Re: High freq noise after install?
I had this same problem with the first Kenwood HU I bought. What you can do to narrow the problem down is to get an 1/8" stereo to RCA adapter cable and a set of RCA couplers. Use an Ipod or other music device, to connect direct to your amp. If the noise is still there, you have eliminated the HU and RCA cables from the problem. If its gone, then reconnect your RCA cable to your amp and connect the ipod to your installed RCA cables and check those.
Here are some links of the cable and adapters i am talking about.
3-Ft. 1/8 Stereo to Dual Phono (RCA) Plug Y-Cable : Y-Cables | RadioShack.com
RCA Phono Plug Coupler (2-Pack) : Couplers | RadioShack.com
Vehicle: '99 Ford F-150 Extended Cab / '98 Chevy Cavalier LS
Head Unit: Kenwood KDC-X997 / Kenwood KIV-BT900 w/ HD Radio
Sub: FI Audio x12 4ohm w/BP 1cu ft sealed / 2 GTO804's 1.4 cu ft @28Hz
Sub Amp: Hifonics BRZ1700.1d /
Front Door Speakers: Massive Audio CK6 / Massive Audio CK6x
Rear Door Speakers: Boston Acoustics SL80 / Massive Audio VX69
Amp: MBQuart DSC4125 / Massive Audio NX5
Wiring: All Knukonceptz
Sound Deadening: eDead 45 / AT60 / Murder mat BL
References: Retroaudioinc, davidtemple, cd6551, double07, Ssteele18