21inch PA speaker                                   
Glass fiber and paper cone with cloth surround                    
Black high gloss colour Die cast basket with paper gasket  
4-Layer CONEX material  spider  
Black zinc chromate plated top and bottom plate 
5-layer 127.2mm  BACCW  voice coil  
253mm 140*2 Oz magnet    
Nominal impedance:8ohms
DC Resistance:7.2ohms
F0:29HZ 
Rated music power:3000w
SPL:97db  Qms:7.2 Qes:0.46 Qts:0.43