september.org> ccffb784
From: zekor@comcast.net
"~misfit~" wrote:
> 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.)
Because that is the size you want to bolt into existing holes. That's the
way I have always gone by.
Greg
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