Converting Coax to AES?

Can I just use a RCA to XLR adapter?

I realize it may not be optimal, but this is for my DirecTV box, not more critical sources.
Post removed 
Also the impedance difference will mess up the waveform.

Here is one solution, for $98, although I suspect that with a little looking you'll be able to find something less expensive (this one can handle two signals, which you don't need):

-- Al
Canare makes several models of impedance transformers that can adapt a coax cable to an AES input. I used to use one to connect a computer coax digital audio output to an AES input on my DAC because the DAC RCA coax input was being used to connect a cd player. The one I Used has a BNC type connection on the back so I used an RCA/BNC adapter to connect the coax cable. The model I used cost a little over 20 dollars and worked great for digital audio. It was recommened to me by the maker of my Grace M902 DAC. I found a Canare model BJC-XJ-TRB Impedance Transformer XLR Jack to BNC Jack when I did a Google search priced for $22.99.
Thanks guys--I ordered the Canare first. If that doesn't work, than the Hosa box will replace it.