5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHReplacing PCM - aftermarket headunit-Very noisy+weird noises
Reported or suspected cause
bose amp and or speakers
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.
Leading evidence: 'bose amp and or speakers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'bose amp and or speakers' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Clean no problems at all' (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.
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 · Original poster
I've wired the HU into my stereo to eliminate that, it was nice and clean, no problems at all.
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 · Original poster
I'm not after concert hall, super-fi, the 996 is way too noisy for that, just something simple, nice and clean with BT music streaming and BT phone.
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 · Original poster
Changing the earthing point didn't make any difference.
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.
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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
However I don't recall reading how people have solved the issue.
I know there are plenty of threads on this subject already.
I have a 2002 996 which has factory Bose and original navigation, PCM with a telephone handset. (non-MOST)
I asked the garage to replace it with an Alpine ILX700. They did a bit of a hatchet job, wired the speaker out into the Bose and didn't connect any power to the aerial amp, so radio reception was pretty bad.
I ended up stripping it all out and working out how to wire in the preouts etc. Did all that and got it working ish. Problem is that it sounds awful. There is lots of interference type noises which is very noticeable. I've wired the HU into my stereo to eliminate that, it was nice and clean, no problems at all.
So it's likely to be incompatibility between the HU and the Bose system. Perhaps ground loops.
However I don't recall reading how people have solved the issue.
What did you guys do?
Live with it?
Put the original back in?
Ripped out the Bose?
I'm not after concert hall, super-fi, the 996 is way too noisy for that, just something simple, nice and clean with BT music streaming and BT phone.
I may even go single DIN, like the Continental unit for 1990s looking simplicity.
What seemed to be good for mine was to ground the head unit to its own location on the chassis, rather than sharing an earth with the dash.
Night and day difference to reception.
Update
Changing the earthing point didn't make any difference.
Still got the noises, like an old GSM phone communicating with the base station.
Solution, rather drastic, but I sold the Alpine and bought a more modern JVC KW-M745DBT with DAB+, CarPlay and Autoplay for not many notes, £270 for a refurbished unit.
No more funny noises. The only down side is that I can't change the start up screen, minor annoyance.
The sound quality is still a bit MEH. It isn't the HU, it's the rest of the system. I suspect the Bose amp and or speakers. Since I have a few amps not doing anything, I'll see if the amp makes a significant improvement.
I find the SQ is a little muffled and the mid-bass is boomy and single note.
I've read that the Bose sub is two 2ohm 5" speaker wired in parallel in a ported cabinet.
- Is it worth rewiring and changing the speakers?
- Anyone fitted 6.5/8" subs?
Just to add, I'm not after decent SQ, the 996 is way too noisy for that.
This is a source reference. Confirm exact model applicability in the original material.
