MONACOR SPX-31M

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.8dB
• Frequency response 110 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 110Hz
• Mechanical quality factor QMS 3.71
• Electrical quality factor QES 0.69
• Total quality factor QTS 0.58

Large signal parameters

• Maximum linear excursion xmax 1.1mm
• Air volume displaced at xmax VD 3.5cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 0.18mH
• VC Diameter 20mm
• Winding material Kapton

Magnet

• Force factor Bl 3.64N/A
• Motor constant Bl/√RE 1.44N/√W
• Diameter 68mm
• Weight 0.119kg

Diaphragm

• Effective diameter 64mm
• Effective area SD 32cm²
• Moving mass MMS 1.9g
• Moving mass (without air load) MMD 1.8g

Suspensions

• Stiffness KMS 1.09N/mm
• Compliance CMS 920µm/N
• Equivalent volume to the compliance VAS 1.32L
• Mechanical resistance RMS 0.35N·s/m

Dimensions

• Nominal diameter 3″
• 93mm
• Overall diameter 93mm
• Baffle cutout diameter 71mm
• Overall depth 55mm
• Flange thickness 2mm
• Mounting depth 53mm
• Volume occupied by the driver (estimated) 0.13L
• Net weight 0.49kg