HELIX PURE P 5B

Mid Bass

Nominal diameter5″ / 130 mm
Resonance71 Hz
Q factor0.44
Sensitivity87.1 dB
Linear excursion± 3 mm
Program Power160 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 87.1dB
  • Frequency response 60 - 5500Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 71Hz
  • Mechanical quality factor QMS 5.82
  • Electrical quality factor QES 0.47
  • Total quality factor QTS 0.44

Large signal parameters

  • Maximum linear excursion xmax 3mm
  • Air volume displaced at xmax VD 24cm³
  • Power handling P 80W
  • Program power Pmax 160W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.5Ω
  • Inductance (1kHz, estimated) LE 0.35mH
  • VC Diameter 25mm
  • Winding height HVC 12mm

Magnet

  • Force factor Bl 5.6N/A
  • Motor constant Bl/√RE 2.99N/√W

Diaphragm

  • Effective diameter 100mm
  • Effective area SD 79cm²
  • Moving mass MMS 9.6g
  • Moving mass (without air load) MMD 9.1g

Suspensions

  • Stiffness KMS 1.92N/mm
  • Compliance CMS 522µm/N
  • Equivalent volume to the compliance VAS 4.5L
  • Mechanical resistance RMS 0.73N·s/m

Dimensions

  • Nominal diameter 5
  • 130mm
  • Overall diameter 129mm
  • Baffle cutout diameter 111mm
  • Mounting depth 63mm
  • Volume occupied by the driver (estimated) 0.26L


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