HELIX IK W8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 37Hz
• Mechanical quality factor QMS 3.56
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.41

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 175cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.3Ω
• Inductance (1kHz, in series, estimated) LE 1.23mH
• VC Diameter 50.8mm
• Winding height HVC 24mm

Magnet

• Force factor (in series) Bl 10.7N/A
• Motor constant Bl/√RE 5.89N/√W

Diaphragm

• Effective diameter 167mm
• Effective area SD 219cm²
• Moving mass MMS 69g
• Moving mass (without air load) MMD 66.6g

Suspensions

• Stiffness KMS 3.82N/mm
• Compliance CMS 262µm/N
• Equivalent volume to the compliance VAS 17L
• Mechanical resistance RMS 4.54N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 214mm
• Baffle cutout diameter 182mm
• Mounting depth 101mm
• Volume occupied by the driver (estimated) 0.98L