This 6.5" is a member of the ultra low distortion extended-stroke woofer family from PURIFI. 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 PTT6.5X08-NFA-06 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)
"Real" long-stroke performance with distortion remaining low over full excursion
Uncompromised midrange performance
Designed and manufactured in Denmark
The PTT6.5X08-NFA-06 serves as a substitute for the discontinued PTT6.5X08-NFA-01. It is important to note that the cut-out diameter has been enlarged.
Specifications
General Specifications
Type
Extended Woofer
Size
6.5in
Nominal impedance
8Ω
Cone material
Proprietary Fiber Mix
Linear excursion, Xlin
±9.8mm
Maximum mechanical excursion, Xmax
±14.5mm
Motor efficiency factor, Beta
13.4 (N*A)^2/Ω
Efficiency Bandwidth Product, EBP
91.2Hz
Long term maximum power
250W
Rated noise power, 100h
80W
Electrical & Acoustical Parameter
DC resistance
5.9Ω
Minimum impedance above resonance, Zmin
6.6Ω
Frequency for minimum impedance, fmin
250Hz
Maximum impedance, Zo
96Ω
Voice Coil inductance @ 1kHz 0mm, Le
0.52mH
SPL @ 2.83Vrms/1m, 300-800Hz
86.0dB
SPL @ 1W/1m, 300-800Hz
85.2dB
Thiele/Small Paramters
Resonance frequency, fs
31Hz
Mechanical Q factor, Qms
5.6
Electrical Q factor, Qes
0.36
Total Q factor, Qts
0.34
Equivalent volume, Vas
26.0L
Effective piston area, Sd
132.7cm2
Effective piston diameter, D
13.0cm
Force factor, Bl
8.9N/A
Mechanical resistance, Rms
0.88kg/s
Moving mass, Mms
24.9g
Suspension compliance, Cms
1.04mm/N
Typical Box Tunings
Typical corner frequency, sealed B2 alignment
64.5Hz
Box volume, sealed B2 alignment
7.8L
Typical corner frequency, bass reflex PTT alignment
