Brands
- American Audio
- American Hybrid Technology
- AMG
- Ampeg
- Ampex
- Amphion
- Amplifier Surgery
- Ampsandsound
- AMR
- Amrita Audio
- AMX
- Analysis Plus
- Anedio
- ANK
- Ansuz
- Ansuz Acoustics
- Antelope
- Antelope Audio
- Anthem
- Anthony Gallo
- Anthony Gallo Acoustics
- Anti Cables
- Anti-Cable
- Anti-Cables
- Anticables
- Antipodes
- Antique Sound Lab
- APC
- Aperion
- Aperion Audio
- Apertura
- Apex Hi-Fi Audio
- Apex Hifi
- Apherion
- API
- APL HiFi
- Apogee
- Apogee Electronics
- APPJ
- Apple
- April Music
- Apt Corporation
- Aqua
- Aqua Acoustics
- Aqvox
- Aragon
- Arcam
- Aries
- Ariston
- Ariston Audio
- Ars-Sonum
- Art Audio
- Arte Forma
- Arte Forma Audio
- Arya Audio Labs
- ASC
- Ascend Acoustics
- Ashly
- ASR
- Assemblage
- Astell & Kern
- Astell and Kern
- Astell&Kern
- ATC
- ATI
- Atlantic Technologies
- Atlantic Technology
- Atlas
- Atlas Cables
- Atma-Sphere
- Atmasphere
- Atohm
- Atoll
- Atoll Electronique
- Audes
- Audeze
- Audia
- Audial
- Audible Illusions
- Audience