4" Ultra Low Distortion Passive Radiator

DKK 530.00 530.0 DKK DKK 530.00 VAT Excluded

DKK 530.00 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:


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-NF2-01 features:

  • Vibroacoustic optimized cone and dust cap in proprietary paper fiber mix
  • 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 Proprietary Fiber Mix
Maximum mechanical excursion, Xmax ±14.0mm
Mass Plug thread size M6
Thiele/Small Paramters
Resonance frequency, fs 24Hz
Mechanical Q factor, Qms 7
Equivalent volume, Vas 6.4L
Effective piston area, Sd 56.7cm2
Effective piston diameter, D 8.5cm
Mechanical resistance, Rms 0.65kg/s
Moving mass, Mms 30.0g
Suspension compliance, Cms 1.41mm/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