SPCEIFICATINONS   
Nomin diameter :           380mm. 15in
Nomin al impe dance:    8 ohm
Power rating:                300W RM S                                   
Sensitivity (1w/1m) :     98dB±3dB
Frequency range:          45-3.5kHz
Voice Coil diameter :      φ75.5mm
Voice coil length:           18mm
Air gap height:               9mm
magnet dimension :       190mm*25mm 

THIELE & SMALL PARAMETERS
Resonace frequency,FS:                45Hz
D.C.Resistan ce,Re:                       6.5 ohm
Mechanical quality factor,Qms:      2.99
Electrical quality factor,Qes:          0.49
Total quality factor,Qts:                 0.42
Equivalent air volme to Cms,Vas:  132L
Mechanical compliance,Cms:          0.13mm/N
Bl factor,Bl:                                    18.9N/A
Effective surface area,Sd：            0.085㎡

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

MOUNTING INFORMATION
Overall diameter:         φ380mm
Bolt circle diameter:     φ388mm
Baffle cutout diameter:φ351mm
Depth:                         176mm
Net weight:                 8.8kg