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In the mid 80's, when I bought my first car radio/cassette/CD player to use in my Cessna 172RG, I bought a Kenwood model that only had preamp outputs.  This gave me the correct output level and impedance to plug directly into the intercom, and, since the unit had no power amps, I was not wasting power in audio power circuits that I did not need.  The current drawn by that Kenwood approached one ampere when loading a CD, and only drew 400 ma (.4 amperes) at all other times.  I had to feed it through a voltage converter since the 172RG has a 24 volt system.  I bought the Kenwood at Circuit City. Regards,
Harris Sullivan

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