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DAC/Amplifier combos
Audioart — CSE — Devialet — JAI Ltd. — JohnBlue — Lead Audio — Monrio — Signal Path International — Strategie Informatique Et Audio (SIEA) — Stein Music — Studiosound.
Companies that have made DAC/Amplifier combos in the past
Bakoon Products.
DAC/Preamplifier combos
Auralic — Drawmer — Insectopia Trust — Jade Design — Stella Inc. — Strategie Informatique Et Audio (SIEA)
See also: Headphone amplifiers.
Hi-fi amplifier manufacturers
Abacus Electronics — Abbingdon Music Research — Acousticimagery — Acoustic System International — Advance Acoustic — Adyton — Akamai Audio — Alner Hamblin — Analog Domain Audio — Antonino Pistone (Pre-amps only) — Amplification & Recording, Cambridge — Argos — Array — Aspen Amplifiers — Audioart — Audio Oasis — Audio Technology Switzerland — Audio 4 & C — Auralic — AVM — Bakoon Products — Bridge Audio Laboratory — Båsund Audio (Power amps only) — Betetec Industries — BG Radia — B. M. C. Audio — Buffalo Electronics — Bully Sound Co. — CAD Audio DK — CEVL — Chris Swinson — Conrad Electronic — Constellation Audio — Copenhagen Design Labs — Crayon Audio — C.T.E. srl. — D'Agostino LLC — Daniel Hertz — Deltec Precision Audio — Eastern Electronics — Engelholm Audio — Enrico Ricciardi — Ensemble — Exemplar Audio — Fadel Art — Fiderikkusu K. K. — First Sound Inc. — Fonel — Francis Chaillet — F. T. M. Marketing Limited — Gato Audio — Guy Hammel (Preamps only) — Harmony Design — High End Unterhaltungselektronik — Holborne — Insectopia Trust — International Audio Group — Innovative Industry Solutions — ISEM Audio — ITOK Media Ltd. — Jade Design — Jan Brassány — Jaton — Karan Acoustics — Klinger Favre — Kraske Electronics AG — Lipinski Sound (Power amps only) — LV Lautsprecher Vertriebs (Preamps only) — Magnet Audio — Maiken-Mia Holding Ltd — MFB s.r.l. — ModWright Instruments — Monrio — Nelson Chung — Nissha — Nonsolomusica — NuForce — Opal Electronics — PBN Audio — Progressive Audio — PureAudio — Red Wine Audio — Sanders Sound Systems — Sercal Electronics — Signal Path International — Sintron — SL Audio — Sonodyne — Sound of East Audio — Soundsmith — Spec Corporation — Spectron — Spemot — Stein Music — TacT — Talk Electronics — Technical Brain — Technology Science & Art — Teddy Pardo — Telefunken — Tellurium Q (Poer amps only) — Tibo — Tom Evans Audio Design — Trinnov Audio — Venture — Witch Hat — XTZ — 47 Laboratory.
Desktop and mini amplifiers
Abacus Electronics — Centrance — Jay Hennigan — Kenwood — Sintron — Tachai — XTZ.
Desktop amplifiers/DAC combis
Audionord.
Companies that have made or sold hi-fi amplifiers in the past
Acoustic Preference — Acoustic Reality — Alpha Ecology Solutions — Amstrad PLC — ATRON — Audioanalyse — Audionord — AVI — Caversham Trading — Ceratec — Clarity Vision — Delphi Design — Deltec Precision Audio — DPA Digital Limited — Fisher Radio — Harvard International — Hervic Electronics — Iskra — Jennings Research — Kenwood — Kenwood Electronics Inc. — Kinshaw Electronics — Kudelski — Mirror Image Audio — Monogram Professional Audio — Panasonic — Randy L. White — Sonophone Electronics — Unitra — Victor Co. — White Audio Labs Inc. — Yamamura Churchill.
AV/multichannel amplifiers & recievers
Amplification & Recording, Cambridge — Audio 4 & C — Crestron Electronics — Electrovision — Fonel — Kenwood — Panasonic — Verastarr — .
Companies that have made AV/multichannel amplifiers in the past
Audionord — International Audio Group — Sonophone Electronics — Tara Labs — Victor Co. — Wo Kee Hong.
Multichannel power amplifiers
Amplification & Recording, Cambridge — Audio 4 & C — C.T.E. srl. (Valve) — Earthquake — Jade Design — Jaton — High End Unterhaltungselektronik — Magnet Audio — Procella Audio — SoundVision Technologies — TacT.
Companies that have made multichannel power amps in the past
Acoustic Reality.
Companies that have made surround sound decoders in the past
Mike Moffat Labs — Panalogic — Victor Co. — .
Multichannel preamps and HT processors
Amplification & Recording, Cambridge — Jade Design — SL Audio — Sound & Music Distribution — Strategie Informatique Et Audio (SIEA) — TacT.
Companies that have made mutichannel preamps in the past
Mike Moffat Labs.
Multichannel amplifiers (Multiroom and other non-AV applications)
Amplification & Recording, Cambridge — Hanser Music Group — Jade Design — Pacific Sound & Signal Inc. — WirePath Home Systems.
Companies that have made multichannel amplifiers in the past
ClearOne.
Stereo & mono installation amplifiers
Pacific Sound & Signal Inc..
Subwoofer amplifiers
Ceratec — SoundVision Technologies — XTZ.
Valve based hi-fi amplifier manufacturers
Abbingdon Music Research — Absoluta Sound & Space — Aesthetix — AKRAM — Almi SRL — APL Hi-Fi — Art Audio — Attila Audio — Audio Access (Hong Kong) — Audio Alto — Audiomat — Audionics Lab — Audiopax — Audio Power Labs — Audio Technology Switzerland — Audio Tekne — Audio 4 & C — Audolici — Auris Audio — AVM (Hybrids) — Beyond Frontiers Audio (BFA) — Convergent Audio Technology — Century Audio — CSE — C.T.E. srl. — Deja Vu Audio Ltd. — Doshi Audio — Fonel — Foshan Chancheng Yaqin Sound — Gill Audio Design — Ian Schneller — Jade Design — Jan Brassány — Jasmine — JohnBlue — JJ Electronic — John Yoon-Sung Park — Kinetic Audio Technology — KR Audio Electronics — Kryna — Kyodo Denshi Engineering Co. — Laboga — Laboratoire d'Acoustique et d'Electronique — Living Sound — LUA — MadoTec — Magnet Audio — MF-Electronic — ModWright Instruments — Moscode (hybrids) — Nanotec Systems — Otono-Edison — Ozval Audio (Pre amps only) — Phase Style Ltd. — PPJ Acoustics Studio — Pure Sound — Red Wine Audio — Response Audio — Robert Evans — Robert Koda — Roger A. Modjeski — SAC Thailand — S. I. Audio — Signal Path International (Hybrids) — Sintron — Tatic Audio — Trafomatic — Triology Audio Systems — Unison Research — Veloce Audio — Venture — Vexo — Wo Kee Hong — Woo Audio — Yakov Aronov — Yoshiba Onkyo — Ypsilon Electronics.
Companies that have made valve hi-fi amplifiers in the past
Ahrens Audio — Bob Carver LLC — CQ Audio — ENG Vista — Fatman — Fisher Radio — Iskra — Kenwood — Kenwood Electronics Inc. — KR Enterprise S.R.O. — Grant Amplifiers — Grant Lumley — Kudelski — Mutine — Panasonic — Parmenter Sound — Randy L. White (Hybrids) — Silvaweld Audio Lab. — Silverline Audio — Stein Music — Vaic Audio — Victor Co. — Yakov Aronov Audio Lab Inc. — Yamamura Churchill — Yamamura Systems S.R.L..
Passive pre-amplifiers
Alner Hamblin — Amtrans — Array — CSE — Guy Hammel — Jan Brassány — Kyodo Denshi Engineering Co. — Nelson Chung — Otono-Edison — SAC Thailand — Seiden — Ypsilon Electronics.
Companies that have made passive pre-amplifiers in the past
Audionics Lab — CEVL — Howland-West — William C. Seneca.
Amplifier modules
Lead Audio — PMC.
Room correction devices and loudspeaker controllers
SL Audio — TacT — Trinnov Audio — VLSI Solution — XTZ.
Buffer amplifiers, linedrivers, isolation transformers and other line level signal processors
Abacus Electronics — BSG Technologies — CSE — C.T.E. srl. — Foshan Chancheng Yaqin Sound — Insectopia Trust — Spec Corporation — Takman Electronics.
Companies that have made crossovers in the past
Acoustic Reality — Bakoon Products.