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YOUR RESEARCHQuestion for the audio experts
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Use pre-amp signal
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I ended up using the pre-amp signal from the Blaupunkt Brisbane SD48, bypassing its internal amplifier.
Leading evidence: 'Use pre-amp signal' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use pre-amp signal' (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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I have a 1999 Carrera 4 with Hi-Fi option and the DSP option. Unfortunately, this is paired with the cassette stereo and 6 disc changer. I don't really want to chop up the wiring, but I would like some of the features of a newer head unit.
It just so happens I also have a new in the box Blaupunkt Brisbane SD48 head unit. (Bought for another project; has yet to actually make it into the car...) The connectors on the back of the Blaupunkt appear to be the same as those on the back of the factory Becker radio.
Could it be as simple as pulling out the factory Becker and installing the Blaupunkt? Or will the amplifier section of the Blaupunkt wreak havoc on the rest of the system?
I knew I should have put IMS in the title...
So, for future searchers out there, I shall answer my own question.
I ended up using the pre-amp signal from the Blaupunkt Brisbane SD48, bypassing its internal amplifier. Everything plugs in without having to cut a single wire. Even the antenna connection on the Blaupunkt radio matches what came from Porsche. To my ears, the sound is much clearer and stronger. The radio reception appears to be better as well.
The yellow pre-amp plug found in the car is exactly the same as the pre-amp harness that comes with the Blaupunkt. All of the speakers work and the DSP unit works.
The black lower plug with power connections is exactly the same physically, but there are two discrepancies between Porsche wiring and Blaupunkt radio. One pin that is unused in the Porsche wiring is "Telephone Mute" on the Blaupunkt radio. Another pin that is "Telephone Mute" in the Porsche wiring is labeled "Subwoofer" on the Blaupunkt radio. Since I am not using either a telephone mute signal or a subwoofer signal at this time, I just left them alone.
Well I
did
have some pics on my iPhone, but their latest software upgrade wiped them out. I'll have to go get some pics with my digital camera and post them (the car isn't here at the moment). Probably tomorrow...
