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2003 C4S amplifier bypass question

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

Discussion summary

YOUR RESEARCH2003 C4S amplifier bypass question

Leading reported evidence

Replace 4 of my speakers

Performed · outcome unconfirmed

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 performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

I have the base base system with no door speakers, and I replaced all 4 of my speakers with the Hertz units from CAI.

2003 C4S amplifier bypass question
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Leading evidence: 'Replace 4 of my speakers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 4 of my speakers' (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 · 4 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Replace speakers

Performed · outcome unconfirmed

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 performed work without a confirmed outcome
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.

Performed · outcome unconfirmed · Original poster

PO appears to have replaced all the speakers already.

2003 C4S amplifier bypass question

Replace amp, just bypass it

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 · Original poster

I don�t plan to replace the amp, just bypass it.

2003 C4S amplifier bypass question
Frequently discussed actions (3)

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

Replace 4 of my speakers

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed

I have the base base system with no door speakers, and I replaced all 4 of my speakers with the Hertz units from CAI.

2003 C4S amplifier bypass question

Replace amp, just bypass it

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 · Original poster

I don�t plan to replace the amp, just bypass it.

2003 C4S amplifier bypass question

Replace speakers

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed · Original poster

PO appears to have replaced all the speakers already.

2003 C4S amplifier bypass question
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.

4 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.

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

Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Howdy everyone. I�m sure it�s been covered ad nauseum but I can�t find it. I�m trying to do a stereo replacement in my 2003 C4S (hiFi, not Bose) and I understand I need to bypass the factory amplifier. I don�t plan to replace the amp, just bypass it. Is this feasible? If so, how do I actually do it? If not, I guess I�ll buy an amp and follow instructions I�ve seen elsewhere but I don�t really feel like I need an amp. PO appears to have replaced all the speakers already. I sent my factory head unit to Becker Autosound for the Bluetooth mod, but it sounds like generally poor FM radio reception. (Because it is.) I picked up a Sony unit and am looking for the most straightforward way to bypass my amp and wire this up. Links appreciated. Unit waiting for installation

POST 2Original post

That�s the same head unit I got. I have the base base system with no door speakers, and I replaced all 4 of my speakers with the Hertz units from CAI. The sound is very good, although bass response is unsurprisingly poor (not distorted or weird, just weak). Your car does have the door speakers though and you would also want to drive them unless you are also going to get a subwoofer. (I am installing a small powered sub soon, myself). To bulypass your amp would be a bit of a pain as you would have to find the speaker wires coming out of the amp and (a) extend them to link up with the head unit and (b) figure out how to distribute the 4 channels coming out of the head unit to 6 speakers. I�d say just get the appropriate harness to connect to your amp and be done with it. CAI can supply all the necessary components and also give you great 1:1 service. https://cai-store.com/collections/99...-of-911s-99-04

POST 3 / ORIGINAL POSTEROriginal post

Thanks, @Boff So you think I should keep the factory amplifier? I thought it was a problem since the new(-er) speakers are 4-OHM units and the factory is a 2-OHM setup. (Disclosure: I may be the most uninformed stereo guy in North America. Just saying it's possible.)

POST 4Original post

The speakers will get less power but maybe they are more sensitive (and they�d surely be better quality). Might be a saw-off, in practical terms.

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