Passive radiator speakers are a type of audio speaker that uses passive radiators to enhance low-frequency response.

Compared to traditional speakers like bass reflex (ported) or sealed box speakers, passive radiator systems offer unique advantages in bass performance.

 

Now, let’s take the journey to know what are the passive radiator speakers:

1， What is the speaker Structure:

An audio speaker with a passive radiator always comes with an Active Driver, Passive Radiator, and Enclosure.

 

Active Driver: The main speaker driver receives amplified signals and converts them into sound. It is typically a woofer or mid-woofer.

Passive Radiator: The passive radiator looks similar to a speaker driver but without a magnet and voice coil. It does not connect to the amplifier but moves in response to air pressure changes within the enclosure.

Enclosure: This speaker cabinet houses both the active driver and the passive radiator, controlling the air movement and providing structural support.

 

2, How is the speaker working :

 

When the active driver vibrates in response to the audio signal, it creates air pressure changes inside the enclosure.

These pressure changes push and pull the passive radiator, causing it to move.

The passive radiator's movement is tuned to resonate at low frequencies, enhancing the bass output of the speaker.

Since the passive radiator operates solely based on air pressure changes and does not need electrical power, it is considered "passive."

 

3, Why do we use a passive radiator in audio speaker

 

Passive radiators can extend the low-frequency range of a speaker, allowing even small enclosures to produce deep and powerful bass.

They avoid the noise and distortion issues that can occur with bass reflex ports.

 

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