MONACOR SPH-300CTC

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.8dB
• Frequency response 18 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 18Hz
• Mechanical quality factor QMS 6.50
• Electrical quality factor QES 0.20
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 5.4mm
• Air volume displaced at xmax VD 267cm³
• Power handling P 300W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 2 x 8Ω
• DC resistance (in series) RE 12.0Ω
• Inductance (1kHz, in series) LE 4.4mH
• VC Diameter 62mm
• Winding material Kapton

Magnet

• Force factor (in series) Bl 24.2N/A
• Motor constant Bl/√RE 6.99N/√W
• Diameter 180mm
• Weight 1.8kg

Diaphragm

• Effective diameter 251mm
• Effective area SD 495cm²
• Moving mass MMS 100g
• Moving mass (without air load) MMD 92g

Suspensions

• Stiffness KMS 1.33N/mm
• Compliance CMS 750µm/N
• Equivalent volume to the compliance VAS 225L
• Mechanical resistance RMS 1.74N·s/m

Dimensions

• Nominal diameter 12″
• 308mm
• Overall diameter 308mm
• Baffle cutout diameter 272mm
• Overall depth 130mm
• Flange thickness 12mm
• Mounting depth 118mm
• Volume occupied by the driver (estimated) 2.6L
• Net weight 6.32kg