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- Stock: In Stock
- Brand: Purifi
- Model: PTT4.0W04
- Weight: 3.00 Kg
The PURIFI PTT4.0W04 is the smaller sibling of the PTT6.5W. Don’t let the small size fool you! Thanks to state of the art technology this is probably the most potent and well performing 4” bass-midwoofer around.
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
Product Details
PURIFI PTT4.0W04 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 PTT4.0W04 is the most potent 4” bass-mid woofer from our woofer category.
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.
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 PTT4.0W04 is a compact 4” driver with unparalleled performance. This small driver is really up to big sound.
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
FAQ
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 complex sound wave. We have been told that the Natural Surround is called ‘wormy’ by insiders.