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E85 / E86 Z4 (2003-2008)
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  #1  
Old 06-03-2019, 02:08 PM
rmjames007 rmjames007 is offline
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Aftermarket Radio / Receiver

So I am looking again at the audio in the Z4 and I want to make a change and put in something else

I was always under the impression that you can not just change out the head unit. IF you did you would have to change out the Amp and the speakers.

Now I am talking to Crutchfield and they are saying I can change out the head unit but I would just need to splice in after the factory amp.

I wanted to find out other peoples experience.
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Old 06-10-2019, 10:23 AM
rmjames007 rmjames007 is offline
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Old 06-12-2019, 08:46 AM
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Clearancediver Clearancediver is offline
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There are lots of threads/posts on this subject.

A little time spent googling this will give you the details......

Hint: Run the last 7 digits through a vin decoder to see what radio system you have. There are 3...


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Old 06-12-2019, 09:21 AM
rmjames007 rmjames007 is offline
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I have the Hifi+ system i did look that up with my VIN
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Old 06-12-2019, 09:50 PM
Andyz4 Andyz4 is offline
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The Crutchfield advice is good. My understanding is that the oem speaker impedance and amp are matched, making aftermarket upgrades a bit limited. If you end up keeping the factory head unit, I highly recommend the Grom unit which will let you stream music and retain steering wheel controls.
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Old 06-13-2019, 11:06 AM
rmjames007 rmjames007 is offline
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I used the audiovox / soundcity Dice unit
This is a great solution that adds BT, Handsfree, AUX, Usb Satellite to your factory unit/. It works great.

I got a quote from best buy. Its about 1.2k to do the work. reasonable. the head unit is about $500. I am wanting a Pioneer Single din NEX unit. They also have spec-ed an alpine KTP-445U. its a 180w small amp. So it looks like the Nex will plug into the back of it and then it will be in the bypass of the factory amp.

I think i am gonna pull the trigger and do it. still just pulling it all over
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Old 06-24-2019, 10:51 AM
Stinger22 Stinger22 is offline
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2006, 3.0si E85. I had the Top End Hi-Fi ten speaker and my amp required a digital signal from the OEM HU to turn on the amp, not just the normal pre-amp power hitting the amp. Had to replace the OEM amp and they had to run all new wires. 4 signals came from the new head unit, Alpine, and six from the new amp also Alpine. Kept the OEM speakers they are not bad speakers at all.

Last edited by Stinger22; 06-24-2019 at 10:53 AM.
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Old 06-27-2019, 03:50 AM
rmjames007 rmjames007 is offline
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How were you able to keep the OEM speakers, since they are not the same OHMs as 3rd party /aftermarket speakers?
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Old 06-27-2019, 01:53 PM
Stinger22 Stinger22 is offline
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Originally Posted by rmjames007 View Post
How were you able to keep the OEM speakers, since they are not the same OHMs as 3rd party /aftermarket speakers?
I didn't run the wires myself the shop did but I don't think they had to bridge anything.
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