PTT4.0X08-NFC-01 4″ Ultra Low Distortion Long Stroke Driver

The PURIFI PTT4.0X08-NFC-01 is the 8 ohm version of PTT4.0X and one of the smaller siblings of the PTT6.5. Don’t let the small size fool you! Thanks to state of the art technology this is a very potent and well performing 4” bass-midwoofer around.
299,95 €
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The PURIFI PTT4.0X08-NFC-01 is the 8 ohm version of PTT4.0X and one of the smaller siblings of the PTT6.5. Don’t let the small size fool you! Thanks to state of the art technology this is a very 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 PTT4.0X08-NFC-01 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 PTT4.0X08-NFC-01 is on of the most potent 4” bass-mid woofers from our woofer category.

 

Besides this 8 ohm version, there is also a 4-ohm version and a 4" passive radiator available.

 

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 PTT4.0X08-NFC-01 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. 

 

Q: Should I go with this 4 ohm or with the 8-ohm version?

A: Both woofers have similar distortion performance and the T/S parameters are alike. The 4-ohm coils of the PTT4.0X04-NFC-01 allow more current to flow on a similar drive voltage. This gives higher sensitivity and is preferred in most applications. If you have an amplifier that is not comfortable with low impedance loads or has specific requirements, such as parallel woofers, this PTT4.0X08-NFC-01 might be more favorable.

SIPTT40X08NFC01

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Impedance
8 Ohm
Sensitivity
82.3 dB @ 2.83V/1m
Resonance frequency (fs)
40 Hz
DC resistance (Re)
7.1 ohms
Mechanical Q (Qms)
4.3
Electrical Q at Fs (Qes)
0.39
Total Q factor (Qts)
0.36
Speaker diameter
4"
Voice coil inductance (L)
0.53 mH @ 1kHz
Effective mechanical mass incl air load (mms)
11.8g
Effective piston radiating area (Sd)
56.7 cm2
Force factor (BL)
7
Equivalent volume of compliance (Vas)
6.1 liter
Overall diameter
125 mm
Mounting diameter
100 mm