From: shaun.at.pukekohe@gmail.com   
      
   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.   
      
   I called them 12.5" drivers as that's what Wharfedale call them (as well as   
   contemporary reviews of the speakers). Also they need about 1/2" bigger   
   holes to mount them than three (so-called) 12" drivers I have here.   
      
   However I agree - and get very annoyed at the way drivers are 'sized' by   
   hole-to-hole - or chassis size. IMHO a cone-type speakers quoted size should   
   be the diameter of the cone - the same way a tweeter is sized by the   
   diameter of the diaphragm. Either that or the size of the hole required to   
   mount them.   
      
   So, just for you, they're 25cm drivers. That's the outside diameter of the   
   cones. Now, can you help me with sourcing (or making) surrounds for them?   
      
   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 asking for manufacturers to   
   'cheat' by having a really wide flange and spacing the holes all the way to   
   the edge.)   
   --   
   /Shaun.   
      
   "Humans will have advanced a long, long, way when religious belief has a   
   cozy little classification in the DSM."   
   David Melville (in r.a.s.f1)   
   [Sent from my OrbitalT ocular implant interface.]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)