I'm Audioengine they can give you the exact answer, but I would not recommend sending speaker-level signals to the AW1. The instructions specifically call for "RCA outputs" from receivers. I don't see any spec on the input stage, but I've got a feeling that sending a speaker-level signal will fry it.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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I'm Audioengine they can give you the exact answer, but I would not recommend sending speaker-level signals to the AW1. The instructions specifically call for "RCA outputs" from receivers. I don't see any spec on the input stage, but I've got a feeling that sending a speaker-level signal will fry it.