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Welcome to the forum.........


To your first question, probably if you turn the voltage higher than 13.8v, you will need to know the limit to how much voltage you can put into it, but 15.5v should be fine. If you want more power output get a bigger amp............


When you say "Audio feedback" do you mean:

  * through other speakers (RFI) in the house?

  * through your transmit signal (RFI) being picked up by the mic and sent out with your signal?         

  * through the speaker on the radio that does not have "talkback" also known as RFI?

  * or is it something else?


Also, it's not polite to use all capital letters .... it's known as "screaming"