PURIFI PTT6.5M08-NFA-01. Ultra Low Distortion Midrange
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Dedicated midrange driver with enhanced efficiency. Negligible force factor modulation. Ultra-low magnetic hysteresis distortion. Utilizes PURIFI’s neutral surround technology.
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
Product Details:
PURIFI PTT6.5M08-NFA-01 Ultra Low Distortion Midrange
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 a 4-ohm version, the PTT6.5M04-NFA-01, and a 6,5" passive radiator available.
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. The result makes that the dedicated midrange driver with enhanced efficiency. Negligible force factor modulation. Ultra-low magnetic hysteresis distortion. Utilizes PURIFI’s neutral surround technology.
Specifications:
Woofer Type: Ultra Low Distortion Midrange
Nominal Diameter: 6.5"
Power Handling (RMS): 200 Watts
Impedance (Z): 8 Ohms
Sensitivity (SPL at 1m / 2.83V): 91 dB
DC Resistance (Re): 6.5 Ω
Resonant Frequency (Fs): 57 Hz
Electromagnetic Q (Qes): 0.42
Total Q (Qts): 0.38
Diaphragm Mass Inc. Airload (Mms): 17.0 g
Mechanical Compliance of Suspension (Cms): 0.46 mm/N
Surface Area of Cone (Sd): 133 cm2
BL Product (BL): 9.7 N/A
Compliance Equivalent Volume (Vas): 12 L
Maximum Linear Excursion (Xmax): 3.9 mm
Driver's Mechanical Losses (Rms): 1.44 kg/s
Cone / Diaphragm Material: Proprietary Fibre Mix
