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      PURIFI PTT6.5M08-NFA-01 Mid-range Woofer

      € 355,33€ 429,95 8 Op voorraad10+ verwacht op 10-02-2023
      • -10% Bestelling 4 voor slechts € 386,96 per stuk
      • -15% Bestelling 6 voor slechts € 365,46 per stuk

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      Dedicated midrange driver with enhanced efficiency. Negligible force factor modulation. Ultra-low magnetic hysteresis distortion. Utilizes PURIFI’s neutral surround technology.



      • A whole new take on driver design
      • PURIFI’s Natural Surround
      • Extreme low distortion over full excursion range 
      • Engineered and manufactured in Denmark
      • Excellent midrange performance
      • High power handling
      • Perfect balance between volume displacement and midrange efficiency


      Product Details

      PURIFI PTT6.5M08-NFA-01 Ultra Low Distortion Midrange


      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. Besides this 8 ohm version, there is also a 4-ohm version, the PTT6.5M04-NFA-01, and a 6,5" passive radiator available.


      The challenge 

      Loudspeaker drivers are known to add a large, if not the largest, amount of distortion in 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 to a large degree.


      A whole new take on driver design

      PURIFI developed mathematical models for the motor system, suspension, cone, and surround. These models allowed for the optimization of each distortion mechanism separately. This systematic approach reduced all distortions mechanisms and keeps intermodulation distortion low. The result makes that the dedicated midrange driver with enhanced efficiency. Negligible force factor modulation. Ultra-low magnetic hysteresis distortion. Utilizes PURIFI’s neutral surround technology.


      The mechanism


      Low force factor modulation

      Current through the voice coil is not distorted by cone movement. Gives undistorted midrange regardless of the excursion

      Constant force factor over excursion - Bl(x)

      Prevents amplitude devotions of midrange output during the large excursion (sometimes called ‘burbling’)

      Low surround radiation distortion

      Reduces harmonic and intermodulation distortion caused by surround

      Low magnetic hysteria distortion

      Reduces harmonic and intermodulation distortion caused by magnetic traces left by the previous cycle



      Q: Why is this surround odd-shaped?

      A: This is the PURIFI Natural Surround. Conventional surroundings 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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      Woofer type
      Ultra Low Distortion Midrange
      Nominale diameter
      Belastbaarheid (RMS)
      200 Watts
      Impedantie (Z)
      8 Ohms
      2.83Vrms/1m 91.0 dB
      Gelijkstroomweerstand (Re)
      6.5 Ω
      Resonantiefrequentie (Fs)
      57 Hz
      Elektrische Q (Qes)
      Totale Q (Qts)
      Bewegende massa (Mms)
      17.0 g
      Compliantie van de ophanging (Cms)
      0.46 mm/N
      Effectief oppervlak (Sd)
      133 cm2
      Krachtsfactor (BL)
      9.7 N/A
      Equivalentvolume (Vas)
      12 L
      Maximale excursie (Xmax)
      +/- 3.9 mm
      Driver's Mechanical Losses (Rms)
      1.44 kg/s
      Cone / Diaphragm Material
      Proprietary Fibre Mix

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      PTT6.5M08-NFA-01 Mid-range Woofer
      € 355,33
      € 429,95
      PTT6.5M08-NFA-01 Mid-range Woofer
      8 Op voorraad
      10+ verwacht op 10-02-2023
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