MONACOR SP-40

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.7dB
• Frequency response 80 - 10000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 80Hz
• Mechanical quality factor QMS 2.50
• Electrical quality factor QES 0.97
• Total quality factor QTS 0.70

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 11cm³
• Power handling P 8W
• Program power Pmax 16W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.5Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 25.5mm
• Winding material Aluminium

Magnet

• Force factor Bl 4.33N/A
• Motor constant Bl/√RE 1.7N/√W
• Diameter 70mm
• Weight 0.15kg

Diaphragm

• Effective diameter 84mm
• Effective area SD 55cm²
• Moving mass MMS 5.7g
• Moving mass (without air load) MMD 5.4g

Suspensions

• Stiffness KMS 1.61N/mm
• Compliance CMS 620µm/N
• Equivalent volume to the compliance VAS 2.6L
• Mechanical resistance RMS 1.15N·s/m

Dimensions

• Nominal diameter 4″
• 103 x 103mm
• Overall size 103 x 103mm
• Baffle cutout diameter 95mm
• Overall depth 55mm
• Flange thickness 4mm
• Mounting depth 51mm
• Volume occupied by the driver (estimated) 0.14L
• Net weight 0.46kg