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

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.

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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

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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.

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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.

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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.

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Specifications

Article number PTT6.5X08-NFA-01

Woofer Series -

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 86.9 dB @ 2.83V/1m

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 -