Email sonSundown : New 2012 Frames / Parts Thread
Each surround has the following calculated geometric capacity :
10 -- 50mm one-way (frame allows 45)
12 -- 55mm one-way (frame allows 50)
15 -- 60mm one-way (frame allows 55)
In order to allow for such high throw they must be very large.
Bottom line -- almost no surround produced anywhere else allows this level of throw so these do look "odd" compared to what is generally available.