Background amplification and voice blur on phone call

Rask Ingemann Lambertsen ccc94453 at
Sun Jul 12 03:05:38 CEST 2009

On Thu, Jul 09, 2009 at 08:27:40PM +0400, Paul Fertser wrote:
> >>
> >> That's the difference you see between extra-cap units and
> >> not. Supposedly you have a capless unit and is using too much
> >> amplification for the earpiece in the codec. (FYI nobody knows for
> >> sure and there's no way to know which units have those stupid caps and
> >> which do not. Looks like all A7 units have them, as probably most of A5;
> >> my A6 doesn't)
> Basically it's assumed that some units have 1uF caps in place of
> R3004/R3005 (which should be 0R).

   R3004/R3005 are in the signal path to the earpiece speaker. If they are
instead 1 uF capacitors, that will reduce the bass. If this hardware bug has
been reintroduced on the A7 units, then that's sad.

   On the component placement diagram or the assembly silkscreen, you'll
find them at the lower left or right corner of U3001.

Rask Ingemann Lambertsen
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