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      PURIFI PTT8.0X04-NAB-02 Mid-range Woofer

      € 578,47€ 699,95 8 In stock
      • -5% Order 4 for only € 664,95 per piece

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      Product description

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



      • Negligible Force Factor Modulation and Surround Radiation Distortion
      • Low Magnetic Hysteresis Distortion
      • “Real” long-stroke performance: distortion remains low over full excursion
      • Uncompromised midrange performance
      • Designed and Manufactured in Denmark


      Product Details

      PURIFI PTT8.0X04-NAB-02 Mid-range Woofer


      The PTT8.0X04-NAB-02 has been optimized for Midrange use and achieves high sensitivity. 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. 


      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 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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      Article number
      Woofer Series
      PTT NAB
      Nominal Diameter
      Power Handling (RMS)
      350 W
      DC Resistance (Re)
      3.5 Ω
      Resonant Frequency (Fs)
      26 Hz
      Mechanical Q (Qms)
      Electromagnetic Q (Qes)
      Total Q (Qts)
      Diaphragm Mass Inc. Airload (Mms)
      Mechanical Compliance of Suspension (Cms)
      BL Product (BL)
      8.3 N/A
      Compliance Equivalent Volume (Vas)
      66 L
      Maximum Linear Excursion (Xmax)
      +/- 9.3 mm
      Cone / Diaphragm Material
      Black Anodized Aluminum
      Mounting Hole Diameter
      5.2 mm

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      PTT8.0X04-NAB-02 Mid-range Woofer
      € 578,47
      € 699,95
      PTT8.0X04-NAB-02 Mid-range Woofer
      8 In stock
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