HELIX PURE S 3M

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86dB
• Frequency response 400 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 130Hz
• Mechanical quality factor QMS 4.47
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 6.4cm³
• Power handling P 75W
• Program power Pmax 150W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.17mH
• VC Diameter 25mm
• Winding height HVC 8mm

Magnet

• Force factor Bl 4.6N/A
• Motor constant Bl/√RE 2.57N/√W

Diaphragm

• Effective diameter 64mm
• Effective area SD 32cm²
• Moving mass MMS 3.8g
• Moving mass (without air load) MMD 3.7g

Suspensions

• Stiffness KMS 2.53N/mm
• Compliance CMS 396µm/N
• Equivalent volume to the compliance VAS 0.57L
• Mechanical resistance RMS 0.69N·s/m

Dimensions

• Nominal diameter 3″
• 75mm
• Overall diameter 90mm
• Baffle cutout diameter 73mm
• Mounting depth 37mm
• Volume occupied by the driver (estimated) 0.1L