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I had failed to mention earlier that I am running  4 rack units for superb voice communication that I want as clean as I can get. I understand I probably am the only fool trying to make a 503 sound well. This is just what I have and I try to make the best of it. I'll post the results of the experiment for all to know. If it works with clean audio and 150 clean smooth problem free watts, I'll buy another and repeat. I don't think that is asking a lot out of the unit.