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      PURIFI PTT4.0X04-NFC-01 4″ Ultra Low Distortion Long Stroke Driver

      € 247,89€ 299,95 4 In stock
      • -10% Order 4 for only € 269,96 per piece
      • -15% Order 6 for only € 254,96 per piece

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      Product description

      The PURIFI PTT4.0X04-NFC-01 is the smaller sibling of the PTT6.5W. Don’t let the small size fool you! Thanks to state of the art technology this is probably the most potent and well performing 4” bass-midwoofer around.



      • Compact but no less impressive
      • PURIFI ’s Natural Surround
      • Extreme low distortion over full excursion range 
      • Engineered and manufactured in Denmark
      • Excellent midrange performance
      • High power handling
      • High linear excursion limit with constant force factor


      Product Details

      PURIFI PTT4.0X04-NFC-01 bass-midwoofer 


      PURIFI is a fresh company that designs and manufactures extreme high performance transducers and amplifier modules. Don’t let their freshness fool you; Their leadership team consists out of some well-respected audio technology pioneers. PURIFI developed a deep understanding of many performance degrading aspects for both amplifiers and transducers. Thanks to this understanding the PTT4.0X04-NFC-01 is the most potent 4” bass-mid woofer from our woofer category.


      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 by a large degree.


      A whole new take on driver design

      PURIFI developed mathematical models for the motor system, suspension, dome and surround. These models allowed for optimization of each distortion mechanism separately. This systematic approach reduced all distortions mechanisms and keeps intermodulation distortion low. The result makes that the PTT4.0X04-NFC-01 is a compact 4” driver with unparalleled performance. This small driver is really up to big sound.


      The mechanism


      Low force factor modulation

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

      Constant force factor over excursion - Bl(x)

      Prevents amplitude devotions of midrange output during 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 previous cycle



      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 complex sound wave. We have been told that the Natural Surround is called ‘wormy’ by insiders. 

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      Article number
      Woofer Series
      Woofer Type
      Nominal Diameter
      Power Handling (RMS)
      200 watts
      Power Handling (max)
      Continuous Program Power
      60 watts
      Impedance (Z)
      4 ohms
      84.5 dB @ 2.83V/1m
      Frequency Response
      Voice Coil Diameter
      30 mm
      Magnet Weight
      DC Resistance (Re)
      3.8 ohms
      Voice Coil Inductance (Le)
      0.38 mH @ 1kHz
      Resonant Frequency (Fs)
      38 Hz
      Mechanical Q (Qms)
      Electromagnetic Q (Qes)
      Total Q (Qts)
      Diaphragm Mass Inc. Airload (Mms)
      Moving Mass Of Diaphragm (Mmd)
      Surface Area of Cone (Sd)
      56.7 cm²
      Volume of Displacement (Vd)
      48.2 cm³
      BL Product (BL)
      Compliance Equivalent Volume (Vas)
      6.4 liter
      Maximum Linear Excursion (Xmax)
      8.5 mm
      Driver's Mechanical Losses (Rms)
      0.66 kg/s
      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
      125 mm
      Overall Depth
      78.5 mm
      Baffle Cutout Diameter
      100 mm
      Bolt Circle Diameter
      115 mm
      # Mounting Holes
      Mounting Hole Diameter
      4.2 mm
      Sealed Volume
      Sealed F3
      Vented Volume
      Vented F3

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      5 from 5Based on 1 reviews
      Review this product
      5 of 5
      PURIFI is een jong bedrijf dat extreem goed presterende luidsprekerunits en versterkermodules ontwikkeld en vervaardigd. Jongens... let een beetje op de grammatica.... dit staat zo stom...
      By Theo Noordewier on 26 October 2021
      PTT4.0X04-NFC-01 4″ Ultra Low Distortion Long Stroke Driver
      € 247,89
      € 299,95
      PTT4.0X04-NFC-01 4″ Ultra Low Distortion Long Stroke Driver
      PTT4.0X04-NFC-01 (PTT4.0W04)
      4 In stock
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