Eminence Josh Smith JS-1250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 100.2dB
• Frequency response 80 - 5200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 92Hz
• Mechanical quality factor QMS 15.69
• Electrical quality factor QES 0.63
• Total quality factor QTS 0.61

Large signal parameters

• Maximum linear excursion xmax 0.8mm
• Air volume displaced at xmax VD 41cm³
• Power handling P 50W
• Program power Pmax 100W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 0.5mH
• VC Diameter 44.4mm
• Winding material Copper
• Former material Nomex

Magnet

• Force factor Bl 12.9N/A
• Motor constant Bl/√RE 5.1N/√W
• Air gap height HAG 8mm
• Weight 1.077kg
• Material Ferrite

Diaphragm

• Effective diameter 257mm
• Effective area SD 520cm²
• Moving mass MMS 28g
• Moving mass (without air load) MMD 19.6g

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 41.2L
• Mechanical resistance RMS 1.03N·s/m
• Surround material Full molded paper

Dimensions

• Nominal diameter 12″
• 309mm
• Overall diameter 309mm
• Baffle cutout diameter 283mm
• Overall depth 133mm
• Volume occupied by the driver 2.01L
• Net weight 3.629kg
• Frame material Pressed Steel