hissing from tweeters please help $20 whoever helps solve problem

[rxzoco]

hello guys

i am having a issue i have a 2004 sl55

i did a full sound system on it

and the tweeters are having a hissing noise from tweeters when car is idle

there is no hissing noise when car is just ignition on

i have 3 way focal krx3 for the fronts

powered by phoenix gold ti 1000\4

very thick monster cable rca

subwoofer 13" w5 shallow

powerd by a jl audio 500\1

with the new pioneer double din

with a monster cap

i have tried gounding it on battery to see what happens makes a worse hissing noise

now im using the ground near the pse pump which is a very firm ground

i have check rca speaker wire everything is monster cable

any idea? i even put a isolator ground loop still hissing

when i rev it no engine noise just hiss

please someone help should i ground it better i even try grounding the rca makes it worse

please help

i already try removing the rca and hissing noise still coming from tweeters im thinking

maybe bad cap? or bad deck? please help

ill personally paypal you $20 if your idea works please help thx

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[pickup1 5,000+ posts]

Does your passive crossover have a way to turn the tweeter down some?..some passives have a 0 & -3 db setting.

Or look at your equalizer And turn the 10k band down some...or What Ever is the highest band.