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PURIFI PTT6.5X04-NFA-01
PURIFI PTT6.5X04-NFA-01. Ultra Low Distortion Long Stroke Driver 4 Ohm
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The PURIFI PTT6.5X04-NFA-01 is a refined bass-midwoofer, incorporating state of the art technology that is based on extended research. The result is this ultra linear long-stroke woofer with unparalleled performance.
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
High linear excursion limit with constant force factor
Product Details:
PURIFI PTT6.5X04-NFA-01 bass-midwoofer
PURIFI is a fresh company that designs and manufactures extreme 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 performance degrading aspects for both amplifiers and transducers. Thanks to this understanding the PTT6.5X04-NFA-01 is the most refined bass-mid woofer from our woofer category.
Besides this 4 ohm version, there is also an 8 ohm version and a 6,5" passive radiator available. Looking for similar performance, but something smaller? Take a look at the 4" PTT4.0W04.
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 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 PTT6.5X04-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.
The mechanism
Improvement
Low force factor modulation
Current through the voice coil is not distorted by cone movement. Gives undistorted midrange regardless of excursion
Constant force factor over excursion - Bl(x)
Prevents amplitude devotions of midrange output during 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 previous cycle
Specifications:
Woofer Series: -
Woofer Type: Bass-midwoofer
Nominal Diameter: 6.5"
Power Handling (RMS): 250 watts
Power Handling (max): -
Continuous Program Power: 80 watts
Impedance (Z): 4 ohms
Sensitivity (SPL at 1m / 2.83V): 88.7 dB
Frequency Response: -
Voice Coil Diameter: 39 mm
Magnet Weight: -
DC Resistance (Re): 3.7 ohms
Voice Coil Inductance (Le): 0.38 mH @ 1kHz
Resonant Frequency (Fs): 30 Hz
Mechanical Q (Qms): 5.8
Electromagnetic Q (Qes): -
Total Q (Qts): 0.27
Diaphragm Mass Inc. Airload (Mms): 26.7 g
Moving Mass Of Diaphragm (Mmd): -
Mechanical Compliance of Suspension (Cms): 1.04 mm/N
Surface Area of Cone (Sd): 132.7 cm²
Volume of Displacement (Vd): 132.7 cm³
BL Product (BL): 8.1
Compliance Equivalent Volume (Vas): 25.9 liter
Maximum Linear Excursion (Xmax): 10 mm
Driver's Mechanical Losses (Rms): 0.88 kg/s
Cone / Diaphragm Material: Proprietary Fibre Mix
Surround Material: Nitrile rubber
Voice Coil Wire Material: Aluminum
Voice Coil Former: Fiberglass
Dual Voice Coil: -
Basket / Frame Material: Aluminum alloy diecast
Magnet Material: Ferro-magnetic
Shielded: -
Overall Outside Diameter: 176 mm
Overall Depth: 90.2 mm
Baffle Cutout Diameter: 145 mm
Bolt Circle Diameter: 166 mm
# Mounting Holes: 6
Mounting Hole Diameter: 5.1 mm
Sealed Volume: -
Sealed F3: -
Vented Volume: -
Vented F3: -
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