30

Stereo

By
booneylander
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This is the Sony CDX-GT550UI I will be installing.

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Frustrated by the fact that I would have to go to the Audi dealer and pay them money to have them hook up diagnostic tools to my car to retrieve my stereo code (good one!), I decided the stock system could lick my bean bag, so I swapped in a Sony CDX-GT550UI. This stereo has been great in all the car's I've installed it (4 or 5 of them so far), seriously, when this head unit goes on sale I buy them 3 at a time. Anywho, most importantly, it has USB / AUX inputs on top of the usual CD/AM/FM options, and the USB interface is mint, I can plug my smart phone into it and listen to the music stored on the phone while at the same time charging, or I can just drop a USB loaded with music into it, and even throw an MP3 CD loaded to the gills and have some aural entertainment. I should also mention that this head unit's sound is incredible, it has some DM settings (dynamic something or other) and XPLOD sound settings that make even your crappy stock speakers sound just incredible, and all for under 100$.

I hesitated at first because the stock head unit is larger than DIN. I found out once I pulled the stock head unit out that the mounting was standard DIN which makes my life a lot easier, however the face plate was quite a bit wider, so I would end up with a gap.

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Connections

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I cut and spliced in all the connections that were required. Fortunately a print of all the pins is on the stock Audi head unit so getting things lined up was simple enough when double checked with a multimeter. The only trouble was for the rear speakers, which from stock only receive a low voltage signal from the head unit, that signal is fed into an amplifier in the left rear speaker housing and is bumped up then to high voltage speaker output. More on that after the jump. Here you can see all connections were soldered and covered with heat shrink tubing for a clean permanent install.

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Here is the connector that would normally run to the amplifier.

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Here is the stock amplifier circuit.

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Here you can see the connector that would go into the stock amplifier, where I cut and soldered the left speaker leads directly to the speaker posts, and also how I bypassed the amplifier and connected the right speaker leads directly to the wires that had been running from the amp to the right speaker.

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Negative. This stereo was very seldom installed into A4s, so no aftermarket support sadface. - booneylander July 19th 2012
Looks good, but isn't there any filler piece that can be located on ebay or something??? - ripcurl July 16th 2012

And here is the end result, which sounds amazing, but I really do need to come up with a plate to hide the gap. I'm thinking what I might do however is mount a tinted plastic plate over the whole thing so it just looks like a black panel when off, but when on the stereo would shine through. Then I can control everything with the remote and maybe have the panel flip up to add a CD when needed. I guess said panel would also have to have a slit for the USB.

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