Re: AT3032 and instability in Sound Devices MixPre and 302, 442, MM-

["Curt Olson" flipov411]

Thank you for this heads up!

Curt Olson


Phil Tyler wrote:

> 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.