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<blockquote data-quote="Vern Dee" data-source="post: 7886162" data-attributes="member: 644991">Which Ground Loop Isolator specifically are you talking about...What brand or model number?I bought a Power Acoustik PD-931NB on Amazon, along with the 4 year warranty. I installed it in my BMW 740i and it works great. The touch screen is just like an iPad, and the DVD/MP3/CD player plays better than the BMW original unit.Out of the box the speaker level outs, are 17W RMS X 4, so for just the head unit power, it sounds good.There was no alternator noise with the speaker level outputs... but...Here&#039;s my only problem, that I am asking for your help on, from anyone out there that has had this problem: I hooked up an Alpine amp via the RCA Preamp outs... and I have high pitched alternator noise. When I mute the head unit, or disconnect the RCAs, it stops. So its coming from the head unit, not the Amp. I have tried grounding the head unit to the same point as the Amp, and an Exterminator inline noise suppressor. PLEASE...can anybody help me get rid of the Alternator Whine ???Which Ground Loop Isolator specifically are you talking about...What brand or model number?&nbsp;&nbsp; Thanks, Vern</blockquote>

[QUOTE="Vern Dee, post: 7886162, member: 644991"] Which Ground Loop Isolator specifically are you talking about...What brand or model number? I bought a Power Acoustik PD-931NB on Amazon, along with the 4 year warranty. I installed it in my BMW 740i and it works great. The touch screen is just like an iPad, and the DVD/MP3/CD player plays better than the BMW original unit. Out of the box the speaker level outs, are 17W RMS X 4, so for just the head unit power, it sounds good. There was no alternator noise with the speaker level outputs... but... Here's my only problem, that I am asking for your help on, from anyone out there that has had this problem: I hooked up an Alpine amp via the RCA Preamp outs... and I have high pitched alternator noise. When I mute the head unit, or disconnect the RCAs, it stops. So its coming from the head unit, not the Amp. I have tried grounding the head unit to the same point as the Amp, and an Exterminator inline noise suppressor. PLEASE...can anybody help me get rid of the Alternator Whine ??? Which Ground Loop Isolator specifically are you talking about...What brand or model number? Thanks, Vern [/QUOTE]

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