SPCEIFICATINONS   
Nomin diameter :           385mm. 15in
Nomin al impe dance:    8 ohm
Power rating:                300W(LF)60w(HF)                                   
Sensitivity (1w/1m) :     100dB±3dB,105dB±3dB
Frequency range:          41-20kHz
Voice Coil diameter :      φ75.5mm 44.4MM
Voice coil length:           16mm
Air gap height:               10mm
magnet dimension :       φ180mm*20mm(LF)
                                      φ120mm*17mm(HF) 

THIELE & SMALL PARAMETERS
Resonace frequency,FS:                41Hz
D.C.Resistan ce,Re:                       5.5 ohm
Mechanical quality factor,Qms:      3.75
Electrical quality factor,Qes:          0.37
Total quality factor,Qts:                 0.33
Equivalent air volme to Cms,Vas:  223L
Mechanical compliance,Cms:          0.23mm/N
Bl factor,Bl:                                    16.97N/A
Effective surface area,Sd：            0.085㎡

MATERIALS
Basket:                     Steel
Cone and dust can : Paper(LF)
                                 Titanium(HF)
Surround:                 Treated cloth
Voice coil wire:         Copper(LF)
                                 Copper clad Al Ribbor(HF)
Voice coil bobbin:      Kapton
Magnet:                    Ferrite