On Thu, Apr 12, 2018 at 10:12:48AM +0100, Paul Hodges wrote: > --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.
The radius would matter if omni capsules are used. In that case the practical lower limit if you want the 1st order response to go down to the 20-50 Hz range is around the size of the Eigenmic, somwat more than 15 mm radius. And even then that requires very careful calibration and stability. Tetrahedral mics use near cardioid capsules, and extracting the first order AMB components doesn't require a minimum distance between them. Ciao, -- FA _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
