AT3032 and instability in Sound Devices MixPre and 302, 442, MM-1, M

["Phil Tyler" macmang4125]

Hi
I was trying out a pair of AT3032's into a SD MixPre when the MixPre started to 
well 
'motorboat'!
The sound output was totally unusable and quite alarming! Spending some time 
investigating 
this problem I found that if you ran with 48V phantom power and the 80Hz bass 
cut switched 
in on the MixPre it would function normally. Or you could run with 15V phantom 
power and 
no 80Hz filter. The oscillation is dependent on headphone volume as well, so 
something to 
do with the power supply then, I though?
I contacted Sound Devices who got back to me saying this is a known problem 
with the 
MixPre and the 302, 442 etc. They even have a web page explaining it all at:

http://www.sounddevices.com/notes/mixers/oscillation-xfmr-inputs/

Thankfully it looks like you can run the AT3032's on 15V phantom OK. Phew!

Once over the initial problems I am quite impressed with the AT3032's and they 
make a very 
good addition to my kit of parts.

Phil





"While a picture is worth a thousand words, a 
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause


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