SPCEIFICATINONS   
Nomin diameter :           300mm. 12in
Nomin al impe dance:    8 ohm
Power rating:                250W RM S                                   
Sensitivity (1w/1m) :     97dB±3dB
Frequency range:          53-4kHz
Voice Coil diameter :      φ65.5mm
Voice coil length:           16mm
Air gap height:               10mm
magnet dimension :       180mm*20mm 

THIELE & SMALL PARAMETERS
Resonace frequency,FS:                53Hz
D.C.Resistan ce,Re:                       5.8ohm
Mechanical quality factor,Qms:      3.71
Electrical quality factor,Qes:          0.29
Total quality factor,Qts:                 0.27
Equivalent air volme to Cms,Vas:  63.5L
Mechanical compliance,Cms:          0.161mm/N
Bl factor,Bl:                                    19.6N/A
Effective surface area,Sd：            0.054㎡

MATERIALS
Basket:                     Aluminium
Cone and dust can : Paper
Surround:                 Treated cloth
Voice coil wire:         Copper
Voice coil bobbin:      Glass Fibre
Magnet:                    Ferrite 

MOUNTING INFORMATION
Overall diameter:         φ315mm
Bolt circle diameter:     φ300mm
Baffle cutout diameter:φ295mm
Depth:                         135mm
Net weight:                 6kg