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      PURIFI PTT6.5PR-NF1-01 Passive Radiator

      € 107,40€ 129,95 10+ In stock
      • -10% Order 4 for only € 116,96 per piece
      • -15% Order 6 for only € 110,46 per piece

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      Product description

      The PTT6.5PR-NF1-01 is a 6.5” high-performance passive radiator featuring PURIFI ' s research-based technologies, including the Natural Surround and a cone made from a proprietary fiber mix.



      • A whole new take on passive radiator design
      • PURIFI ’s Natural Surround
      • Bimax spider
      • Engineered and manufactured in Denmark
      • High linear excursion limit
      • Tunable mass


      Product Details

      PURIFI PTT6.5PR-NF1-01 passive radiator 


      PURIFI is a fresh company that designs and manufactures extremely high-performance transducers and amplifier modules. Don’t let the freshness fool you; Their leadership team consists out of some well-respected audio technology pioneers. PURIFI developed a deep understanding of many performances degrading aspects for both amplifiers and transducers. Thanks to this understanding the passive radiators from PURIFI are the most high-end passive radiators available at SoundImports.


      The challenge 

      Loudspeaker drivers are known to add a large, if not the largest, amount of distortion on an audio signal chain. Reducing this distortion is a challenge with the complication of fine-tuning to improve one part (e.g. harmonic distortion) often results in a degradation of another part (e.g. intermodulation distortion). These distortions consist out of several separate distortion mechanisms. By carefully mapping and completely understanding these mechanisms, PURIFI succeeded in improving the overall performance by a large degree.


      A whole new take on passive radiator design

      PURIFI developed mathematical models for the suspension, cone, and surround. These models allowed for the optimization of different distortion mechanisms separately. The result makes that the PTT6.5PR-NF1-01 is a perfect passive radiator to accompany the PTT6.5W04 and PTT6.5W08 long-stroke bass-midwoofers.


      The mechanism


      Low surround radiation distortion

      Reduces harmonic and intermodulation distortion caused by surround



      Q: Why is this surround odd shaped?

      A: This is the PURIFI Natural Surround. Conventional surrounds create distortion as they deform. The shape of the Natural Surround reduces cone edge resonances and distortion. It might be odd looking, but form follows function here. A more detailed look shows that the surround actually represents a complex sound wave. We are told that the Natural Surround is also called ‘wormy’ by insiders.

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      Article number
      Woofer Series
      Woofer Type
      Passive radiator
      Nominal Diameter
      Power Handling (RMS)
      Power Handling (max)
      Continuous Program Power
      Impedance (Z)
      Frequency Response
      Voice Coil Diameter
      Magnet Weight
      DC Resistance (Re)
      Voice Coil Inductance (Le)
      Resonant Frequency (Fs)
      17 Hz
      Mechanical Q (Qms)
      Electromagnetic Q (Qes)
      Total Q (Qts)
      Diaphragm Mass Inc. Airload (Mms)
      Moving Mass Of Diaphragm (Mmd)
      Mechanical Compliance of Suspension (Cms)
      1.05 mm/N
      Surface Area of Cone (Sd)
      133 cm²
      Volume of Displacement (Vd)
      199.5 cm³
      BL Product (BL)
      Compliance Equivalent Volume (Vas)
      26.2 liter
      Maximum Linear Excursion (Xmax)
      15 mm
      Driver's Mechanical Losses (Rms)
      Cone / Diaphragm Material
      Proprietary Fibre Mix
      Surround Material
      Nitrile rubber
      Voice Coil Wire Material
      Voice Coil Former
      Dual Voice Coil
      Basket / Frame Material
      Aluminum alloy diecast
      Magnet Material
      Overall Outside Diameter
      176 mm
      Overall Depth
      48.7 mm
      Baffle Cutout Diameter
      144 mm
      Bolt Circle Diameter
      166 mm
      # Mounting Holes
      Mounting Hole Diameter
      5.1 mm
      Sealed Volume
      Sealed F3
      Vented Volume
      Vented F3

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      PTT6.5PR-NF1-01 Passive Radiator
      € 107,40
      € 129,95
      PTT6.5PR-NF1-01 Passive Radiator
      PTT6.5PR-NF1-01 (PTT6.5PR)
      10+ In stock
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