral compared to tube amplifiers. Thus the tube sound now means 'euphonic distortion.' The audible significance of tube amplification on audio signals is a subject of continuing debate among audio enthusiasts.
Slew-induced distortion is caused when an amplifier or transducer is required to change output, i.e. slew rate, faster than it is able to do so without error. At such times any other signals may suffer considerable gain distortion, leading to intermodulation distortion. Transient intermodulation distortion may involve some degree of SID and/or distortion due to peak compression.
The NAD 3020 is a stereo integrated amplifier by NAD Electronics, considered to be one of the most important components in the history of high fidelity audio. Launched in 1978, this highly affordable product delivered a good quality sound, which acquired a reputation as an audiophile amplifier of exceptional value. By 1998, the NAD 3020 had become the most well known and best-selling audio amplifier in history.
A professional audio store is a retail business that sells, and in many cases rents, sound reinforcement system equipment and PA system components used in music concerts, live shows, dance parties and speaking events. This equipment typically includes microphones, power amplifiers, electronic effects units, speaker enclosures, monitor speakers, subwoofers and audio consoles (mixers). Some professional audio stores also sell sound recording equipment, DJ equipment, lighting equipment used in nightclubs and concerts and video equipment used in events, such as video projectors and screens. Some professional audio stores rent "backline" equipment used in rock and pop shows, such as stage pianos and bass amplifiers. While professional audio stores typically focus on selling new merchandise, some stores also sell used equipment, which is often the equipment that the company has previously rented out for shows and events.
U-Turn Audio is an American audio equipment manufacturer located in Woburn, Massachusetts. The company was established in 2012 by Benjamin Carter, Robert Hertig, and Peter Maltzan. Its primary products are turntables, phono preamps, and loudspeakers.
