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Vibrations from subwoofer installation

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

Discussion summary

YOUR RESEARCHVibrations from subwoofer installation

Leading reported evidence

Test drive their cars

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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 contain suggestions
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.

Suggestion

I like what Rolls Royce used to do - test drive their cars with a little guy in the trunk with a mallet & fastners.

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Vibrations from subwoofer installation
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Leading evidence: 'Test drive their cars' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test drive their cars' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. 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 · 3 captured posts examined · 0 partial discussions

Compare 1 other evidence results

Tighten specific fixtures, etc

Suggestion or failed attempt

No successful repair reported for this finding.

0
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 contain suggestions
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.

Suggestion

Sometimes this is dynamat (or similar), sometimes sealing foam, tightening specific fixtures, etc.

Original post Read captured discussion
Vibrations from subwoofer installation
Frequently discussed actions (2)

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

Test drive their cars

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.

Suggestion

I like what Rolls Royce used to do - test drive their cars with a little guy in the trunk with a mallet & fastners.

Original post Read captured discussion
Vibrations from subwoofer installation

Tighten specific fixtures, etc

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.

Suggestion

Sometimes this is dynamat (or similar), sometimes sealing foam, tightening specific fixtures, etc.

Original post Read captured discussion
Vibrations from subwoofer installation
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.

3 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

I had some problems with the box itself rattling, I fixed it by placing a couple of rolled washcloths along the sides to make for a tighter fit.

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I spent 10 hours on Sunday constructing a sealed custom enclosure that houses 2 JL Audio 8 inch subwoofers in the space between my rear seats and rear deck. They sound amazing but parts of the car are rattling at high volumes, especially the rear exterior quarter panels between the doors and rear wheelwells. Has anybody else tried something like this? Is there any other option out there besides dynamating? Thanks in advance, John. <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

POST 2Original post

You can track down each & every resonance mode and "fix it". Sometimes this is dynamat (or similar), sometimes sealing foam, tightening specific fixtures, etc. etc. It takes patience & help, & can be very frustrating (fixing one source chases the energy to another mode-site). In the so-called high end audio biz, competition cars can be so laden (leaden?) w/ damping material (inc. concrete) that they were 1000 - 2000 lbs above "curb weight" and completely undriveable ("for listening purposes only"). I like what Rolls Royce used to do - test drive their cars with a little guy in the trunk with a mallet & fastners. Those were the days.

POST 3Original post

Sounds similar to the box that I had built for my 996 (minus the rattles). I had some problems with the box itself rattling, I fixed it by placing a couple of rolled washcloths along the sides to make for a tighter fit. Other than that the system is remarkably rattle free, even at higher volumes. Not bad for a 99 model!! Perhaps tune the bass down a bit. <img src="graemlins/c.gif" border="0" alt="[ouch]" />

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