Right front speaker distortion

20ducks · 03-12-2009, 12:14 AM

Trying to figure out root cause of distortion. It is only the right front speaker. I checked the HK speaker by removing the door panel to see if it had become loose. Nope. I took an old Alpine R series 6.5" and it produced the same distortion at certain frequencies/volume. Would it be the amp? Any ideas and alternative tests I should conduct..please advise.

TIA,
Greg

TURBOs2000 · 03-12-2009, 07:50 PM

I have the same problem

20ducks · 03-12-2009, 08:11 PM

I'm relatively new to M3's (not new to BMW's) is this a common problem? Has it been determined to be the amp or something else? Lastly, any ideas on a remedy?

shinbo · 01-09-2011, 02:10 PM

Bump. I'm having the same exact issue with the same exact speaker. Any ideas?

calialx1 · 01-09-2011, 07:16 PM

same here, thought it was just the speaker

zYx · 01-10-2011, 03:52 AM

It can be radio module/sound processor, known as BM54 or BM24 depending on audio system and MY of the car.
Try searching the internet for BM54 or BM24 radio module, so you can get an idea of various problems it can cause.

For instance, I have a problem when I turn down the volume, it makes distortion sound on all speakers (amplifies bass and mid-bass, kills tweeters and generally turns up?!?! the output, until I completely turn it down/mute).

It is located in left part of the trunk (silver box with one square connector), bellow navigation dvd/cd changer, accessible when you remove trunk liner.

03-12-2009, 12:14 AM	#1
20ducks Registered User Join Date: Jan 2009 Location: Shawnee Mission, KS Posts: 539 My Ride: E46 M3 Cabrio View My Garage	Right front speaker distortion Trying to figure out root cause of distortion. It is only the right front speaker. I checked the HK speaker by removing the door panel to see if it had become loose. Nope. I took an old Alpine R series 6.5" and it produced the same distortion at certain frequencies/volume. Would it be the amp? Any ideas and alternative tests I should conduct..please advise. TIA, Greg

03-12-2009, 07:50 PM	#2
TURBOs2000 Registered User Join Date: Jan 2009 Location: Kalamazoo, MI Posts: 71 My Ride: 330i View My Garage	I have the same problem __________________ $C:\Documents and Settings\Kristian\My Documents\My Pictures\s2ksignature.jpg$

01-09-2011, 07:16 PM	#5
calialx1 Registered User Join Date: Aug 2009 Location: lost in the twisties of the Bay Area, CA Posts: 253 My Ride: FL 330i, 3000GT View My Garage	same here, thought it was just the speaker __________________

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03-12-2009, 08:11 PM	#3
20ducks Registered User Join Date: Jan 2009 Location: Shawnee Mission, KS Posts: 539 My Ride: E46 M3 Cabrio View My Garage	I'm relatively new to M3's (not new to BMW's) is this a common problem? Has it been determined to be the amp or something else? Lastly, any ideas on a remedy?

01-09-2011, 02:10 PM	#4
shinbo Registered User Join Date: Sep 2008 Location: Philly Posts: 16 My Ride: 03 M3 View My Garage	Bump. I'm having the same exact issue with the same exact speaker. Any ideas?

01-10-2011, 03:52 AM	#6
zYx Registered User Join Date: Jul 2009 Location: Belgrade Posts: 31 My Ride: 2003 325CiA View My Garage	It can be radio module/sound processor, known as BM54 or BM24 depending on audio system and MY of the car. Try searching the internet for BM54 or BM24 radio module, so you can get an idea of various problems it can cause. For instance, I have a problem when I turn down the volume, it makes distortion sound on all speakers (amplifies bass and mid-bass, kills tweeters and generally turns up?!?! the output, until I completely turn it down/mute). It is located in left part of the trunk (silver box with one square connector), bellow navigation dvd/cd changer, accessible when you remove trunk liner.