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high freq hum ?

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9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHhigh freq hum ?

Reported repair

Install amp, two filters

Reported resolution
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

i had this same hum from my newly installed amp, two filters on the input solved the problem completely..

Original post Read captured discussion
high freq hum ?
Read full discussion summary

Leading evidence: 'Install amp, two filters' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'alternator noise induced into electrical system' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install amp, two filters' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Install amp, two filters', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 9 captured posts examined · 0 partial discussions

Compare 2 other evidence results

alternator noise induced into electrical system

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that report identifying a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause · Original poster

I assume that this is caused by alternator noise induced into electrical system.

Original post Read captured discussion
high freq hum ?

earth loop

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that suspect a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause

Probably an earth loop...

Original post Read captured discussion
high freq hum ?
Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Install amp, two filters

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

i had this same hum from my newly installed amp, two filters on the input solved the problem completely..

Original post Read captured discussion
high freq hum ?
Reported and suspected causes (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

alternator noise induced into electrical system

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause · Original poster

I assume that this is caused by alternator noise induced into electrical system.

Original post Read captured discussion
high freq hum ?

earth loop

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause

Probably an earth loop...

Original post Read captured discussion
high freq hum ?
Actions with reported resolution accounts (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Install amp, two filters

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

i had this same hum from my newly installed amp, two filters on the input solved the problem completely..

Original post Read captured discussion
high freq hum ?
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link

Still getting the hum sometimes with the isolator - will probably try the power-side filter.

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

Generation: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I've hooked an iPOD to the AUX input of the CDR-220 head unit. Works fine. I bought the iPOD car charger (made by Belkin) and during quiet passages there is a hum (only there when the charger is connected). I can minimize it by turning the iPOD volume out to max, allowing the CDR-220 to be a lower level (typically volume ranges from +15 to +25 depending on my mood). I assume that this is caused by alternator noise induced into electrical system. Does anyone know anyway to filter it out? Anyone else have this problem? Thanks!

POST 3Original post

I have this same problem - have taken to bypassing the belkin unit until I find a solution. Any ideas greatly appreciated.

POST 4Original post

Only thing I can think of is a line conditioner, but I don't know if they make one small enough for this application

POST 5Original post

i had this same hum from my newly installed amp, two filters on the input solved the problem completely.. waz

POST 6Original post

Radio shack sells a ground loop isolator for less than $20. I just installed it and it seems to work. We'll see if it does tomorrow. Ed

POST 7 / ORIGINAL POSTEROriginal post

I saw the link in the other thread to the Radio Shack ground loop isolator. Thanks. Is there a product that filters the power side, rather than the signal side. Intuitively, it seems better to filter the noise before it gets into the music. Thoughts?

POST 8Original post

I think so. Radio shack had a larger unit that had power-lead looking wires on it for CBs, Ham Radio etc. It was also about $20. Same section.

POST 9Original post

Still getting the hum sometimes with the isolator - will probably try the power-side filter.

This is a source reference. Confirm exact model applicability in the original material.