Does XLR-RCA converter work for digital?

First: is the output in the same form as the EQ?
The most common use of XLR in digital is AES-EBU format. The RCA is similar, but not the same format! RCA is in SPDIF format. They do NOT fit together like an ordinary connector!
Checkout Wikipedia "spdif" and see the different parameters.

SPDIF is 75 ohms, AES/EBU is 110 ohms - which is what Rotarius was saying in the first post

Wikipedia sez that SPDIF is "essentially" a consumer version of AES using consumer connectors - but AES 110/XLR is balanced (why it is used in pro installations) whereas SPDIF is single ended (why you find it on a consumer unit).

As I understand SPDIF was developed by the Sony CD consortium as a tool for testing - it would make sense that they were familiar with and used part or all of the AES (Audio Engineering Society) standard.

So the conversion may or may not be complex - best bet is to call Behringer

Thnx for the thread - I read the article and it still escapes me how they are EQing before the bits are decoded

No doubt however that good EQ is a wonderful thing

Also the voltage is a factor of 10 different from SPDIF and the AES EBU. Ten times the voltage coming out of the Beringer,and ten times less going in ain't gonna work.

Your best bet is to get a convertor box which fully converts from one format to another. Something like this from Hosa..
http://www.sweetwater.com/store/detail/CDL313/