PURIFI PTT6.5W08-NFA-01 6.5″ Ultra Low Distortion Driver 8 Ohm

The PTT6.5W08-NFA-01 is the standard stroke 6.5" bass-midwoofer from the PURIFI woofer family. It incorporates similar breakthrough technology, but due to a reduced excursion limit the efficiency is improved over the PTT6.5X04-NFA-01 long stroke woofer.

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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
• Perfect balance between volume displacement and midrange efficiency

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Product Details

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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.

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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 optimization of each distortion mechanism separately. This systematic approach reduced all distortions mechanisms and keeps intermodulation distortion low. The result makes that the PTT6.5W08-NFA-01 is a compact 6.5” driver that parallels or even surpasses the bass performance of a low excursion, large surface driver, while it also excels in midrange performance.

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Specifications

Article number PTT6.5W08-NFA-01

Nominal Diameter 6.5"

Power Handling (RMS) 250 watts

Continuous Program Power 80 watts

Impedance (Z) 8 ohms

Sensitivity 87.9 dB @ 2.83V/1m

Voice Coil Diameter 39 mm

DC Resistance (Re) 6.9 ohm

Voice Coil Inductance (Le) 0.48 mH @ 1kHz

Resonant Frequency (Fs) 38.5 Hz

Mechanical Q (Qms) 6.7

Electromagnetic Q (Qes) 0.35

Total Q (Qts) 0.33

Diaphragm Mass Inc. Airload (Mms) 19.4g

Mechanical Compliance of Suspension (Cms) 0.88 mm/N

Surface Area of Cone (Sd) 132.7 cm2

Volume of Displacement (Vd) 78.3 cm3

BL Product (BL) 9.6

Compliance Equivalent Volume (Vas) 22 liter

Maximum Linear Excursion (Xmax) 5.9 mm

Driver's Mechanical Losses (Rms) 0.9 kg/s

Cone / Diaphragm Material Proprietary Fibre Mix

Surround Material Nitrile rubber

Voice Coil Wire Material Aluminum

Voice Coil Former Fiberglass

Basket / Frame Material Aluminum alloy diecast

Magnet Material Ferro-magnetic

Overall Outside Diameter 176 mm

Overall Depth 90.2 mm

Baffle Cutout Diameter 145 mm

Bolt Circle Diameter 5.1 mm

# Mounting Holes 6

Mounting Hole Diameter 5.1