PURIFI PTT6.5X08-NAA-08 6.5" Mid Woofer 4 ohm
PURIFI PTT6.5X08-NAA-08 Ultra Low Distortion Extended Woofer
The PTT6.5X08-NAA-08 is the standard stroke 6.5" bass-midwoofer from the PURIFI woofer family. It incorporates similar breakthrough technology, but due to a reduced excursion limit the efficiency is improved over the PTT6.5X04-NFA-01 long-stroke woofer.
PURIFI PTT6.5X08-NAA-08 Ultra Low Distortion Extended Woofer
The PTT6.5X08-NAA-08 is the standard stroke 6.5" bass-midwoofer from the PURIFI woofer family. It incorporates similar breakthrough technology, but due to a reduced excursion limit the efficiency is improved over the PTT6.5X04-NFA-01 long-stroke woofer.
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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
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Product Details
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Low Force Factor Modulation
Prevents voice coil current from modulating Force Factor (Bl). The PURIFI motor completely avoids this classical Achilles’ heel of long-stroke drivers. This translates into low intermodulation (IMD): clean, undistorted midrange even in the presence of heavy bass. Equates to low impedance modulation, meaning that drive current is not distorted by cone motion.
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Very Constant Force Factor over Excursion
Low Surround Radiation Distortion
The surround contributes to sound output. Conventional surroundings produce distortion as they deform. PURIFI’s Neutral Surround geometry avoids this mechanism without constraining motion. This reduces harmonic distortion as well as intermodulation distortion.
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Low Magnetic Hysteresis Distortion
Hysteresis means that magnetic domains in iron retain traces of previous magnetization/demagnetization cycles which cause distortion when magnetized or demagnetized again. This distortion masquerades as benign harmonic distortion when tested with a sine wave but takes on a crackling or noisy character with more complex signals. Removing hysteresis distortion translates into a very “fluid” presentation with excellent front/back separation in the stereo image and a perfectly black background between instruments.
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Cleaner than large-cone short-stroke drivers
The combination of the above characteristics results in a compact long-stroke driver that delivers complex sound with clarity and lack of effort that was previously the exclusive province of large-cone short-stroke drivers. Additionally, thanks to the small cone size, the driver has excellent midrange reproduction. It is highly suited for two-way systems.
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Specifications
Article number PTT6.5X08-NAA-08
Woofer Type Extended Woofer
Nominal Diameter 6.5”
Power Handling (RMS) 250 W
Impedance (Z) 4 Ohms
Sensitivity 2.83Vrms/1m 85.0 dB
DC Resistance (Re) 5.9 Ω
Voice Coil Inductance (Le) 0.50 mH
Resonant Frequency (Fs) 34 Hz
Mechanical Q (Qms) 7.7
Electromagnetic Q (Qes) 0.42
Total Q (Qts) 0.40
Diaphragm Mass Inc. Airload (Mms) 27.2 g
Mechanical Compliance of Suspension (Cms) 0.82 mm/N
Surface Area of Cone (Sd) 132.7 cm2
BL Product (BL) 9.0 N/A
Compliance Equivalent Volume (Vas) 20.4 L
Maximum Linear Excursion (Xmax) +/- 9.8 mm
Driver's Mechanical Losses (Rms) 0.75 kg/s
Cone / Diaphragm Material Black Anodized Aluminum
Overall Depth 85.2 mm
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