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Purifi
PURIFI - 4" Woofer - PTT4.0X08-NFC-01
PURIFI - 4" Woofer - PTT4.0X08-NFC-01
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$699.95 AUD
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***CURRENTLY, ALL PURIFI DRIVERS ARE MADE TO ORDER WITH EXPECTED DELIVERY WITHIN 8-12 WEEKS***
Description:
The 4” long-stroke driver incorporates the easily recognizable PURIFI NeutralSurround suspension and ultra-linear motor system PURIFI PureDrive technology working in concert to elevate performance to a whole new level despite of it’s compact size.
Features:
- Vibroacoustic optimized cone and dust cap in proprietary paper fiber mix
- Negligible Force Factor Modulation (FFM) and Surround Radiation Distortion (SRD)
- Low Magnetic Hysteresis Distortion (MHD)
- "Real" long-stroke performance with distortion remaining low over full excursion
- Uncompromised midrange performance
- Designed and manufactured in Denmark
Specifications:
| General Specifications | |
|---|---|
| Type | Extended Woofer |
| Size | 4in |
| Nominal impedance | 8Ω |
| Cone material | Proprietary Fiber Mix |
| Linear excursion, Xlin | ±8.8mm |
| Maximum mechanical excursion, Xmax | ±13.7mm |
| Motor efficiency factor, Beta | 7.4 (N/A)^2/Ω |
| Efficiency Bandwidth Product, EBP | 110.8Hz |
| Long term maximum power | 200W |
| Rated noise power, 100h | 60W |
| Electrical & Acoustical Parameter | |
|---|---|
| DC resistance | 6.4Ω |
| Minimum impedance above resonance, Zmin | 7.1Ω |
| Frequency for minimum impedance, fmin | 268Hz |
| Maximum impedance, Zo | 72Ω |
| Voice Coil inductance @ 1kHz 0mm, Le | 0.51mH |
| SPL @ 2.83Vrms/1m, 300-800Hz | 82.0dB |
| SPL @ 1W/1m, 300-800Hz | 81.5dB |
| Thiele/Small Parameters | |
|---|---|
| Resonance frequency, fs | 41Hz |
| Mechanical Q factor, Qms | 4.2 |
| Electrical Q factor, Qes | 0.41 |
| Total Q factor, Qts | 0.37 |
| Equivalent volume, Vas | 5.7L |
| Effective piston area, Sd | 56.7cm2 |
| Effective piston diameter, D | 8.5cm |
| Force factor, Bl | 6.9N/A |
| Mechanical resistance, Rms | 0.73kg/s |
| Moving mass, Mms | 11.7g |
| Suspension compliance, Cms | 1.25mm/N |
| Typical Box Tunings | |
|---|---|
| Typical corner frequency, sealed B2 alignment | 78.3Hz |
| Box volume, sealed B2 alignment | 2.1L |
| Typical corner frequency, bass reflex PTT alignment | 38.4Hz |
| Box resonance, bass reflex PTT alignment | 42.2Hz |
| Box volume, bass reflex PTT alignment | 6.0L |
| Port diameter, bass reflex PTT alignment | 4.1cm |
| Port length, bass reflex PTT alignment | 37.1cm |
| Typical corner frequency, 2xPR PTT alignment | 45.0Hz |
| Box volume, 2xPR PTT alignment | 4.7L |
| PR mass per PR, 2xPR PTT alignment | 30.4g |
| Voice Coil Properties | |
|---|---|
| Voice Coil diameter | 30mm |
| Voice Coil length | 21.6mm |
| Voice Coil layers | 4 |
| Airgap height | 4.0mm |
| Winding material | Alu |
| Physical Dimensions | |
|---|---|
| Basket diameter | 125mm |
| Cutout diameter | 101mm |
| Mounting hole pattern diameter | 115mm |
| Mounting hole diameter | 4.2mm |
| Magnet diameter | 90mm |
| Outer flange height | 3.6mm |
| Build-in depth | 73.5mm |
| Weight | 1.25kg |
| Internal volume displacement | 0.23L |
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