Size
Surround #
IDmm
PDmm
CDmm
ODmm
  
4"
BC091W
72
79
91
99
  
5"
BC120W
92
101.4
120
132
  
6.5"
BC141W
113
122.4
141
153
  
7"
BC159W
125
137
159
174
  
8"
BC183W
149
161
183
196
  

patent No:

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main Why two-roll? cone assembly  

85212009 in Taiwan, 96230532.4 in China

Twin-roll rubber surrounds owns the benefit of

linearity and longer excursim, now available for :