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The PTT6.5PR-NF1-01 is a 6.5” high-performance passive radiator featuring PURIFI ' s research-based technologies, including the Natural Surround and a cone made from a proprietary fiber mix.
PURIFI PTT6.5PR-NF1-01 passive radiator
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. Thanks to this understanding the passive radiators from PURIFI are the most high-end passive radiators available at SoundImports.
Loudspeaker drivers are known to add a large, if not the largest, amount of distortion on 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.
PURIFI developed mathematical models for the suspension, cone, and surround. These models allowed for the optimization of different distortion mechanisms separately. The result makes that the PTT6.5PR-NF1-01 is a perfect passive radiator to accompany the PTT6.5W04 and PTT6.5W08 long-stroke bass-midwoofers.
Low surround radiation distortion
Reduces harmonic and intermodulation distortion caused by surround
Q: Why is this surround odd shaped?
A: This is the PURIFI Natural Surround. Conventional surrounds 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.
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