- A Designs
- A&F Drum Co
- AAS
- AB
- ABASI
- Ableconn
- ABLEWE
- AC Infinity
- Access
- Acclamator
- AccSone
- Acer
- Aclam Guitars
- Acme Whistles
- ACON DIGITAL
- AcoustaGrip
- Acoustic
- Acoustica
- Acus Sound Engineering
- ADAM Audio
- Adams
- ADATA
- Addlink
- AEA Microphones
- AER
- Agazarian
- Aguilar
- Ahead
- Ahead Armor Cases
- Ahinsoa
- AIAIAI
- Aiibe
- Air Music Tech
- AirTurn
- Akai Professional
- AKG
- Al Cass
- Alacran
- Alesis
- AlessiVacchiano
- Alexander Reeds
- Alfred
- Alhambra
- Alihelan
- Alisyn
- Allen & Heath
- Allied Music Supply
- Allora
- Allparts
- Alltravel
- ALLWORK
- AlphaTheta
- Alto
- Altus
- Aluratek
- Alvarez
- Amazon
- Amazon Renewed
- AMBER X
- AMD
- American Audio
- American DJ
- American Recorder Technologies
- Amicool
- AmmEicooan
- Ampeg
- Amphion
- Amplivox
- Amprx Power Solutions
- AMTANK
- Analysis Plus
- Andreas Eastman
- ANDYCINE
- Angelbird
- Animals Pedal
- Ankink
- Ansmann
- Antares
- Antelope Audio
- Antoine Courtois Paris
- Anton Breton
- Anton Eminescu
- Aomya
- API
- Apogee
- Applause
- Apple
- Apple Creek
- Applied Acoustics Systems
- Applied Microphone Technology
- Apricorn
- Aquarian
- AQUILA
- Arcolla
- ARCTIC
- Arculus
- ARESGAME
- ARESGAME PC
- Arestech
- AreTop
- Arion Humidifier
- Armstrong
- ARP
- ARP Synthesizers
- ART
- ARTINO
- Artiphon
- Arturia
- Ashdown
- Asher Guitars & Lap Steels
- Ashly Audio
- Astatic by CAD
- Astell&Kern
- Aston Microphones
- ASUS
- Asustor
- ATech
- Atlas Sound
- AUAMOZ
- Audeze
- Audient
- Audiffex
- Audio Innovate
- Audio Modeling
- Audiofly
- Audiomodern
- AudioTechnica
- Audix
- Auralex
- Auratone
- Austrian Audio
- Avante
- Avantone
- Avantree
- Avid
- Aviom
- Avolusion
- AXE MEMORY
- AXIL
- AxLabs
- Aztech
- Azumi