6.5" Passive radiator with alu cone, 85g moving mass

DKK 750.00 750.0 DKK DKK 750.00 VAT Excluded

DKK 750.00 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 6.5” 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 PTT6.5X drivers especially in compact speaker construction where a traditional reflex port would limit the performance.

The PTT6.5PR-NA2-03 features:

  • Vibroacoustic optimized cone and dust cap in black anodized aluminum
  • PURIFI Neutral Surround eliminates Surround Radiation Distortion (SRD)
  • 15mm 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 6.5in
Cone material Black Anodized Aluminum
Maximum mechanical excursion, Xmax ±15.0mm
Mass Plug thread size M6
Thiele/Small Paramters
Resonance frequency, fs 19Hz
Mechanical Q factor, Qms 13.1
Equivalent volume, Vas 20.5L
Effective piston area, Sd 132.7cm2
Effective piston diameter, D 13.0cm
Mechanical resistance, Rms 0.78kg/s
Moving mass, Mms 85.0g
Suspension compliance, Cms 0.82mm/N
Physical Dimensions
Basket diameter 176mm
Cutout diameter 148mm
Mounting hole pattern diameter 166mm
Mounting hole diameter 5.2mm
Outer flange height 3.6mm
Build-in depth 49.0mm
Weight 0.25kg