Brands
- BPT
- Brodmann Acoustics
- Bryston
- Burmester
- Burson
- C.E.C.
- C3 Audio
- Cabasse
- Cabledyne
- Cairn
- California Audio Labs
- California Audio Labs (CAL)
- Calyx
- Cambridge
- Cambridge Audio
- Cambridge Soundworks
- Canare
- Canton
- Capriccio
- Cardas
- Cardas Audio
- Carver
- Cary
- Cary Audio
- Castle
- Castle Acoustics
- Celestion
- Centrance
- Cerwin
- Cerwin Vega
- Chang Lightspeed
- Channel Islands Audio
- Chario
- Chord
- Chord Electronics
- Chordette
- Cinepro
- Clarus
- Clarus Crimson
- Class D Audio
- Classé
- Clayton Audio
- Clearaudio
- Clearwave
- Clones Audio
- Cocktail Audio
- Coda
- Coincident Technology
- Conrad Johnson
- Conrad-Johnson
- Constellation Audio
- Control4
- Coph Nia
- Corpse Cable
- Counterpoint
- Creek
- Creek Audio
- Crestron
- Crimson
- Crimson Electronics
- Critical Mass Systems
- Croft
- Croft Acoustics
- Crown
- CryoParts
- Crystal Cable
- Cullen Cable
- Curious
- Custom Power Cord Company
- Dahlquist
- Dali
- Dan D'Agostino
- Darwin
- Datasat
- David Berning
- Dayens
- Dayton Audio
- DB Audio Labs
- dB Technologies
- DBX