HELIX IK S12

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.8dB

Thiele & Small parameters

• Resonance frequency (free air) fS 36Hz
• Mechanical quality factor QMS 5.41
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.48

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 418cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.1Ω
• Inductance (1kHz, in series, estimated) LE 2.49mH
• VC Diameter 50.8mm
• Winding height HVC 24mm

Magnet

• Force factor (in series) Bl 17.2N/A
• Motor constant Bl/√RE 9.77N/√W

Diaphragm

• Effective diameter 258mm
• Effective area SD 523cm²
• Moving mass MMS 220g
• Moving mass (without air load) MMD 211g

Suspensions

• Stiffness KMS 10.5N/mm
• Compliance CMS 95µm/N
• Equivalent volume to the compliance VAS 40L
• Mechanical resistance RMS 7.9N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 316mm
• Baffle cutout diameter 277mm
• Mounting depth 96mm
• Volume occupied by the driver (estimated) 2.7L