You should be able to use a dc blocking cap with a value of 10uf or 47uf at 100volts in series with pins 2/3 to block it out. You should try and find some nice Mylar caps, the only problem is they will be huge. You might have to make an in line box, using a nice steel Hammond project box. They make some that are very small just big enough to mount a panel mounted XLR on. If you don't want to do this your self I can build it for the cost of parts.
Chris Church
Here is an interesting idea from Audio upgrades.
This has some interesting info on caps and what types to use and why.
This was taken from a website link
http://www.allfouraudio.com/Capacitors-in-the-signal-chain-817726x1307.htm"Here's $.04.
Capacitors make a huge difference. Anyone versed in direct coupled gear
would know this. All electrolytic caps dampen transients. Their
dialectric absorbtion converts small signals into heat. This is a
filter effect.
You don't need to put huge Polyprop or mylar film caps in there as
large film caps are also slow due to their size. Bypassing the
electrolytic caps with small value high quality films overcomes the
losses presented by the electrolytics.
Good choices include WIMA from Germany or the exotics like MIT's,
InfiniCaps, etc.
For an experiment, try this: Replace the 47 uf phantom blocking caps
with either Rubycon Black Gates, Z series, Panasonic FM or Nichicon HE
caps. Install WIMA MKP-02 .01 uf, 250 volt polypropylene film caps
across them.
Report back.
Jim Williams
Audio Upgrades"