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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSony Headunit MEX-GS820BT Upgrade
Leading reported evidence
Run 3 channels - 1 front channel
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
Sony make these headunits with this in mind, so now I run 3 channels - 1 front channel for FL / RL speakers in series (8ohms total), 1 front channel for FR / RR in series (8 ohms total), 1 rear channel for both subwoofers in series (4 ohms total).
Leading evidence: 'Run 3 channels - 1 front channel' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean punch' (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.
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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
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Suggestion · Original poster
Sounds really good to my ears, surprisingly so actually and decent clean punch from the door speakers.
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.
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Suggestion · Original poster
Not good to run different impedance / frequency speakers on same channel from what I can gather.
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
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Suggestion · Original poster
From all I read on the internet this would likely sound rubbish, however what was clear to me even as someone who had absolutely no experience on car ICE installs was that certainly a few people seem to be running the door subwoofers as standard speakers, in line with dash or rears.
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
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Suggestion · Original poster
What I decided to do in an attempt to upgrade ancient kit and simplify things, was remove CD changer and boot mounted amplifier, and install new Sony MEX-GS820BT headunit with built in 4x100w amplifier, running OEM speakers.
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
Sony make these headunits with this in mind, so now I run 3 channels - 1 front channel for FL / RL speakers in series (8ohms total), 1 front channel for FR / RR in series (8 ohms total), 1 rear channel for both subwoofers in series (4 ohms total).
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
From all I read on the internet this would likely sound rubbish, however what was clear to me even as someone who had absolutely no experience on car ICE installs was that certainly a few people seem to be running the door subwoofers as standard speakers, in line with dash or rears.
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
What I decided to do in an attempt to upgrade ancient kit and simplify things, was remove CD changer and boot mounted amplifier, and install new Sony MEX-GS820BT headunit with built in 4x100w amplifier, running OEM speakers.
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.
Unsuccessful attempt · Original poster
The car has the usual Nokia connectors for amplifier and I did a bit of digging and found out that not only Porsche used these on 993 / 996, but BMW as well. I bought a cheap Boxster 4 channel amplifier first to try and rob the connector I needed but it did not work (the connector is hard mounted to amplifier PCB).
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.
1 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T070717Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi,
I don't post often but use the site a lot as a resource. Hopefully the below can help someone. I have upgraded / simplified the OEM sound system in my 996 with a Sony headunit, without messing with the cars existing wiring loom.
My car came with factory 6 speaker upgrade (option 490?), 2 dash speakers, 2 rear speakers, 2 door subwoofers, 6x40W amplifier. When I purchased the car the factory headunit had been swapped out for Alpine unit and didn't sound great. I'm not even sure it was wired properly.
What I decided to do in an attempt to upgrade ancient kit and simplify things, was remove CD changer and boot mounted amplifier, and install new Sony MEX-GS820BT headunit with built in 4x100w amplifier, running OEM speakers.
From all I read on the internet this would likely sound rubbish, however what was clear to me even as someone who had absolutely no experience on car ICE installs was that certainly a few people seem to be running the door subwoofers as standard speakers, in line with dash or rears. Not good to run different impedance / frequency speakers on same channel from what I can gather.
Front Nokia speakers and rear are impedance 4ohms each. Door subwoofers are 2ohms each.
The car has the usual Nokia connectors for amplifier and I did a bit of digging and found out that not only Porsche used these on 993 / 996, but BMW as well. I bought a cheap Boxster 4 channel amplifier first to try and rob the connector I needed but it did not work (the connector is hard mounted to amplifier PCB). What it did teach me is the connectors were the same, and only differ by location of plastic tabs on them (they are keyed basically).
I did not want to cut the factory wiring loom so bought a Connects2 CT10BM04 wiring loom which looking at photos was only thing that had the Nokia connector I needed with wires in the back. I cut this loom in half, stuck the Nokia connector in the front boot. Halfords premium speaker wire was run the same route as the amplifier / CD cabling, through the bulkhead of the car behind the battery. Headunit is now wired direct to car speakers.
How did I turn 6 channels into a 4 channel system? Sony make these headunits with this in mind, so now I run 3 channels - 1 front channel for FL / RL speakers in series (8ohms total), 1 front channel for FR / RR in series (8 ohms total), 1 rear channel for both subwoofers in series (4 ohms total). Car wiring is unaltered and all bridging of speakers done at the Nokia connector wiring, hidden out of sight behind carpet when I get a chance to tidy up.
Once powered up I made sure to set the door subwoofers as subwoofers and tweaked the frequency cut offs by just playing around. Sounds really good to my ears, surprisingly so actually and decent clean punch from the door speakers. I've got Harman Kardon OEM system in one of my other cars and this does not sound bad at all. Headunit matches interior too (can customise colours) and dims when car lights switched on etc.
Would be a good upgrade for people with the basic dash / rear speaker sound system also - easy to add subwoofer etc. Only downside is no DAB. Sony actually do another model, the DSX-GS80 with no CD.
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