This 6.5" is a member of the ultra low distortion woofer family from PURIFI. Compared to the renowned PTT6.5X family, the W-version has higher sensitivity and is well suited for applications that doesn't require extended excursion. The 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 PTT6.5W04-NFA-01 features:
Vibroacoustic optimized cone and dust cap in proprietary paper fiber mix
Negligible Force Factor Modulation (FFM) and Surround Radiation Distortion (SRD)
Ultra Low Magnetic Hysteresis Distortion (MHD)
Best mix of volume displacement and midrange efficiency
Uncompromised midrange performance
Designed and manufactured in Denmark
Specifications
General Specifications
Type
Woofer
Size
6.5in
Nominal impedance
4Ω
Cone material
Proprietary Fiber Mix
Linear excursion, Xlin
±5.9mm
Maximum mechanical excursion, Xmax
±14.5mm
Motor efficiency factor, Beta
16.0 (N/A)^2/Ω
Efficiency Bandwidth Product, EBP
126.9Hz
Long term maximum power
250W
Rated noise power, 100h
80W
Electrical & Acoustical Parameter
DC resistance
3.7Ω
Minimum impedance above resonance, Zmin
4.15Ω
Frequency for minimum impedance, fmin
310Hz
Maximum impedance, Zo
88Ω
Voice Coil inductance @ 1kHz 0mm, Le
0.32mH
SPL @ 2.83Vrms/1m, 300-800Hz
90.3dB
SPL @ 1W/1m, 300-800Hz
87.5dB
Thiele/Small Paramters
Resonance frequency, fs
33Hz
Mechanical Q factor, Qms
6.3
Electrical Q factor, Qes
0.27
Total Q factor, Qts
0.26
Equivalent volume, Vas
28.9L
Effective piston area, Sd
132.7cm2
Effective piston diameter, D
13.0cm
Force factor, Bl
7.7N/A
Mechanical resistance, Rms
0.70kg/s
Moving mass, Mms
21.1g
Suspension compliance, Cms
1.10mm/N
Typical Box Tunings
Typical corner frequency, sealed B2 alignment
89.7Hz
Box volume, sealed B2 alignment
4.5L
Typical corner frequency, bass reflex PTT alignment
