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<blockquote data-quote="Vern Dee" data-source="post: 7886184" data-attributes="member: 644991">Rob,First, thanks for the help and suggestions, and the answer is no to all of those questions. I orders high quality shielded RCA cables, I ran separate 8 gauge ground and powers wires on the opposite side of the car from the RCAs, so that the head unit and the Amp are both grounded to the same chassis point in the trunk near the battery.As far as ruining my 740i...I didn&#039;t just randomly take out the $3,000 BMW factory system for the fun of it, it went bad, and had to be replaced. I actually sold the original system parts (even the bad ones), on eBay, for more that the new head unit and amp cost.&nbsp; Again, except for the alternator whine, I love the 931NB. I&#039;ve seen lots of other threads that mention alternator whine problems with all of the major, more expensive brands. So except for this alternator noise, the unit works and sounds incredible, and I have a 4 years replacement warranty that was only about $45.Please tell me if there are special noise suppressors or any other solutions for the alternator whine.&nbsp;&nbsp; Thank you, Vern</blockquote>

[QUOTE="Vern Dee, post: 7886184, member: 644991"] Rob, First, thanks for the help and suggestions, and the answer is no to all of those questions. I orders high quality shielded RCA cables, I ran separate 8 gauge ground and powers wires on the opposite side of the car from the RCAs, so that the head unit and the Amp are both grounded to the same chassis point in the trunk near the battery. As far as ruining my 740i...I didn't just randomly take out the $3,000 BMW factory system for the fun of it, it went bad, and had to be replaced. I actually sold the original system parts (even the bad ones), on eBay, for more that the new head unit and amp cost. Again, except for the alternator whine, I love the 931NB. I've seen lots of other threads that mention alternator whine problems with all of the major, more expensive brands. So except for this alternator noise, the unit works and sounds incredible, and I have a 4 years replacement warranty that was only about $45. Please tell me if there are special noise suppressors or any other solutions for the alternator whine. Thank you, Vern [/QUOTE]

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