HELIX K 12W

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 3.70
• 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 412cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.2Ω
• Inductance (1kHz, in series, estimated) LE 1.85mH
• VC Diameter 50.8mm
• Winding height HVC 24mm

Magnet

• Force factor (in series) Bl 13.7N/A
• Motor constant Bl/√RE 7.66N/√W

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 134g
• Moving mass (without air load) MMD 126g

Suspensions

• Stiffness KMS 5.59N/mm
• Compliance CMS 179µm/N
• Equivalent volume to the compliance VAS 66L
• Mechanical resistance RMS 7.33N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 316mm
• Baffle cutout diameter 286mm
• Mounting depth 144mm
• Volume occupied by the driver (estimated) 2.7L