But in each of those, particularily Sony, audio kit is only a part of their business, so they have breadth instead of numbers (or brands).
Harmon:
AIR – a cross-platform runtime system for building desktop applications and mobile applications
AKG – microphone/headphones
AMX – video switching and control devices
Arcam – high end home audio – amplifiers and audio components
AXYS Tunnel – Amplifier for public tunnel
Bang & Olufsen Automotive – car audio
Becker – car infotainment
BSS Audio – signal processing
Crown International – pro amplifiers
dbx – signal processors
DigiTech – guitar products
HALOsonic – Noise Management Solutions
HardWire – guitar pedals
Harman Kardon – home/car audio
HiQnet – control network for digital audio equipment, supporting communication over TCP/IP, USB and RS232
Infinity – home/car speakers/headphones
JBL – home/car speakers & amplifiers, professional speakers, headphones
Lexicon – digital processing
Mark Levinson Audio Systems – home/car audio
Martin Professional – stage and architectural lighting and effects fixtures
Revel – home/car speakers
Selenium – home, car and professional speakers, amplifiers, sound tables/mixers
S1nn GmbH & Co.
Soundcraft – mixing consoles
Studer – mixing consoles, sold to Evertz Microsystems 2021[32]
Voxx International:
808 Audio
Acoustic Research
Advent
Audiovox
CarLink
Champ
Chipmunks
Code-Alarm
Directed Electronics
FlashLogic
Hirschmann
Incaar
InVision Technologies
Jamo
Jensen Electronics
Klipsch
Magnat
Onkyo
Prestige
Pursuit
PursuiTrak
RCA
Surface Clean
Terk
Zentral Home Command
Not sure where Onkyo goes.
dave