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Bavarian Soundwerks' Mobile Electronics Forum
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Old 09-08-2013, 02:33 PM   #1
chiefandy
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Join Date: Sep 2012
Location: Bowie, MD
Posts: 7
My Ride: 2000 323i
Muffled Audio from Speakers

Car: 2000 323i
Stereo: all stock, non-HK
Amp part number: 8368230

Two of my speakers (6.25" ones in the doors) sound as if they're blown (most noticeable when listening to talk radio) while in the car, but they looked fine upon visual inspection and tested fine when I wired them into my home TV. I pulled out the amp and opened it up. Nothing appeared obviously wrong -broken capacitors, melted solder, browned areas, etc.

Given the speakers both worked fine when outside the car, I'm thinking there's something wrong with the amp. Are they both off the same channel in the amp? Any other ideas?
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Old 09-09-2013, 07:36 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 1,146
My Ride: 2001 330Ci
Muffled Audio from Speakers

The oem amp has built in crossovers and dual channel MOSFET amps. Hpw do I know? i gad a problem with my car's audio system and took the cover off the amp to check for burned components. My car gas 10 speakers and noted that the amp had 5 MOSFET amps. My conclusion is the each MOSFET amp feeds a pair of identical speakers. So your premise - both front door subs run from the same MOSFET amp - is plausible.


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Old 09-09-2013, 07:36 AM   #3
markusmarkus
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My Ride: 2001 330Ci
Muffled Audio from Speakers

Too many spelling errrrors. More coffee!


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Old 09-09-2013, 08:39 AM   #4
chiefandy
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Join Date: Sep 2012
Location: Bowie, MD
Posts: 7
My Ride: 2000 323i
Thanks Markus for helping me feel more confident on the diagnosis. I guess it's time to either find a used OEM one or try to figure out a suitable aftermarket one. Not being an audiophile, it's difficult to judge the aftermarket ones. It seems that most of what I'm seeing is when people want to add another bass which typically means a second amp vice just a simple replacement like I'm looking for. The search continues...
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Old 09-10-2013, 07:33 AM   #5
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 1,146
My Ride: 2001 330Ci
Muffled Audio from Speakers

Remember that the head unit signals to the amp are "balanced differential" signals (http://www.maximintegrated.com/gloss...signal/gpk/997). Why? This type of signal is resistant to induced electrical noise. So, if you keep the oem head unit you have 3 options:
- buy line out converters (LOCs)
- buy an amp that accepts balanced differential signals
- buy an oem amp

Good luck!


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Old 09-15-2013, 09:39 AM   #6
chiefandy
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Join Date: Sep 2012
Location: Bowie, MD
Posts: 7
My Ride: 2000 323i
Haven't had any luck identifying an aftermarket amp that works easily. I'm sure they exist, but I'm learning that there are so many options for car audio and I'm much more comfortable with brakes and I'm having to learn some body work

Are you familiar with any audio places in/around DC or online that work with BMWs a lot? I'm somewhat intimidated by trying to figure out the pinout from the OEM cabling. A new OEM amp is more expensive than I'm looking to spend so it might just be a round-robin to the "local" junk yards to get a used one.
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