4" Ultra Low Distortion Passive Radiator

DKK 610.00 610.0 DKK DKK 610.00 VAT Excluded

DKK 610.00 VAT Excluded

Not Available For Sale

  • Type
  • Size
  • Cone material
  • Maximum mechanical excursion, Xmax
  • Mass Plug thread size
  • Resonance frequency, fs
  • Mechanical Q factor, Qms
  • Equivalent volume, Vas
  • Effective piston area, Sd
  • Effective piston diameter, D
  • Mechanical resistance, Rms
  • Moving mass, Mms
  • Suspension compliance, Cms
  • Basket diameter
  • Cutout diameter
  • Mounting hole pattern diameter
  • Mounting hole diameter
  • Outer flange height
  • Build-in depth
  • Weight

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Payment fees (e.g. Stripe fees) are not refundable 
All transducers are made-to-order
Expect 8-12 weeks of delivery time   
Terms and Conditions


Data Sheet     3D Drawing 


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


General Specifications
Type Passive Radiator
Size 4in
Cone material Black Anodized Aluminum
Maximum mechanical excursion, Xmax ±14.0mm
Mass Plug thread size M6
Thiele/Small Paramters
Resonance frequency, fs 27Hz
Mechanical Q factor, Qms 6
Equivalent volume, Vas 5.5L
Effective piston area, Sd 56.7cm2
Effective piston diameter, D 8.5cm
Mechanical resistance, Rms 0.85kg/s
Moving mass, Mms 30.0g
Suspension compliance, Cms 1.20mm/N
Physical Dimensions
Basket diameter 125mm
Cutout diameter 101mm
Mounting hole pattern diameter 115mm
Mounting hole diameter 4.2mm
Outer flange height 3.6mm
Build-in depth 39.5mm
Weight 0.15kg