Passive Radiator

R2026b

Model of passive radiator or drone cone

Since R2026b

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  • Passive Radiator block

Libraries:
Simscape Acoustics / Applications / Moving Coil Speakers

Description

Add-On Required: This feature requires the Simscape Acoustics add-on.

This block models the mechanical and acoustic elements of a passive radiator. The block has acoustic conserving ports for the front and back of the radiator and an optional mechanical translational conserving port for the mass of the nonmoving speaker components.

A passive radiator is an unpowered loudspeaker driven by the pressure inside an acoustic enclosure. Radiators are typically included in an acoustic enclosure with at least one powered loudspeaker to boost low frequencies. The Passive Radiator block models the physical properties of a passive radiator by implementing an equivalent circuit using Simscape™ blocks from the mechanical translational and acoustic domains. The figure shows the equivalent circuit using the following Simscape blocks:

  • The block models the total mass of the moving speaker using a Mass (Simscape) block.

  • The block models speaker stiffness using a Translational Spring (Simscape) block.

  • The block models mechanical friction in the speaker using a Translational Damper (Simscape) block.

  • The block models how cone movement causes compression and rarefaction in air molecules using a Mechanical to Acoustic Converter block.

Equivalent circuit to the Passive Radiator block as a Simscape model. The circuit includes the optional conserving mechanical translational port.

Examples

New
Loudspeaker Enclosure Modeling with Simscape Acoustics

Loudspeaker Enclosure Modeling with Simscape Acoustics

Simulate different types of loudspeakers using Simscape Acoustics.

New
Dual Passive Radiator Subwoofer Modeling with Simscape Acoustics

Dual Passive Radiator Subwoofer Modeling with Simscape Acoustics

Simulate a dual passive radiator subwoofer in Simscape Acoustics.

Ports

Conserving

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Acoustic conserving port associated with the front of the passive radiator. This port is typically connected to a radiation impedance, such as the Circular Piston Radiation Impedance block.

Acoustic conserving port associated with the rear of the passive radiator. This port is typically connected to an acoustic enclosure, such as the Ported Speaker Enclosure block.

Mechanical translational conserving port associated with the passive radiator. You can connect this port to elements that model the mass of the nonmoving parts of the enclosure.

Dependencies

To enable this port, select the Include mechanical port parameter.

Parameters

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Mass of the moving passive radiator cone.

Stiffness of the passive radiator suspension.

Mechanical resistance modeling viscous friction in the passive radiator.

Area of the passive radiator cone.

Option to include a mechanical translational port for connecting to external mechanical elements. To enable the M port, select this parameter.

Version History

Introduced in R2026b

See Also

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