WAlembic Inc
WAltec Lansing
WBang & Olufsen
WBehringer
WBGW Systems
WCopland (company)
WDaniel Hertz S.A.
WDevialet
WEcholette
WElectro-Harmonix
WGjika Amplification
WICEpower
WJBL
WK-array
WLipinski Sound
WMackie
WManley Laboratories
WMark Levinson Audio Systems
WMarshall Amplification
WNAD Electronics
WOnkyo
WPass Labs
WPeavey Electronics
WPioneer Corporation
WQuad Electroacoustics
WRega Research
WRenkus-Heinz
WRotel
WSherwood (company)
WTraynor Amplifiers
WV-Moda
WVoodoo Amplification
WWard-Beck Systems
WWatkins Electric Music
WYorkville Sound