Do I need tx's for this project?

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Hi all, I am finishing up this project, the "Taos Talkback mic-pre/mixer"http://www7.taosnet.com/f10/floobydust.htm

I am sending a balanced line level stereo pair from my headphone send to this mixer, and I need a balanced stereo pair of line level outputs to go to my headphone distro.
This "Taos" project is drawn for an unbalanced stereo input, labeled "Right HP Send In" and "Left HP Send In". The output is also unbalanced, labeled "Right Mix Out" and "Left Mix Out".
Do I need 4 600:600 ohm transformers, two on the input and two on the output? I am most likely going to order Edcor transformers.http://www.edcorusa.com/home.html

What do you think?
 
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