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The noise could be induced AC noise from power cables. If you haven't already, check the power cables to route them as far as possible from sound cables. If they have to be close, cross them at 90 degree angle.
And Circuit City (and others) offer noise reduction kits.
I'm interested in hearing how it goes. I'm no audiophile, but I might copy your install if the noise is tolerable over time.
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Mike
04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop
70 914-6 - Black over tan, original/stock
PCA since 1970
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