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PURIFI PTT5.25X08-NFA-01 Mid-range Woofer

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

€387.95 Save 3%
Tax included

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  • Negligible Force Factor Modulation and Surround Radiation Distortion
  • Low Magnetic Hysteresis Distortion
  • “Real” long-stroke performance: distortion remains low over full excursion
  • Uncompromised midrange performance
  • Designed and Manufactured in Denmark


Product Details

PURIFI PTT5.25X08-NFA-01 Mid-range Woofer


The PTT5.25X08-NFA-01 has been optimized for Midrange use and achieves high sensitivity. 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. Besides this 8 ohm version, there is also an 4 ohm version.


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.


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.


Data sheet

Driver type
85.7 dB 2.83V/1m
Frequency range
Resonance frequency (fs)
29 Hz
DC resistance (Re)
Mechanical Q (Qms)
Electrical Q at Fs (Qes)
Speaker diameter
Power handling
250 W
Voice coil inductance (L)
Effective mechanical mass incl air load (mms)
Effective piston radiating area (Sd)
85 cm²
Force factor (BL)
Equivalent volume of compliance (Vas)
13 liter