SPCEIFICATINONS   
Nomin diameter :           380mm. 15in
Nomin al impe dance:    8 ohm
Power rating:                300W RM S                                   
Sensitivity (1w/1m) :     94dB±3dB
Frequency range:          51-2.5KHz
Voice Coil diameter :      φ75.5mm
Voice coil length:           17mm
Air gap height:               10mm
magnet dimension :       φ190mm*20mm

THIELE & SMALL PARAMETERS
Resonace frequency,FS:                51Hz
D.C.Resistan ce,Re:                       2*3.5 ohm
Mechanical quality factor,Qms:      2.1
Electrical quality factor,Qes:          0.38
Total quality factor,Qts:                 0.31
Equivalent air volme to Cms,Vas:  90L
Mechanical compliance,Cms:          0.88mm/N
Bl factor,Bl:                                    25.41N/A
Effective surface area,Sd：            0.085㎡

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

MOUNTING INFORMATION
Overall diameter:         φ385mm
Bolt circle diameter:     φ374mm
Baffle cutout diameter:φ355mm
Depth:                         165mm
Net weight:                 5kg