[sdiy] THAT2180A

[Guy McCusker]

I found this Muffwiggler post from Graham Hinton somewhat interesting
on the question of "correct" panning law.
https://www.muffwiggler.com/forum/viewtopic.php?p=1674967#p1674967

Graham suggests that not only is the level in the centre important,
but there are also interesting perceptual effects near the edges of
the pan. In the context of our discussion here, that's relevant
because two distinct "3dB" laws have been proposed: the sin/cos one
and the square root one. Both result in 3dB attenuation in the centre.
Have I read between the lines correctly to infer that this results in
a "bump" in perceived loudness in the centre, hence the use of 4 or
4.5dB laws.?

Anyway, the sin/cos and sqrt laws agree in the centre and differ at
the edges. The THAT app note circuit has configurable gain at the
centre but is trying to approximate the sin/cos law I guess. None of
this gets us closer to knowing what the BBC law that Graham Hinton
mentions actually looks like.

On Mon, Nov 30, 2020 at 8:23 AM Mattias Rickardsson <mr at analogue.org> wrote:
>
> Tom,
>
> Den mån 30 nov. 2020 01:12 Tom Wiltshire <tom at electricdruid.net> skrev:
>>
>> ...
>> Neither sounds “even”. The ideal is something that gives a sound that seems to rotate around you with you at the centre, not moving closer or further away. The exact listening set-up obviously will affect how that illusion is to be created, but the aim is pretty clear.
>
>
> To complicate things even more, the "ideal" control curve is also frequency dependent, since higher frequencies are attenuated more when bending around your head. A certain pan solution with only plain VCAs will never sound exactly "right" (sic) for most sounds.
>
> (Do professional panning products (mixing consoles, DAWs, etc) EQ the left/right signals differently when off-center, or is everyone still using pure level controls?)
>
> Once again it seems like the lowpass gate is the perfect module for the job!  8-)
>
> /mr
>
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