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Intermittent Sub Hummmmmmmmmmmmmmmmm
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<blockquote data-quote="wiltim2024" data-source="post: 8869025" data-attributes="member: 690738"><p>Ok...Im sure this question has been asked a million times....</p><p></p><p>Im installing a JBL BassPro in my 2021 Travers because my wife seems to think she needs it. So the adventure starts.</p><p></p><p>Side note...one thing I found weird was that when checking voltage signal on speaker wires I was showing voltage on both positive and negative wires WITH the wires disconnected from the door speakers. I was expecting to have the positive show voltage and the negative show nothing...anyway.</p><p></p><p>So I originally had the Sub wired to the battery for the power and ground. I started by using the high-level inputs from the rear door speakers. The head unit doe not have RCA pre-outs. I was getting an occasional hum. It would come and go when accelerating. It does NOT do this when the car is running and just sitting. So first step is to relocate the ground. I moved to ground to the body and is about 3 feet from the sub. Still does the same thing.</p><p></p><p>Next, I read that it could be an issue with the high-level inputs (and with the detection of voltage on both + and - of speaker wires which I found weird) so installed a line converter to convert the signals to RCA. I used a Crux SOOCR-26 Wiring Interface. Still getting the same sound.</p><p></p><p>Im pretty sure the sub is good. I moved it from my Jeep which it was working fine there. Only difference is that HU has pre-outs. But I don;t think its speaker noise because even if the radio is off the noise still happens. </p><p></p><p>Any advice would be appreciated...preferably troubleshooting before throwing more $$ at parts! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="wiltim2024, post: 8869025, member: 690738"] Ok...Im sure this question has been asked a million times.... Im installing a JBL BassPro in my 2021 Travers because my wife seems to think she needs it. So the adventure starts. Side note...one thing I found weird was that when checking voltage signal on speaker wires I was showing voltage on both positive and negative wires WITH the wires disconnected from the door speakers. I was expecting to have the positive show voltage and the negative show nothing...anyway. So I originally had the Sub wired to the battery for the power and ground. I started by using the high-level inputs from the rear door speakers. The head unit doe not have RCA pre-outs. I was getting an occasional hum. It would come and go when accelerating. It does NOT do this when the car is running and just sitting. So first step is to relocate the ground. I moved to ground to the body and is about 3 feet from the sub. Still does the same thing. Next, I read that it could be an issue with the high-level inputs (and with the detection of voltage on both + and - of speaker wires which I found weird) so installed a line converter to convert the signals to RCA. I used a Crux SOOCR-26 Wiring Interface. Still getting the same sound. Im pretty sure the sub is good. I moved it from my Jeep which it was working fine there. Only difference is that HU has pre-outs. But I don;t think its speaker noise because even if the radio is off the noise still happens. Any advice would be appreciated...preferably troubleshooting before throwing more $$ at parts! :) [/QUOTE]
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