HELIX COMPOSE CB C87.2-S3

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.9dB
• Frequency response 110 - 22000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 92Hz
• Mechanical quality factor QMS 3.80
• Electrical quality factor QES 0.74
• Total quality factor QTS 0.62

Large signal parameters

• Maximum linear excursion xmax 2.2mm
• Air volume displaced at xmax VD 7.9cm³
• Power handling P 40W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 3Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz, estimated) LE 0.16mH
• VC Diameter 25mm
• Winding height HVC 8.3mm

Magnet

• Force factor Bl 2.9N/A
• Motor constant Bl/√RE 1.67N/√W

Diaphragm

• Effective diameter 68mm
• Effective area SD 36cm²
• Moving mass MMS 3.6g
• Moving mass (without air load) MMD 3.4g

Suspensions

• Stiffness KMS 1.22N/mm
• Compliance CMS 820µm/N
• Equivalent volume to the compliance VAS 1.5L
• Mechanical resistance RMS 0.52N·s/m

Dimensions

• Nominal diameter 3.5″
• 87mm
• Overall diameter 87mm
• Baffle cutout diameter 79mm
• Mounting depth 42mm