PURIFI PTT8.0X08-NAB-01. Mid-range Woofer 8" 8 Ohmios
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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
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 PTT8.0X08-NAB-01 Mid-range Woofer
The PTT8.0X08-NAB-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.
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 mechanism
Improvement
Low force factor modulation
Current through the voice coil is not distorted by cone movement. Gives undistorted midrange regardless of the excursion
Constant force factor over excursion - Bl(x)
Prevents amplitude devotions of midrange output during the large excursion (sometimes called ‘burbling’)
Low surround radiation distortion
Reduces harmonic and intermodulation distortion caused by surround
Low magnetic hysteria distortion
Reduces harmonic and intermodulation distortion caused by magnetic traces left by the previous cycle
FAQ
Q: Why is this surround odd-shaped?
A: This is the PURIFI Natural Surround. Conventional surroundings create distortion as they deform. The shape of the Natural Surround reduces cone edge resonances and distortion. It might be odd-looking, but form follows function here. A more detailed look shows that the surround actually represents a complex sound wave. We are told that the Natural Surround is also called ‘wormy’ by insiders.
Nominal Diameter: 8.0"
Power Handling (RMS): TBD
Impedance (Z): 8 ohms
Sensitivity (SPL at 1m / 2.83V): 86.4 dB
Voice Coil Diameter: 52 mm
DC Resistance (Re): 6 ohm
Voice Coil Inductance (Le): 0.33 mH
Resonant Frequency (Fs): 24 Hz
Mechanical Q (Qms): 5.8
Electromagnetic Q (Qes): 0.37
Total Q (Qts): 0.35
Diaphragm Mass Inc. Airload (Mms): 47.6g
Mechanical Compliance of Suspension (Cms): 0.95 mm/N
Surface Area of Cone (Sd): 235.1 cm2
Volume of Displacement (Vd): 218.6 cm³
BL Product (BL): 10.7
Compliance Equivalent Volume (Vas): 74.5 L
Maximum Linear Excursion (Xmax): 9.3 mm
Driver's Mechanical Losses (Rms): 1.22 kg/s
Cone / Diaphragm Material: Black Anodized Aluminum
Surround Material: Nitrile rubber
Basket / Frame Material: Aluminum alloy diecast
Magnet Material: Ferro-magnetic
Overall Outside Diameter: 221.3 mm
Overall Depth: 108.5 mm
Baffle Cutout Diameter: 193 mm
Bolt Circle Diameter: 5.2 mm
# Mounting Holes: 6
