PNG ICO ICNS MORE
Mobile apps
Glyph
app types in grey
Audio, player, sound
Black
512x512
blogger, speaker, blog
DarkSlateGray
PNG ICO ICNS SVG MORE
UI
Google Material Design icons
speaker
speaker, Notes
Amplifier, Strike, volume
Mixed
Geomicons
volume, speaker
Windows 8 metro style
Music & multimedia
Sound and Audio
speaker, plus, volume
hardware, speaker, Audio
off, volume, speaker
speaker, volume, Minus
medium, speaker, volume
volume, Loud, speaker
WPZOOM Developer Icon Set
Social media
Win8 and iOS Tab Bar Icons - free
vintage, volume, radio
60x60
Pittogrammi
speaker, volume, sound
sound, speaker, volume
Business & finance
Devine Icons Part 2
128x128
Flat UI Icons Free
music, sound, speaker
Picol Vector
off, speaker
speaker, Louder
speaker, silent