From: trevor@home.net   
      
   "~misfit~"  wrote in message   
   news:kvbqm7$lgh$1@dont-email.me...   
   > Somewhere on teh intarwebs DecadentLinuxUserNumeroUno wrote:   
   >> On Mon, 22 Jul 2013 00:26:27 +1200, "~misfit~"   
   >>  wrote:   
   >>> Alas, on getting them home I discovered that the 'rubber' surrounds   
   >>> of the 12.5" woofers had gone hard   
   >>   
   >>  There is no such animal.   
   >>   
   >>  You measure the speaker size by measuring the bolt circle diameter,   
   >> not the outside rim of the speaker.   
   >   
   > Oh, wait a minute. WTF do you mean by the "bolt circle diameter"? Do you   
   > mean the mounting holes? Because, if you do I've just measured these and   
   > they're *exactly* 12.5" from the centre of one bolt-hole to the centre of   
   > the opposite one. I guess that could be referred to as the "bolt circle   
   > diameter".   
   >   
   > (Although *why* anyone would want to use that measurement as a driver size   
   > instead of the cone diameter is beyond me.   
      
   It's just historical, and important if you want a drop in replacement, but   
   your measurement does prove the lie to the claim "There is no such animal",   
   and why it is difficult to obtain replacement surrounds.   
      
      
   >It's asking for manufacturers to 'cheat' by having a really wide flange and   
   >spacing the holes all the way to the edge.)   
      
   For comparison and TS measurement purposes active cone area is used instead,   
   so not a problem.   
      
   Trevor.   
      
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