The noise issues in the above posts are probably from improper setup. It sounds like there is too much gain. Try lowering the gain on whatever input you are using on the Rhea and see if that helps.
You can also have a problem with mixing balanced and se components. Can you post a list of your system? Make sure to include everything. Cables, tweaks etc.
You can also have a problem with mixing balanced and se components. Can you post a list of your system? Make sure to include everything. Cables, tweaks etc.