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Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 17, 2023 6:35 am
by Pupa.aqua
Hi,

I bought a 2003 e85 3.0i z4. It contains only six speakers with business CD. The sound seems to be not good enough. I want to upgrade aftermarket amplifier and speaker by myself. However, I cannot find amplifier location. Does anyone know where it is?
Thank you.

Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 17, 2023 9:21 am
by pvr
The oem amp is next to the battery.

Note that with the 6 speaker system you don’t have an amp.

Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 17, 2023 10:49 am
by Zedebee
The head unit is the amp in a 6 speaker set up. It is possible to add speakers into the door blanks, which should be prewired in a 2003 and the speakers are the same as the ones behind the headrest. Upgrading to the standard 10 speaker “hi-fi” is possible but requires finding a power amp for the boot and bass speakers for behind the seats. I am not sure if the wiring loom is pre installed though, but they do come up for sale from time to time. Upgrading to the “top hi-fi” DSP system seems to be virtually impossible.

There are plenty of threads on here dealing with aftermarket upgrades if you don’t want to stick with OEM.

Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 17, 2023 11:03 am
by pvr
Yes, I did not make that clear they you don’t have an additional amp on the 6 speaker system and only the head unit itself.

Where is 2003 e85 z4 audio amplify location?

Posted: Mon Dec 18, 2023 5:29 pm
by Pupa.aqua
That means the power by business CD to speaker without amp is low. That’s why audio quality is bad🥲. If I locate oem amp near business CD. Could I jump business CD audio output as oem amp input and output from amp to original 6 speaker?

Where is 2003 e85 z4 audio amplify location?

Posted: Mon Dec 18, 2023 8:35 pm
by Zedebee
I don’t see why not, although you will need to find a power supply for the amp. It isn’t going to work with the DSP amp, so make sure you get the non-DSP hi-fi amp and the (behind the seats) sub-woofers too.

Where is 2003 e85 z4 audio amplify location?

Posted: Fri Dec 22, 2023 10:53 am
by Pupa.aqua
I found the mux figure as below. The speaker connection seems only for 4 i.e. FR/FL/RR/RL.
1. Which one is the front 6” speaker pin connection?
2.If I want to add door 4” speaker, which pin I can connect? Is parallel circuit ok?
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Where is 2003 e85 z4 audio amplify location?

Posted: Fri Dec 22, 2023 11:44 am
by Zedebee
In parallel with the tweeter. In an early car, the wiring should already be in place.

Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 24, 2023 10:12 am
by Pupa.aqua
Got it.
Which pin is rca signal out? If I want to connect to amplify. It’s need. I cannot find any pin seems to be like.
Thank you.

Where is 2003 e85 z4 audio amplify location?

Posted: Sun Dec 24, 2023 3:28 pm
by Zedebee
I’m not an expert on car hifi, but I had a look at the pin assignments for the 10-speaker hi-fi amp. There are 20 outputs (2 each for 10 speakers) but only 8 inputs from the radio (the 8 speaker outputs that you have identified). There is no separate RCA connection.
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Where is 2003 e85 z4 audio amplify location?

Posted: Mon Dec 25, 2023 9:49 am
by Pupa.aqua
Hi,

This version is more clear. Since my system is 6 speaker version. Where is the link of this figure? I want to find 6 speaker pin out figure.
Many thanks.

Where is 2003 e85 z4 audio amplify location?

Posted: Mon Dec 25, 2023 12:04 pm
by Zedebee
Here is the pin out for the Radio. Pin out is the same for 6-speaker, 10-speaker and DSP.
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