- Ablelite
- Ableton
- Access
- Ace Audio
- Acer
- Acoustic Energy
- Adam
- Adam Hall
- ADAMSON
- AdMark
- AET
- Akai
- Akg
- Alctron
- Alesis
- Allen&Heath
- Alto Professional
- Amc
- American Audio
- American Dj
- Amis
- Ampeg
- Amphenol
- AMT electronics
- AMX
- Anzhee
- APart
- Aphex Systems
- Apogee
- Archi light
- ARCTIK
- Art
- Arthur Forty
- Arthur Holm
- ARTONE
- Arx
- ASD
- Ashly
- AST
- ASTON MICROPHONES
- ASW
- Ateis
- ATEN
- Athletic
- Attero Tech
- Audac
- AUDINATE
- Audio-Technica
- Audipack
- AVA LED
- AVCLINK
- AVID
- AVOLITES
- Ayrton