- Ablelite
- Ableton
- Access
- Acer
- Acoustic Energy
- Adam
- Adam Hall
- ADAMSON
- Akai
- Akg
- Alesis
- Allen&Heath
- Alto Professional
- Amc
- American Audio
- American Dj
- Amis
- Ampeg
- Amphenol
- AMX
- Anzhee
- APart
- Aphex Systems
- Apogee
- Archi light
- Art
- Arthur Forty
- ARTONE
- Arx
- ASD
- Ashly
- AST
- ASW
- Athletic
- Audac
- Audio-Technica
- Audipack
- AVCLINK
- AVID
- AVOLITES
- Ayrton