Purifi Audio PTT8.0X08-NAB-01

The PTT8.0X08-NAB-01 from Purifi Audio is an 8" (20cm) bass-midrange driver that offers negligible power factor modulation and surround radiation distortion. It is characterized by low magnetic hysteresis distortion and "true" long excursion performance, with distortion remaining low over the entire excursion. The bass-midrange driver delivers pristine midrange performance and is designed and manufactured in Denmark. Other features include a nominal impedance of 8 Ω, black anodized aluminum cone material and a linear excursion of ±9.3 mm.

• Negligible power factor modulation and bead-radiation distortion
• Low magnetic hysteresis distortion
• "True" long-stroke performance: distortion remains low over the entire stroke
• Unadulterated performance in the mid-range
• Developed and manufactured in Denmark

• Size: 8 inch
  
• Nominal impedance: 8 Ω
  
• Membrane material: Black anodized aluminium
  
• Linear deflection, Xlin: ±9.3 mm
  
• Maximum mechanical deflection, Xmax: ±15.0 mm
  
• Motor efficiency, beta: 19.1 (N/A)^2/Ω
  
• Efficiency bandwidth, EBP: 68.6 Hz
  
• Long-term maximum performance: TBD
  
• Rated noise power, 100 h TBD
  
• Electrical and acoustic parameters
  
• Direct current resistance 6.0 Ω
  
• Minimum impedance via resonance, Zmin 6.6 Ω
  
• Frequency for minimum impedance, fmin 223 Hz
  
• Maximum impedance, Zo 100 Ω
  
• Voice coil inductance at 1 kHz 0 mm, Le 0.33 mH
  
• SPL at 2.83 Vrms/1 m, 300-800 Hz 86.4 dB
  
• SPL at 1 W/1 m, 300-800 Hz 85.6 dB
  
• Thiele/Small parameters
  
• Resonant frequency, fs 24 Hz
  
• Mechanical Q-factor, Qms 5.8
  
• Electrical Q-factor, Qes 0.37
  
• Total Q-factor, Qts 0.35
  
• Equivalent volume, Vas 74.5 l
  
• Effective piston area, Sd 235.1 cm²
  
• Effective piston diameter, D 17.3 cm
  
• Force factor, Bl 10.7 N/A
  
• Mechanical resistance, Rms 1.22 kg/s
  
• Moving mass, Mms 47.6 g
  
• Suspension compliance, Cms 0.95 mm/N
  
• Typical box set-ups
  
• Typical cut-off frequency, sealed B2 alignment 48.5 Hz
  
• Box volume, sealed B2 alignment 24.2 l
  
• Typical cut-off frequency, bass reflex PTT orientation 24.2 Hz
  
• Box resonance, bass reflex PTT alignment 26.3 Hz
  
• Box volume, bass reflex PTT orientation 67.7 l
  
• Diameter of the bass reflex channel, PTT alignment 6.8 cm
  
• Length of the bass reflex channel, PTT alignment 23.1 cm
  
• Typical cut-off frequency, 2xPR PTT alignment 27.8 Hz
  
• Box volume, 2xPR PTT alignment 54.0 l
  
• PR mass per PR, 2xPR PTT alignment 124.3 g
  
• Properties of the voice coil
  
• Diameter of the voice coil 52 mm
  
• Length of voice coil 23.6 mm
  
• Layers of the voice coil 2
  
• Height of the air gap 5.0 mm
  
• Winding material CU
  
• Physical dimensions
  
• Basket diameter 221 mm
  
• Diameter of the cut-out 193 mm
  
• Diameter of the mounting hole pattern 210 mm
  
• Diameter of the mounting hole 5.2 mm
  
• Diameter of the magnet 140 mm
  
• Height of the outer flange 5.0 mm
  
• Installation depth 102.0 mm
  
• Weight 3.50 kg
  
• Displaced internal volume 0.64 l