Hi,
according to
http://www.lynxstudio.com/product_detail.asp?i=16 the AES 16e inputs and outputs are AES/EBU digital.
Therefore you should by a Lynx cable with AES/EBU connects like this one :
http://www.lynxstudio.com/product_detail.asp?i=41 Note that each AES/EBU in 1 stereo chanels.
Of course, you also need a DAC with AES input before going to the pre-amp (or a pre-amp with an AES digital input).
If you want more than 1 stero chanels, the card will allow you go up to 4 stereo chanels with one cable and 8 stereo chanels with a second cable.
In that case, you will need several stereo DACs but I am not sure if such a configuration would work for JRiver.
Information available on this topic is quite low, I have not found experience feed-back, there are discussions arround delay issue beteween each stereo chanel (but no conclusion and no test feed back, as far as I know), etc.?
In a word, multichanel in JRiver is a jungle for me at this stage.
Too bad, I think this functionality could be interesting, especially for convolution filtering (replacing electronic filtering in speackers).