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        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm

        PURIFI PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm

        €429,95

        4 In stock10+ expected on 14-02-2025

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        PURIFI PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm

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        Brand: PURIFI
        Show all Bass-mid woofer
        6.5" | 8 Ω
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        € 355,33€ 429,95 4 In stock10+ expected on 14-02-2025
        • -10% Purchase 4 for only € 386,96 per piece
        • -15% Purchase 6 for only € 365,46 per piece
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        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm

        Product description PURIFI PTT6.5X08-NFA-01 Bass-midwoofer

        The PURIFI PTT6.5X08-NFA-01 a is a refined bass-mid-woofer, incorporating state of the art technology that is based on extended research. The result is a long-stroke woofer with unparalleled performance.

         

        Highlights

        • 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
        • High linear excursion limit with constant force factor

         

        Product Details

        PURIFI PTT6.5X08-NFA-01 bass-mid-woofer 

         

        PURIFI is a fresh company that designs and manufactures extremely high-performance woofers 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 PTT6.5X08-NFA-01 is the most refined bass-mid woofer from our woofer category.

         

        Besides this 8 ohm version, there is also a 4-ohm version and a 6,5" passive radiator available. Looking for similar performance, but something smaller? Take a look at the 4" PTT4.0W04.

         

        The challenge 

        Loudspeaker drivers are known to add a large, if not the largest, amount of distortion to 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, 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 PTT6.5X08-NFA-01 is a compact 6.5” driver that parallels or even surpasses the bass performance of a low excursion, a large surface driver, while it also excels in midrange performance.

         

        The mechanism

        Improvement

        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

         

        FAQ

        Q: Should I go with this 4 ohm or with the 8-ohm version?

        A: Both woofers have similar distortion performance and the T/S parameters are alike. The 4-ohm coils of the PTT6.5W04 allow more current to flow on a similar drive voltage. This gives higher sensitivity and is preferred in most applications. If you have an amplifier that is not comfortable with low impedance loads or has specific requirements, such as parallel woofers, this PTT6.5W08 might be more favorable.

         

        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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        Specifications

        Article number
        PTT6.5X08-NFA-01
        EAN
        0691046950048
        Woofer Type
        Bass-midwoofer
        Nominal Diameter
        6.5"
        Power Handling (RMS)
        250 watts
        Power Handling (max)
        -
        Continuous Program Power
        80 watts
        Impedance (Z)
        8 ohms
        Sensitivity (SPL at 1m / 2.83V)
        86.9 dB
        Frequency Response
        -
        Voice Coil Diameter
        39 mm
        Magnet Weight
        -
        DC Resistance (Re)
        6 ohms
        Voice Coil Inductance (Le)
        0.53 mH @ 1kHz
        Resonant Frequency (Fs)
        31 Hz
        Mechanical Q (Qms)
        6.6
        Electromagnetic Q (Qes)
        0.32
        Total Q (Qts)
        0.30
        Diaphragm Mass Inc. Airload (Mms)
        24.4 g
        Moving Mass Of Diaphragm (Mmd)
        -
        Mechanical Compliance of Suspension (Cms)
        1.06 mm/N
        Surface Area of Cone (Sd)
        132.7 cm²
        Volume of Displacement (Vd)
        132.7 cm³
        BL Product (BL)
        9.5
        Compliance Equivalent Volume (Vas)
        26.4 liter
        Maximum Linear Excursion (Xmax)
        10 mm
        Driver's Mechanical Losses (Rms)
        0.72 kg/s
        Cone / Diaphragm Material
        Proprietary Fibre Mix
        Surround Material
        Nitrile rubber
        Voice Coil Wire Material
        Aluminum
        Voice Coil Former
        Fiberglass
        Dual Voice Coil
        -
        Basket / Frame Material
        Aluminum alloy diecast
        Magnet Material
        Ferro-magnetic
        Shielded
        -
        Overall Outside Diameter
        176 mm
        Overall Depth
        90.2 mm
        Baffle Cutout Diameter
        145 mm
        Bolt Circle Diameter
        166 mm
        # Mounting Holes
        6
        Mounting Hole Diameter
        5.1 mm
        Sealed Volume
        -
        Sealed F3
        -
        Vented Volume
        -
        Vented F3
        -

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        Reviews

        1 reviews
        Review this product
        5 of 5
        -
        By Bogdan on 28 October 2024
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        € 355,33
        € 429,95
        PTT6.5X08-NFA-01 6.5″ Ultra Low Distortion Long Stroke Driver 8 Ohm
        PTT6.5X08-NFA-01 (PTT6.5W08)
        4 In stock
        10+ expected on 14-02-2025
        Add to cart
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