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Replaced Head Unit on a MOST system, wow.


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My car did not have the BOSE audio upgrade, but it did have a separate amplifier. With a little bit of dremel-usage, I was able to get a 1 DIN (Blaupunkt) head unit to fit in place of the CDR23. I ripped out the stock amplifier and ran speaker wires from the new head unit to the old speaker connections. I would love to run new wires to all of the speakers, but I don't see myself ever going that far.

This particular unit supports bluetooth and iPod audio in. iPod cable runs up into the console area. The phone Microphone was run under the dash, up the A-Piller, and onto the visor. (Took this chance to pull out the antenna wire from the wire bundle, to get a little bit more range on my keyless system.)

The power running to the radio caused pretty bad alternator noise, so I had to install a power filter. Now that I did that, I'm happy with the head unit.

The next stage I will replace all of the speakers. Then I'll install a sub box (on the back deck) and trun all of the speakers through an external amplifier. Finally, I'm going to replace the head unit again with a in-dash NAV.

Fun times. Makes me wish I bought a '02.

Oh, I almost forgot. I went to reposition myself and pushed a little too hard on the glove box. I snapped the clips to the support bars, so now my box is busted. Live and Learn.

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My car did not have the BOSE audio upgrade, but it did have a separate amplifier. With a little bit of dremel-usage, I was able to get a 1 DIN (Blaupunkt) head unit to fit in place of the CDR23. I ripped out the stock amplifier and ran speaker wires from the new head unit to the old speaker connections. I would love to run new wires to all of the speakers, but I don't see myself ever going that far.

This particular unit supports bluetooth and iPod audio in. iPod cable runs up into the console area. The phone Microphone was run under the dash, up the A-Piller, and onto the visor. (Took this chance to pull out the antenna wire from the wire bundle, to get a little bit more range on my keyless system.)

The power running to the radio caused pretty bad alternator noise, so I had to install a power filter. Now that I did that, I'm happy with the head unit.

The next stage I will replace all of the speakers. Then I'll install a sub box (on the back deck) and trun all of the speakers through an external amplifier. Finally, I'm going to replace the head unit again with a in-dash NAV.

Fun times. Makes me wish I bought a '02.

Oh, I almost forgot. I went to reposition myself and pushed a little too hard on the glove box. I snapped the clips to the support bars, so now my box is busted. Live and Learn.

Good luck with the speaker upgrade, it'll be fun. I thought about doing that but I opted to just build a box and install subs to see how I felt about the sound and it worked out great for me I just run all the bass through the subs and the plastic tweeters or as Porsche calls them speakers they do good for the mids and highs. My 99C2 has the odd sub units in the doors and they kind of sound decent if the car is not running other than that they are pointless they should of just put a standard speaker there.

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I just run all the bass through the subs and the plastic tweeters or as Porsche calls them speakers they do good for the mids and highs.

Good tip. Maybe I'll just do the subs first and see how the sound goes. I'm already spending more than I wanted on an audio upgrade.

My 99C2 has the odd sub units in the doors and they kind of sound decent if the car is not running other than that they are pointless they should of just put a standard speaker there.

I still haven't decided what to do with those. They aren't hooked up now and I really don't miss them. I might buy speakers for the doors and wait until I have to take one of them apart before I swap them out. (Until I get an amp, it won't matter anyway.)

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did you replace the factory amp with anything else, or just use the head unit and the speakers with no amp?

No Amp yet. The one that came in the car is pretty worthless. Seems like the only reason it was done in the first place was to drive the door speakers. (The CDR23 can drive front/rear on its own, but isn't.)

I still haven't decided what setup I want to use. I might just get a 4-channel to drive subs and mid-range speakers in the door, leaving the head unit to drive front and rear. Or I could do two amps and keep the head unit from doing any of the amp work.

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from what i understand, there are two amps - one in the front and one in the back. i am not sure if it is the case with all of them or only with the Bose systems.

i am planning to do some work to mine, but not really sure about all the kinks that i may need to overcome.

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from what i understand, there are two amps - one in the front and one in the back. i am not sure if it is the case with all of them or only with the Bose systems.
I think there were two audio upgrades for the 911. The "performance" and "bose" upgrades. Performance added the amplifier and door subs. While the BOSE upgrade is new amplifiers and speakers.

For the non-bose upgrade, there is only one amplifier and all of the speakers are 4ohms. I would not be surprised if the BOSE upgrade had more than one amplifier because I read that the speakers in that system are 2ohms. (At first I thought all stereos had 2ohm speakers, which left me wondering what I was going to do. But it turns out all six of mine are 4.)

i am planning to do some work to mine, but not really sure about all the kinks that i may need to overcome.
This is exactly why I started with an inexpensive head unit ($200). Now I have a more featured radio and a very good idea of how my car's audio is setup. I can now plan out the rest of my system.

For what it is worth, if you aren't experienced in audio installs, this could be overwhelming. I can tell Porsche never intended for end-customers to upgrade their stereos, once they went to a MOST based system.

Oh I forgot to add in my original post... I couldn't find anything in the center dash that resembled switched power. Does anyone know if the Telephone connector (at the bottom of the console, kind of hidden) have a switched power?

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