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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > 2008 Bmw328xi front speakers replaced



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      06-29-2023, 02:24 AM   #1
Andyworks
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2008 Bmw328xi front speakers replaced

I replaced the stock front door speakers. The new speakers are 4ohm speakers. Everything has worked fine for a week, and now the main audio fuse #14 in the glove box is blown. I put a new fuse in and it instantly sparked and blew, as if there was a fault to ground. My question is, can the built in amp handle 4 ohm speakers or is it strictly 2ohm. I also have an independent 10” amp in the trunk, but it has never been an issue. The only thing changed is the 2 front speakers. I think my son had the volume to high, would this cause a fuse to blow? Kindly Andy
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      06-29-2023, 02:47 AM   #2
ctuna
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Which amp are you talking about there are three systems
One has only head unit power. The other two have amps of different
sizes and power.

BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attach...2&d=1266451970
http://www.e90post.com/forums/attach...2&d=1260829447
http://www.e90post.com/forums/attach...1&d=1209780865
http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/
http://technicpnp.com/menuDiagrams/d...e90_92_93.html
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...3&d=1169133185
http://www.e90post.com/forums/attach...1&d=1209780605
http://www.e90post.com/forums/showthread.php?t=641323
http://www.e90post.com/forums/attach...4&d=1278871872
http://www.e90post.com/forums/showthread.php?t=343673
https://www.bimmerfest.com/threads/e...n-752.1275694/

base system wiring pre/post 3/09
https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_
Base System Guide
http://www.e90post.com/forums/attach...5&d=1493273253
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      06-29-2023, 12:29 PM   #3
Andyworks
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Txs for all the links of great info. I will have to investigate which system the car has. I think it may just be HiFi system. I will follow up. 😀
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      06-29-2023, 01:10 PM   #4
Peter Morrin
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Typically, a higher resistance speaker will draw less power from the amp. That being said, speaker resistance ratings are nominal and vary with frequency. Given your symptoms, however, I would see if you speaker leads have shorted against each other. This would yield zero resistance and maximum current from the amplifier.
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      06-29-2023, 01:15 PM   #5
Andyworks
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Txs again, in my opinion something has to be wrong with the wiring. The new speakers worked perfectly fine for over a week and then suddenly this. I will take off the door panels and investigate.
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      06-29-2023, 03:05 PM   #6
ctuna
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If you have the base system that has no amp the underseat speakers are wired in
parallel with front doors.
Usually you would just see a reduction of volume with higher impedance speakers.

One of the easier way to find out what you have or what the car came with is
Mdecoder.com 676 = hi fi 677 or 688 = Logic 7 aka Top Hi Fi
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      07-01-2023, 10:12 PM   #7
Andyworks
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So, I spent multiple hours trying to diagnose this issue. The only thing replaced was the two front speakers in the front doors which worked fine for 2 weeks. I disconnected them and it is still blowing the fuse in glovebox. I disconnected the amp harness in the back of the trunk from the stock amp. Still blowing the fuse. I removed the built in car stock radio, and still blowing the fuse #14. I will have to track down the wiring diagram of everything that is connected to the fuse as I am out of ideas. It’s that or it has to go to an auto electrician to solve.
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      07-01-2023, 10:33 PM   #8
ctuna
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This attachment has a lot of BMW info.
Attached Images
File Type: pdf E9x References, 220216 Revision-2-1-1-1.pdf (240.0 KB, 60 views)
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