Purifi PTT4.0X04-NAC-03

Purifi PTT4.0X04-NAC-03

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.

The PTT4.0X04-NAC-03 features:

• Vibroacoustic optimized cone and dust cap in black anodized aluminum
• 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 

General Specifications

• Nominal impedance 4Ω
• Cone material Black Anodized Aluminum
• Linear excursion, Xlin ±8.8mm
• Maximum mechanical excursion, Xmax ±13.7mm
• Motor efficiency factor, Beta 9.8 (N/A)^2/Ω
• Efficiency Bandwidth Product, EBP 129.0Hz
• Long term maximum power 200W
• Rated noise power, 100h 60W
• Electrical & Acoustical Parameter
• DC resistance 3.8Ω
• Minimum impedance above resonance, Zmin 4.4Ω
• Frequency for minimum impedance, fmin 256Hz
• Maximum impedance, Zo 46Ω
• Voice Coil inductance @ 1kHz 0mm, Le 0.38mH
• SPL @ 2.83Vrms/1m, 300-800Hz 83.9dB
• SPL @ 1W/1m, 300-800Hz 81.3dB

Thiele/Small Paramters

• Resonance frequency, fs 40Hz
• Mechanical Q factor, Qms 3.8
• Electrical Q factor, Qes 0.34
• Total Q factor, Qts 0.31
• Equivalent volume, Vas 5.5L
• Effective piston area, Sd 56.7cm2
• Effective piston diameter, D 8.5cm
• Force factor, Bl 6.1N/A
• Mechanical resistance, Rms 0.87kg/s
• Moving mass, Mms 13.0g
• Suspension compliance, Cms 1.22mm/N
• Typical Box Tunings
• Typical corner frequency, sealed B2 alignment 91.2Hz
• Box volume, sealed B2 alignment 1.3L
• Typical corner frequency, bass reflex PTT alignment 47.3Hz
• Box resonance, bass reflex PTT alignment 50.4Hz
• Box volume, bass reflex PTT alignment 3.7L
• Port diameter, bass reflex PTT alignment 4.5cm
• Port length, bass reflex PTT alignment 50.3cm
• Typical corner frequency, 2xPR PTT alignment 52.0Hz
• Box volume, 2xPR PTT alignment 3.1L
• PR mass per PR, 2xPR PTT alignment 32.7g
• Voice Coil Properties
• Voice Coil diameter 30mm
• Voice Coil length 21.6mm
• Voice Coil layers 4
• Airgap height 4mm
• Winding material Alu

Physical Dimensions

• Basket diameter 125mm
• Cutout diameter 101mm
• Mounting hole pattern diameter 115mm
• Mounting hole diameter 4.2mm
• Magnet diamter 90mm
• Outer flange height 3.6mm
• Build-in depth 73.5mm
• Weight 1.25kg
• Internal volume displacement 0.23L