HELIX PURE S 6B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.2dB
• Frequency response 45 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 67Hz
• Mechanical quality factor QMS 3.87
• Electrical quality factor QES 0.96
• Total quality factor QTS 0.77

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 42cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz, estimated) LE 0.45mH
• VC Diameter 25mm
• Winding height HVC 12mm

Magnet

• Force factor Bl 4.8N/A
• Motor constant Bl/√RE 2.6N/√W

Diaphragm

• Effective diameter 134mm
• Effective area SD 141cm²
• Moving mass MMS 14.8g
• Moving mass (without air load) MMD 13.6g

Suspensions

• Stiffness KMS 2.7N/mm
• Compliance CMS 370µm/N
• Equivalent volume to the compliance VAS 10.3L
• Mechanical resistance RMS 1.64N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 165mm
• Baffle cutout diameter 143mm
• Mounting depth 65mm
• Volume occupied by the driver (estimated) 0.5L