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Again, why is the modulator only producing 14W peak?  The 2290 with an 8W input from the radio should put out 50W @12.5V and automobiles circuits when running as well as power supplies in your house operate at 13.8V which increases the output of the amp.  SO, why is the modulator only producing a 3W carrier and 14W peak?  14W isn't much more than the 8W coming out of the radio so it doesn't surprise me that you 500 isn't producing much extra when the Mod is inline.