MONACOR SP-45/4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.2dB
• Frequency response 120 - 16000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 120Hz
• Mechanical quality factor QMS 2.82
• Electrical quality factor QES 0.68
• Total quality factor QTS 0.55

Large signal parameters

• Maximum linear excursion xmax 0.8mm
• Air volume displaced at xmax VD 2.3cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.1mH
• VC Diameter 19mm
• Winding material Aluminium

Magnet

• Force factor Bl 2.4N/A
• Motor constant Bl/√RE 1.32N/√W
• Diameter 70mm
• Weight 0.15kg

Diaphragm

• Effective diameter 63mm
• Effective area SD 31cm²
• Moving mass MMS 1.6g
• Moving mass (without air load) MMD 1.5g

Suspensions

• Stiffness KMS 0.909N/mm
• Compliance CMS 1100µm/N
• Equivalent volume to the compliance VAS 1.5L
• Mechanical resistance RMS 0.43N·s/m

Dimensions

• Nominal diameter 3″
• 78 x 78mm
• Overall size 78 x 78mm
• Baffle cutout diameter 72mm
• Overall depth 43mm
• Flange thickness 0mm
• Mounting depth 43mm
• Volume occupied by the driver (estimated) 0.12L
• Net weight 0.412kg