Dayton Audio CF120-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.2dB
• Frequency response 50 - 15000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 53.2Hz
• Mechanical quality factor QMS 1.89
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 18cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 0.45mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 4.94N/A
• Motor constant Bl/√RE 2.68N/√W

Diaphragm

• Effective diameter 81mm
• Effective area SD 51.5cm²
• Moving mass MMS 6.9g
• Moving mass (without air load) MMD 6.6g

Suspensions

• Stiffness KMS 0.763N/mm
• Compliance CMS 1310µm/N
• Equivalent volume to the compliance VAS 4.87L
• Mechanical resistance RMS 1.22N·s/m

Dimensions

• Nominal diameter 4.5″
• 124mm
• Overall diameter 124mm
• Baffle cutout diameter 102mm
• Overall depth 59mm
• Volume occupied by the driver (estimated) 0.22L