PURIFI PTT6.5M04-NFA-01 Ultra Low Distortion Midrange

Dedicated midrange driver with enhanced efficiency. Negligible force factor modulation. Ultra-low magnetic hysteresis distortion. Utilizes PURIFI’s neutral surround technology.

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Highlights

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Product Details

PURIFI PTT6.5M04-NFA-01 Ultra Low Distortion Midrange The PTT6.5M04-NFA-01 has been optimized for Midrange use and achieves higher sensitivity as compared to the X- and W- versions of PTT6.5 product family. Furthermore, the M-version has a slight redesign chassis.

PURIFI is a fresh company that designs and manufactures extremely 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 performances degrading aspects for both amplifiers and transducers.

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 to 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 PTT6.5M04-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 PTT6.5M04-NFA-01

Nominal Diameter 6.5"

Power Handling (RMS) 250 W

Impedance (Z) 4 Ohms

Sensitivity 2.83Vrms/1m 93.2 dB

DC Resistance (Re) 3.9 Ω

Voice Coil Inductance (Le) 0.26 mH

Resonant Frequency (Fs) 55 Hz

Mechanical Q (Qms) 4.2

Electromagnetic Q (Qes) 0.36

Total Q (Qts) 0.33

Diaphragm Mass Inc. Airload (Mms) 17.8 g

Mechanical Compliance of Suspension (Cms) 0.47 mm/N

Surface Area of Cone (Sd) 132.7 cm2

BL Product (BL) 8.1 N/A

Compliance Equivalent Volume (Vas) 11.7 L

Maximum Linear Excursion (Xmax) +/- 3.9 mm

Driver's Mechanical Losses (Rms) 1.47 kg/s

Cone / Diaphragm Material Proprietary Fibre Mix