Dayton Audio CE70PR-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 81.5dB
• Frequency response 85 - 13000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 109Hz
• Mechanical quality factor QMS 3.50
• Electrical quality factor QES 0.77
• Total quality factor QTS 0.63

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 9.8cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.31mH
• VC Diameter 20mm

Magnet

• Force factor Bl 3.11N/A
• Motor constant Bl/√RE 1.76N/√W

Diaphragm

• Effective diameter 56mm
• Effective area SD 24.6cm²
• Moving mass MMS 3.5g
• Moving mass (without air load) MMD 3.4g

Suspensions

• Stiffness KMS 1.64N/mm
• Compliance CMS 610µm/N
• Equivalent volume to the compliance VAS 0.523L
• Mechanical resistance RMS 0.68N·s/m

Dimensions

• Nominal diameter 2.5″
• 70mm
• Overall diameter 70mm
• Baffle cutout diameter 64mm
• Overall depth 41mm
• Volume occupied by the driver (estimated) 0.1L