I like soundhound's idea here if you are going to be using XLR's at the speaker. The biggest concern I have with the injectors is the added complexity of the signal path - introducing additional devices into the path inevitably offers more opportunities for signal degradation, and I don't know how transparent the injectors would really be. Powered speakers are a very logical approach, so the basic idea is excellent, but unbalanced may be the cleaner approach.
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gonk
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