Probably the firmware update was just a coincidence and has nothing to
do with it.

With the first batch of SB2s we produced, there was a problem where the
headphone amplifier chip could act as a radio receiver, so the RF energy
from the 802.11 would be picked up by the headphone cable and then made
audible by the headphone amp. 

The solution to this is to add some small value caps (22pf) from each
of the headphone signals to ground. This shunts the high frequency RF
so it can not reenter the system. We can do this for you if you want to
send it in.

Otherwise the only workaround is to use ethernet, or try changing the
orientation of the headphone cable.


-- 
seanadams
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