Try a pair of twisted noise cancelling RCA's. Multiple brands sell them. They are pricey but worth it. They took out a nasty whine I had a while back when I was still using the monsoon system. Nothing compares to a good install, but the more electronics that are in a car, the harder it is to avoid.
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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