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        PTT4.0PR-NF2-01 Passive Radiator

        PTT4.0PR-NF2-01 Passive Radiator


        PURIFI PTT4.0PR-NF2-01 Passive Radiator

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        Brand: PURIFI
        € 82,60€ 99,95 8 In stock
        • -10% Purchase 4 for only € 89,96 per piece
        • -15% Purchase 6 for only € 84,96 per piece

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        • At least two years warranty
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        Product description

        The PTT4.0PR is a 4” high-performance passive radiator featuring PURIFI ’s research based technologies, including the Natural Surround and a cone made from a proprietary fibre mix.



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


        Product Details

        PURIFI PTT4.0PR Passive Radiator 


        PURIFI is a fresh company that designs and manufactures extreme 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 performance 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 mechanism separately. The result makes that the PTT6.5PR is a perfect passive radiator to accompany the PTT4.0W04 in a size efficient enclosure. Looking for a passive radiator the accompany the larger PTT6.5W04 or PTT6.5W08? Take a look at the PTT6.5PR


        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 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)
        Sensitivity (SPL at 1m / 2.83V)
        0 dB
        Frequency Response
        Voice Coil Diameter
        Magnet Weight
        DC Resistance (Re)
        Voice Coil Inductance (Le)
        Resonant Frequency (Fs)
        24 Hz
        Mechanical Q (Qms)
        Electromagnetic Q (Qes)
        Diaphragm Mass Inc. Airload (Mms)
        Moving Mass Of Diaphragm (Mmd)
        Mechanical Compliance of Suspension (Cms)
        1.41 mm/N
        Surface Area of Cone (Sd)
        57 cm²
        Volume of Displacement (Vd)
        79.8 cm³
        BL Product (BL)
        Compliance Equivalent Volume (Vas)
        6.4 liter
        Maximum Linear Excursion (Xmax)
        14 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
        125 mm
        Overall Depth
        39.5 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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        PTT4.0PR-NF2-01 Passive Radiator
        € 82,60
        € 99,95
        PTT4.0PR-NF2-01 Passive Radiator
        PTT4.0PR-NF2-01 (PTT4.0WPR)
        8 In stock
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