HELIX COMPOSE Ci3 W165FM-S2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB
• Frequency response 60 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 74Hz
• Mechanical quality factor QMS 3.92
• Electrical quality factor QES 0.92
• Total quality factor QTS 0.74

Large signal parameters

• Maximum linear excursion xmax 3.7mm
• Air volume displaced at xmax VD 49cm³
• Power handling P 100W
• Program power Pmax 150W

Voice Coil

• Nominal impedance Z 2Ω
• DC resistance RE 1.8Ω
• Inductance (1kHz, estimated) LE 0.21mH
• VC Diameter 25mm
• Winding height HVC 11.3mm

Magnet

• Force factor Bl 3.5N/A
• Motor constant Bl/√RE 2.61N/√W

Diaphragm

• Effective diameter 130mm
• Effective area SD 133cm²
• Moving mass MMS 12.5g
• Moving mass (without air load) MMD 11.4g

Suspensions

• Stiffness KMS 2.7N/mm
• Compliance CMS 370µm/N
• Equivalent volume to the compliance VAS 8.8L
• Mechanical resistance RMS 1.48N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 165mm
• Baffle cutout diameter 142mm
• Mounting depth 61mm
• Volume occupied by the driver (estimated) 0.5L