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.
GLOGLOW Wood Speaker, Passive Wooden Treble Speaker
Speaker Retro Wood - Ecophonic
Ecolo Natural Speaker for Phone, Passive Speaker Made of Wood
Passive Wood Speaker - UK
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GLOGLOW Wood Speaker, Passive Wooden Treble
MONACOR: Built-in speakers for sound system projects
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Active Speaker La-210 Two-Wire Array Wood Outdoor Speaker Modern
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Sonok wireless wooden loudspeaker on Ekohunters
Scalable and eco-friendly flexible loudspeakers for distributed
Active Speaker La-210 Two-Wire Array Wood Outdoor Speaker Modern