MONACOR SPH-450TC

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.5dB
• Frequency response 20 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 20Hz
• Mechanical quality factor QMS 2.97
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 12.9mm
• Air volume displaced at xmax VD 1613cm³
• Power handling P 700W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 7.4Ω
• Inductance (1kHz, in series) LE 4.6mH
• VC Diameter 99.3mm
• Winding material Aluminium

Magnet

• Force factor (in series) Bl 32.4N/A
• Motor constant Bl/√RE 11.9N/√W
• Diameter 220mm
• Weight 5.7kg

Diaphragm

• Effective diameter 399mm
• Effective area SD 1250cm²
• Moving mass MMS 305g
• Moving mass (without air load) MMD 275g

Suspensions

• Stiffness KMS 4.55N/mm
• Compliance CMS 220µm/N
• Equivalent volume to the compliance VAS 480L
• Mechanical resistance RMS 12.9N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Baffle cutout diameter 425mm
• Overall depth 220mm
• Flange thickness 15mm
• Mounting depth 205mm
• Volume occupied by the driver (estimated) 8.8L
• Net weight 17.0kg