MONACOR SPH-255

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.7dB
• Frequency response 23 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 23Hz
• Mechanical quality factor QMS 2.86
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 158cm³
• Power handling P 60W
• Program power Pmax 120W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 1.5mH
• VC Diameter 50mm
• Winding material Aluminium

Magnet

• Force factor Bl 11.7N/A
• Motor constant Bl/√RE 4.74N/√W
• Diameter 140mm
• Weight 1.1kg

Diaphragm

• Effective diameter 211mm
• Effective area SD 350cm²
• Moving mass MMS 42g
• Moving mass (without air load) MMD 37.3g

Suspensions

• Stiffness KMS 0.84N/mm
• Compliance CMS 1190µm/N
• Equivalent volume to the compliance VAS 205L
• Mechanical resistance RMS 2.12N·s/m

Dimensions

• Nominal diameter 10″
• 257mm
• Overall diameter 257mm
• Baffle cutout diameter 235mm
• Overall depth 128mm
• Flange thickness 10mm
• Mounting depth 118mm
• Volume occupied by the driver (estimated) 1.6L
• Net weight 3.73kg