Here's a list consisting of old school car audio manufactures from 1970's all the way to mid 1990's. If you have any missing, please post here
A.D.S.
Adcom
Advent (Jensen)
Aiwa
Alphasonik
Alpine
Altec Lansing
American Hi Fi
Ample Audio
Anaba
Annhilathor
Arc Audio
Atomic
Audio Art
Audio Control
Audio Gods
Audio Mobile
Audiotek
Audiovox
Audison
Autotek (BTS, Mean Machine, Street Machine, Stealth)
Avalanche
Baja (Profile)
Bazooka
Bear Audio
Blade Technologies
Blaupunkt
Boston Acoustics
Bostwick
Butler
Cadence
California (Profile)
Caliber
Carver
Cerwin Vega
Clarion
Cliff Designs
Cobalt (Orion)
Concord
Coustic
Craig
Crossfire
Deltasonik
Denon
Diamond Audio
Dr. Crankenstein
E.S.X.
Earthquake of San Francisco
Eclipse
Fujitsu Ten
Fultron
Furi
G&S Designs (Predator Series, Competition)
GBL
GodFather (M&M)
Granite (Soundstream)
Hafler (Rockford Fosgate)
HiFonics (VI,VII,VIII,Gen X, Industria)
Hitachi
Holywood SounLabs
Illusion Audio
Image Dynamics
Impulse (Kicker)
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker (Stillwater Designs)
Kove
Kraco
L.A. Sound
Lanzar
Legacy (Pyramid)
Linear Power
Linear Series
M&M
Majestic
Mb Quart
McIntosh
MEI
Memphis
Mitsubishi CVX
Mobile Authority
Monolithic
Morel
MTX (Terminator, Blue Thunder, Road Thunder, Black Gold)
Nakamishi
Optimus (Radio Shack)
Orion
Oz Audio
Petras
Phase Linear
Phillips Sound Labs
Phoenix Gold
Pioneer
Polk Audio
Power Acoustics
Precision Audio
Precision Power
Profile
Proton
Pyle Driver
Pyramid
Radio Shack
Rane
Realistic (Radio Shack)
Road Warrior (HiFonics)
Rockford Fosgate (Series 1, The Punch, Power)
Rodek
Sansui
Sanyo
Sapphire (Phoenix Gold)
Savard
Sedona (Precision Power)
Sentrek
Sherwood
Silverado (Autotek)
Sony
Sparkomatic
Spl (Profile)
Super Pro (Pyramid)
Targa
The Crunch
The Hott Set Up (Orion)
Thump
Toshiba
Urban Audioworks (Targa)
US Acoustics (Alphasonik)
US Amps
USD Audio
Volcano
Xtant
Yamaha
Zapco