Potential line out converter problems

[ntech]

I have a 05 accord I installed a stereo into. I installed two amps, one is 150 watts powering a 300 10" subwoofer. The second is a 200 watt amp powering four cabin speakers (6x9", 6.5"). I kept the stock stereo head unit, and used a line out converter due to no RCA preouts. Upon receipt of the car, I had noticed a continual hissing sound in the speakers, when music is at low volume. It is similar to the sound a tape player makes when you press play. Could this be feedback or interference caused by the line out converter? If so, is there anything I can do to fix the problem? Is there any honda factory head units that have RCA preouts?

I am trying to avoid using a custom head unit, due to unwanted attention that may be attracted by potential thieves. Right now everything is hidden, and looks 100% stock from the outside, I would prefer to keep it that way.

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[johnecon2001 5,000+ posts]

More likely it's due to poor equipment selection, improper gain structure and dirty or loose grounds.

To fix those, read the gain setting tutorial in the amplifier section, sand the ground points and make sure they are clean and tight and start looking to upgrade.