Passive is a wooden speaker or acoustic amplifier that naturally magnifies the speakers of mobile devices such as smartphones and tablets without the need for electricity.
Sonok wireless wooden loudspeaker on Ekohunters
Wooden passive speaker – cherry wood - Green & Wooden
Passive Wood Speaker - Sweden
Passive Speakers - Rabbi Traders London
Passive Speaker - UK
GLOGLOW Wood Speaker, Passive Wooden Treble Speaker
Buy Passive Loudspeakers by Canton
Buy Passive Loudspeakers by Canton
MONACOR: Built-in speakers for sound system projects
Buy Passive Loudspeakers by Canton