HELIX PURE P 5B

• 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