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<blockquote data-quote="Yuzna" data-source="post: 1978462" data-attributes="member: 569461">I have a Ponitac Grand Prix and I recently replaced both the amp and the HU. There was a high pitched sound coming out of the speakers, and I was told the amp was the problem, so I replaced it and nothing changed (except for the fact that the high pitch sound moved from the front speakers to the rear //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif ). Then I replaced the HU and the problem went away. Now this high pitched sound has been replaced by a low buzzing sound whenever the HU is turned on (sounds like it is coming from all the speakers). It doesn&#039;t seem to increase when driving, and as soon as the music is higher than 4 or 5 on the unit you cannot really hear it anymore since the music drowns it out. I have also noticed that when I change input modes you can hear that through the speakers in the form of clicking and a signal sound (The AUI is truned off so that can&#039;t be it). Anyone know what this can be and how I can solve it? I am bringing it back today to where they installed it, but if this doesn&#039;t work, it would be nice to know what too do.The HU is a Pioneer DEH-P780MP and the Amp is Alpine MRP-F250.Any input would be great //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</blockquote>

[QUOTE="Yuzna, post: 1978462, member: 569461"] I have a Ponitac Grand Prix and I recently replaced both the amp and the HU. There was a high pitched sound coming out of the speakers, and I was told the amp was the problem, so I replaced it and nothing changed (except for the fact that the high pitch sound moved from the front speakers to the rear [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] ). Then I replaced the HU and the problem went away. Now this high pitched sound has been replaced by a low buzzing sound whenever the HU is turned on (sounds like it is coming from all the speakers). It doesn't seem to increase when driving, and as soon as the music is higher than 4 or 5 on the unit you cannot really hear it anymore since the music drowns it out. I have also noticed that when I change input modes you can hear that through the speakers in the form of clicking and a signal sound (The AUI is truned off so that can't be it). Anyone know what this can be and how I can solve it? I am bringing it back today to where they installed it, but if this doesn't work, it would be nice to know what too do. The HU is a Pioneer DEH-P780MP and the Amp is Alpine MRP-F250. Any input would be great [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]

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