--On 12 April 2018 09:36 +0100 Jack Reynolds
<jackreynolds...@gmail.com> wrote:

> There is an optimum radius of about 15mm, below which the bottom end
> begins to suffer I'm told. 

I would guess this is practical rather than theoretical; determined by
a combination of noise (because of the gain required in the
differences) and the difficulty of precise calibration at low
frequencies.

Paul

-- 
Paul Hodges

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