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Old 10-05-2021, 03:20 PM   #1
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Default Exterior Speakers Buzzing?

We own a 2018 Winnebago ERA. It has the typical Jensen sound system which includes two exterior speakers. Recently they played very softly and have a buzzing sound making them inaudible. I ordered direct factory OEM replacements. Installed and theyíre producing the same sound. Connections at the speakers are tight. So Iím wondering if something may be loose at the back of the Jensen unit. It seems locked in somehow so I need to figure out how to pull it out of the cabinet. Suggestions to release it? Any other suggestions as to the poor sound?

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Old 10-05-2021, 04:13 PM   #2
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Seems like a short in the speaker wire somewhere. I think Jensen audio components are secured in place by four screws, two on either side that may be hidden by a bezel.

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Old 10-05-2021, 04:19 PM   #3
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Is this a problem that developed over time, or did it always do it?
Speaker hum in vehicles is very often caused by ground loop issues, in which there are multiple return paths to ground. This is often caused by using shielded audio wire and grounding the shield on both ends, which should never be done. There is a lot of nonsense about grounding practices floating around the Net, and I doubt that upfitters are immune.

One easy way to address ground loop issues is to get an isolation transformer, such as this:
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Old 10-05-2021, 04:47 PM   #4
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It will not be the "speakers" or the "speaker wires"

that's wasted effort and money

a power amplifier runs full out, amplifying any sound it gets at the input whether it is music or a hum or buzz such as from a ground loop

a filter as above might just be your fix

a low hum, almost always indicates a 60 cycle AC ground loop, and high pitched buzz can be a lack of ground or shielding problem

less likely is an internal fault in the amplifier

- this is tested by unplugging the input to the amplifier - if the noise goes away, it is in the lines connecting to the input.

if the noise persists it is in the power supplied to the amp ( super rare on battery power, no shore power, motor off) or an internal fault in the amp

or interference from a nearby device, something with a big transformer, such as an inverter

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Old 10-10-2021, 04:15 PM   #5
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I've had similar issues with 12 volt amps. I resolved the issue by keeping the volume on the amp as low as possible and instead keeping the volume high on the input device, in my case an iPod wired through the earphone jack as well a running the tv headphone jack through the amp.
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Old 10-10-2021, 04:29 PM   #6
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We never have used the outside speakers in our 2017 Era 70A. We don't want to annoy our camping neighbors with the noise as we get annoyed when others are blasting music nearby. However we never have noticed the hum or buzz you are referring to. AND we are so disappointed with the Jensen piece of junk installed in our unit. It was obsolete when it was installed as the Bluetooth and usb connection only works on an iphone 5 and lower. So we only use the unit for DVD playing. I specifically called Winnebago to complain on the issue and their response was to shrug so what? Also called Jensen and they admitted it is an older unit in our RV and wanted $450 for an undated model. Forget that! Not worth it.
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Old 10-12-2021, 04:25 PM   #7
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When you get distortion through the speaker there are 2 possible sources: the speaker ( they lead a hard life in exterior mounts), or the amplifier is faulty. Both speakers are probably driven by a a single 2 channel integrated power amp module. These blow out for a variety of reasons: playing too loud, voltage spikes from the 12 volt supply, shorting out or grounding one or both speaker leads. Since you have replaced the speakers with new ones it points to the amplifier. You will have to remove the unit to get it checked out.
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Old 10-12-2021, 05:35 PM   #8
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I subsequently noticed the subwoofer, located inside the coach, is buzzing as well. I communicated with Jensen (ASA Electronics) and they quickly asked me to return the unit for diagnostic tests. Itís on the way so Iíll see.

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