M-Audio
M&S Systems
Mach Speed Technologies
Mackie
Macrom
Macsense Connectivity
Magnadyne
Magnasonic
Magnat Audio
Magnavox
Makita
Marantz
Mark Levinson
Marmitek
Martin Audio
MartinLogan
Matrox Electronic Systems
Mattel
Maxon Telecom
Maxtor
Maxxsonics
Mazda
MB QUART
McIntosh
Meizu Electronic Technology
Memorex
Mercedes-Benz
Meridian America
Meridian Audio
Metra Electronics
Metrik Mobile Electronics
Meyer Sound
Micro Innovations
MicroNet Technology
Microsoft
MidiLand
Midland Radio
Miglia Technology
Milwaukee
Minox
Mirage Loudspeakers
Mitel
Mitsubishi Electronics
MK Sound
Monarch
Monitor Audio
Monster Cable
Morphy Richards
Motion Computing
Motorola
MTX Audio
Music Hall
Musica
Musical Fidelity
Mvix