Dayton Audio Signature SIG120-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.1dB
• Frequency response 75 - 8500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 74.6Hz
• Mechanical quality factor QMS 4.84
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 23cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.22mH
• VC Diameter 26.6mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Force factor Bl 5N/A
• Motor constant Bl/√RE 2.6N/√W
• Material Ferrite

Diaphragm

• Effective diameter 85mm
• Effective area SD 56.4cm²
• Moving mass MMS 6.7g
• Moving mass (without air load) MMD 6.4g
• Material Aluminum

Suspensions

• Stiffness KMS 1.47N/mm
• Compliance CMS 680µm/N
• Equivalent volume to the compliance VAS 3.1L
• Mechanical resistance RMS 0.65N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 120mm
• Overall diameter 123mm
• Baffle cutout diameter 95mm
• Overall depth 56mm
• Volume occupied by the driver (estimated) 0.2L
• Frame material Cast Aluminium