HELIX PURE C 6B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 54Hz
• Mechanical quality factor QMS 11.10
• Electrical quality factor QES 0.55
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 41cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz, estimated) LE 0.51mH
• VC Diameter 37mm
• Winding height HVC 12mm

Magnet

• Force factor Bl 6.1N/A
• Motor constant Bl/√RE 3.31N/√W

Diaphragm

• Effective diameter 131mm
• Effective area SD 135cm²
• Moving mass MMS 17.8g
• Moving mass (without air load) MMD 16.6g

Suspensions

• Stiffness KMS 2.04N/mm
• Compliance CMS 490µm/N
• Equivalent volume to the compliance VAS 12.4L
• Mechanical resistance RMS 0.54N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 166mm
• Baffle cutout diameter 145mm
• Mounting depth 67mm
• Volume occupied by the driver (estimated) 0.51L