4" Ultra Low Distortion Passive Radiator

Tax included


The 4” passive radiator incorporates the easily recognizable PURIFI NeutralSurround suspension in order to eliminate Surround Radiation Distortion. With its low-distortion properties, long linear stroke and option for adding mass, the driver is eminently suited as a companion to the PTT4.0X drivers especially in compact speaker construction where a traditional reflex port would limit the performance.

The PTT4.0PR-NA2-02 features:

Vibroacoustic optimized cone and dust cap in black anodized aluminum

PURIFI Neutral Surround eliminates Surround Radiation Distortion (SRD)

14mm one-way peak excursion with constant Sd

Mass Plug with M6 thread for adding extra mass

Designed and manufactured in Denmark

Product Details

Data sheet

Nominal diameter
4" (100mm)
Resonance frequency
27 Hz
Net weight
0.15 kg
Cone Material
Anodized Aluminum
Maximum mechanical excursion Xmax
14 mm
Mechanical Q factor Qms
Equivalent volume Vas
5.5 L
Effective piston area Sd
56.7 cm2
Moving mass Mms
30.0 g