HELIX IK S8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 43Hz
• Mechanical quality factor QMS 4.79
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.51

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 133cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.6Ω
• Inductance (1kHz, in series, estimated) LE 1.5mH
• VC Diameter 50.8mm
• Winding height HVC 19mm

Magnet

• Force factor (in series) Bl 11.9N/A
• Motor constant Bl/√RE 6.27N/√W

Diaphragm

• Effective diameter 168mm
• Effective area SD 222cm²
• Moving mass MMS 82g
• Moving mass (without air load) MMD 79.5g

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 11L
• Mechanical resistance RMS 4.7N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 213mm
• Baffle cutout diameter 180mm
• Mounting depth 80mm
• Volume occupied by the driver (estimated) 0.96L