PURIFI PTT4.0X08-NFC-01 4″ Ultra Low Distortion Long Stroke Driver
The PURIFI PTT4.0X08-NFC-01 is the 8 ohm version of PTT4.0X and one of the smaller siblings of the PTT6.5. Don’t let the small size fool you! Thanks to state of the art technology this is a very potent and well performing 4” bass-midwoofer around.
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Highlights
Compact but no less impressive
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 PTT4.0X08-NFC-01 bass-midwoofer PURIFI is a fresh company that designs and manufactures extreme high performance transducers and amplifier modules. Don’t let their freshness fool you; Their leadership team consists out of some well-respected audio technology pioneers. PURIFI developed a deep understanding of many performance degrading aspects for both amplifiers and transducers. Thanks to this understanding the PTT4.0X08-NFC-01 is on of the most potent 4” bass-mid woofers from our woofer category.
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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, dome 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 PTT4.0X08-NFC-01 is a compact 4” driver with unparalleled performance. This small driver is really up to big sound.
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Specifications
AArticle number PTT4.0X08-NFC-01
Nominal Diameter 4 Impedance (Z) 8 ohms
Sensitivity 82.3 dB @ 2.83V/1m
Voice Coil Diameter 30 mm
DC Resistance (Re) 7.1 ohms
Voice Coil Inductance (Le) 0.53 mH @ 1kHz
Resonant Frequency (Fs) 40 Hz
Mechanical Q (Qms) 4.3
Electromagnetic Q (Qes) 0.39
Total Q (Qts) 0.36
Diaphragm Mass Inc. Airload (Mms) 11.8g
Mechanical Compliance of Suspension (Cms) 1.33 mm/N
Surface Area of Cone (Sd) 56.7 cm2
Volume of Displacement (Vd) 48.2 cm3
BL Product (BL) 7
Compliance Equivalent Volume (Vas) 6.1 liter
Maximum Linear Excursion (Xmax) 8.5 mm
Driver's Mechanical Losses (Rms) 0.7 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 125 mm
Overall Depth 78.5 mm
Baffle Cutout Diameter 100 mm
Bolt Circle Diameter 115 mm
# Mounting Holes 6
Mounting Hole Diameter 4.2
