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<blockquote data-quote="Bun-Bun" data-source="post: 7709103" data-attributes="member: 584852"><p>Ok so I have this whine coming from my speakers. Had alternator whine as well but fixed that mostly by going straight to the battery from the HU (was on stock wiring).</p><p></p><p>The whine starts a few seconds after turning on the system, builds up for a bit and then stays a constant but slightly wavering high pitched whine. This is present whether the ignition is on or off and with the engine running or not.</p><p></p><p>Two things make the sound stop. 1. Unplugging the RCA's from the 4 channel amp. 2. or turning off the sub amp (disconnecting the remote wire).</p><p></p><p>My system is as follows.</p><p></p><p>Alpine CDA-9887 head unit</p><p></p><p>Alpine PDX4.150 amp</p><p></p><p>Memphis MC1.1500 MClass sub amp (1100wrms x1)</p><p></p><p>Memphis MClass Components (15-MCS6 )</p><p></p><p>Memphis MClass Coaxial 6x9's</p><p></p><p>Memphis Power Reference 10" subs x 4</p><p></p><p>1/0 gauge wire running from front battery to alternator, starter, body. 4 gauge running from front battery to fuse box. 1/0 gauge (pos and neg) running from front battery to back battery underneath the car strapped to the frame. 1/0 gauge running from back battery to distribution blocks (pos and neg with pos being fused for each amp). 4 gauge running from distro blocks to amps. 8 gauge running from HU to back battery (pos and neg).</p><p></p><p>I have tried disconnecting the antennae. I have checked with a volt meter RCA shield to HU casing has continuity (less than 1 ohm). I have checked with a volt meter RCA connectors on amps to ground have no continuity (greater than 20Mohm). I have very little to no alternator whine with headlights off. I have a little bit of whine with headlights on (I suspect that is the dimmer switch wire to the HU).</p><p></p><p>I am ripping my hair out over this. And trust me... thats difficult being that I am bald! Help! TIA</p><p></p><p>Build log <a href="http:////forums/car-audio-build-logs-cars-trucks-suvs/334371-2007-grand-marquis-ultimate-build-log.html" target="_blank">http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/334371-2007-grand-marquis-ultimate-build-log.html</a></p></blockquote><p></p>
[QUOTE="Bun-Bun, post: 7709103, member: 584852"] Ok so I have this whine coming from my speakers. Had alternator whine as well but fixed that mostly by going straight to the battery from the HU (was on stock wiring). The whine starts a few seconds after turning on the system, builds up for a bit and then stays a constant but slightly wavering high pitched whine. This is present whether the ignition is on or off and with the engine running or not. Two things make the sound stop. 1. Unplugging the RCA's from the 4 channel amp. 2. or turning off the sub amp (disconnecting the remote wire). My system is as follows. Alpine CDA-9887 head unit Alpine PDX4.150 amp Memphis MC1.1500 MClass sub amp (1100wrms x1) Memphis MClass Components (15-MCS6 ) Memphis MClass Coaxial 6x9's Memphis Power Reference 10" subs x 4 1/0 gauge wire running from front battery to alternator, starter, body. 4 gauge running from front battery to fuse box. 1/0 gauge (pos and neg) running from front battery to back battery underneath the car strapped to the frame. 1/0 gauge running from back battery to distribution blocks (pos and neg with pos being fused for each amp). 4 gauge running from distro blocks to amps. 8 gauge running from HU to back battery (pos and neg). I have tried disconnecting the antennae. I have checked with a volt meter RCA shield to HU casing has continuity (less than 1 ohm). I have checked with a volt meter RCA connectors on amps to ground have no continuity (greater than 20Mohm). I have very little to no alternator whine with headlights off. I have a little bit of whine with headlights on (I suspect that is the dimmer switch wire to the HU). I am ripping my hair out over this. And trust me... thats difficult being that I am bald! Help! TIA Build log [URL="http:////forums/car-audio-build-logs-cars-trucks-suvs/334371-2007-grand-marquis-ultimate-build-log.html"]http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/334371-2007-grand-marquis-ultimate-build-log.html[/URL] [/QUOTE]
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