HELIX COMPOSE Ci7 W165FM-S3

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.1dB
• Frequency response 50 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 3.00
• Electrical quality factor QES 0.68
• Total quality factor QTS 0.55

Large signal parameters

• Maximum linear excursion xmax 3.7mm
• Air volume displaced at xmax VD 49cm³
• Power handling P 150W
• Program power Pmax 225W

Voice Coil

• Nominal impedance Z 3Ω
• DC resistance RE 2.9Ω
• Inductance (1kHz, estimated) LE 0.39mH
• VC Diameter 37mm
• Winding height HVC 13.4mm

Magnet

• Force factor Bl 4.8N/A
• Motor constant Bl/√RE 2.82N/√W

Diaphragm

• Effective diameter 129mm
• Effective area SD 131cm²
• Moving mass MMS 14.8g
• Moving mass (without air load) MMD 13.7g

Suspensions

• Stiffness KMS 2.08N/mm
• Compliance CMS 480µm/N
• Equivalent volume to the compliance VAS 11.6L
• Mechanical resistance RMS 1.83N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 165mm
• Baffle cutout diameter 142mm
• Mounting depth 66mm
• Volume occupied by the driver (estimated) 0.5L