What Is the Internal Structure of a Passive Speaker?

Passive speakers are speakers without built-in power amplifiers and require external power amplifiers to drive. Since there is no power amplifier inside, what are there? The internal structure of passive speakers mainly includes speaker units, passive filters, cabinets and connectors.

The speaker unit is responsible for converting electrical signals into sound output. It generally includes a diaphragm, a magnet and a magnetic coil. The diaphragm produces sound through the interaction of magnetic field and current.

The passive filter is responsible for frequency division and adjustment of audio signals in passive speakers. In detail, this part includes components such as inductors and capacitors, which can separate and adjust audio signals of different frequency bands. Different speaker units process audio of specific frequency bands.

The cabinet is the shell responsible for fixing and assembling the speaker unit and filter. Common cabinet materials include wood, plastic or metal. The shape and structure have an important influence on the sound quality and sound effect of passive speakers.

The connector is the interface responsible for connecting to an external power amplifier or sound source device. Audio input interfaces such as RCA and XLR belong to this part, which are used to connect to the audio output interface of an external power amplifier or sound source device.