E90Post
 


VIBE Motorsports
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Bass cutting in and out - Amp or Wiring or Other?



Reply
 
Thread Tools Search this Thread
      08-24-2011, 03:19 PM   #1
Nemsys
Registered
 
Drives: 2007 335i Convertable
Join Date: Aug 2011
Location: Tampa, FL

Posts: 4
iTrader: (0)

Unhappy Bass cutting in and out - Amp or Wiring or Other?

Hey all,
I have an 07 335I Convertible with iDrive and the Logic 7 setup.

For the past few months I have noticed that in the middle of a song (can be radio, cd, aux) suddenly there is no bass from any speakers.

Sometimes it might start again in a few seconds and not happen for several weeks again. (I first thought my iPod cable was loose). However, it has been very hot and the last three days it has gotten much more pronounced where there where be no bass for 10 mins at a time. Turning the car off and waiting awhile and turning it back on sometimes fixes it. Sometimes just turning the sound off and waiting fixes it. Sometimes it does not.

When the subs cut out, there is NO change to the rest of the speakers.

When it is working it is very strong and sounds like it did when I got the car.

Is it likely to be the amp it self? Is it just overheating? (its been 95+ here outside temp lately). Possible loose wire? Something else?

I am out of warranty so it is $150 just for the dealer to diag the issue (and since it is intermittent they probably will not find anything wrong).

Suggestions?

Thanks all!

Last edited by Nemsys; 08-24-2011 at 03:21 PM. Reason: Adding info
Nemsys is offline  
0
Reply With Quote
      08-24-2011, 03:37 PM   #2
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,937
iTrader: (17)

Garage List
2004 M3  [0.00]
Quote:
Originally Posted by Nemsys View Post
Hey all,
I have an 07 335I Convertible with iDrive and the Logic 7 setup.

For the past few months I have noticed that in the middle of a song (can be radio, cd, aux) suddenly there is no bass from any speakers.

Sometimes it might start again in a few seconds and not happen for several weeks again. (I first thought my iPod cable was loose). However, it has been very hot and the last three days it has gotten much more pronounced where there where be no bass for 10 mins at a time. Turning the car off and waiting awhile and turning it back on sometimes fixes it. Sometimes just turning the sound off and waiting fixes it. Sometimes it does not.

When the subs cut out, there is NO change to the rest of the speakers.

When it is working it is very strong and sounds like it did when I got the car.

Is it likely to be the amp it self? Is it just overheating? (its been 95+ here outside temp lately). Possible loose wire? Something else?

I am out of warranty so it is $150 just for the dealer to diag the issue (and since it is intermittent they probably will not find anything wrong).

Suggestions?

Thanks all!
Remove the grey plastic cover on top of the OEM amp, let more air into the OEM... rinse and repeat. If the problem goes away or it is much less frequent then I would suggest a custom small 12V fan on that cover.

If the problem does not goes away then the heat really messed your OEM amp internals up and it is not coming back to normal.
__________________
-2015 F30 320i, Imperial/Oyster, 8AT: August 2014 ED
-2012 E92 M3 Jerez Black/Rust Brown, M-DCT: September 2011 ED
-2008 E90 M3 Melbourne Red/Bamboo, 6MT: Gone
-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone
Technic is offline   United_States
0
Reply With Quote
      08-24-2011, 07:03 PM   #3
Ron1n
Speed Demon
 
Ron1n's Avatar
 
Drives: '10 335d E90
Join Date: Oct 2009
Location: The 858

Posts: 3,248
iTrader: (4)

Garage List
2010 335d  [5.00]
Quote:
Originally Posted by Technic View Post
Remove the grey plastic cover on top of the OEM amp, let more air into the OEM... rinse and repeat. If the problem goes away or it is much less frequent then I would suggest a custom small 12V fan on that cover.

If the problem does not goes away then the heat really messed your OEM amp internals up and it is not coming back to normal.
The AMP that comes with the car seems to heat up pretty quickly. I'm constantly hearing the AMP fan on when I go to the trunk after driving. Thankfully, I haven't had the same problem he's had, but it sure does seem to run hot.
Ron1n is offline   United_States
0
Reply With Quote
      08-25-2011, 07:50 AM   #4
Nemsys
Registered
 
Drives: 2007 335i Convertable
Join Date: Aug 2011
Location: Tampa, FL

Posts: 4
iTrader: (0)

Quote:
Originally Posted by Technic View Post
Remove the grey plastic cover on top of the OEM amp, let more air into the OEM... rinse and repeat. If the problem goes away or it is much less frequent then I would suggest a custom small 12V fan on that cover.

If the problem does not goes away then the heat really messed your OEM amp internals up and it is not coming back to normal.
Ok, I failed at finding a diagram of where the amp is in the car. There are three boxes (one with a fan) easily accessible under the partition in the floor of the trunk. However, a few posts here seam to indicate that the amp is in the left rear section. I spent some time trying to remote it (unsuccessfully). Does anyone know if the amp is the unmarked top left box? If not, are there any tutorials on how to gain access?

On a side note, I am going to go with overheating as it was cooler this morning 78 degrees and I had no issues this morning.

Thanks for the replies.
Nemsys is offline  
0
Reply With Quote
      08-25-2011, 08:00 AM   #5
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,937
iTrader: (17)

Garage List
2004 M3  [0.00]
Quote:
Originally Posted by Nemsys View Post
Ok, I failed at finding a diagram of where the amp is in the car. There are three boxes (one with a fan) easily accessible under the partition in the floor of the trunk. However, a few posts here seam to indicate that the amp is in the left rear section. I spent some time trying to remote it (unsuccessfully). Does anyone know if the amp is the unmarked top left box? If not, are there any tutorials on how to gain access?

On a side note, I am going to go with overheating as it was cooler this morning 78 degrees and I had no issues this morning.

Thanks for the replies.
There is only one grey plastic cover in your trunk, on the left side corner. Remove the cover (just pry it) and you will see the amp.
__________________
-2015 F30 320i, Imperial/Oyster, 8AT: August 2014 ED
-2012 E92 M3 Jerez Black/Rust Brown, M-DCT: September 2011 ED
-2008 E90 M3 Melbourne Red/Bamboo, 6MT: Gone
-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone
Technic is offline   United_States
0
Reply With Quote
      08-29-2011, 08:54 AM   #6
Nemsys
Registered
 
Drives: 2007 335i Convertable
Join Date: Aug 2011
Location: Tampa, FL

Posts: 4
iTrader: (0)

It would appear that the two fans are not spinning up or seized. After driving home in 94 degree weather without the grey cover, the amp was too hot to touch, but using a flashlight and creatively getting my head in the trunk, I was able to see that the fans were not spinning.

I searched a bit, and the only close I can find was someone selling what looked like a CPU case fan to be bolted to the cd changer bracket above the amp, although I didn't see where they would be pulling power from (obviously it is there though).

Any suggestions on the best way to proceed would be appreciated.
Thank you for the feedback so far - I think I am getting closer.
Nemsys is offline  
0
Reply With Quote
      09-02-2011, 12:24 PM   #7
trk06
Lieutenant
 
trk06's Avatar
 
Drives: with no spare
Join Date: Nov 2010
Location: NC

Posts: 455
iTrader: (1)

Quote:
Originally Posted by Nemsys View Post
It would appear that the two fans are not spinning up or seized. After driving home in 94 degree weather without the grey cover, the amp was too hot to touch, but using a flashlight and creatively getting my head in the trunk, I was able to see that the fans were not spinning.

I searched a bit, and the only close I can find was someone selling what looked like a CPU case fan to be bolted to the cd changer bracket above the amp, although I didn't see where they would be pulling power from (obviously it is there though).

Any suggestions on the best way to proceed would be appreciated.
Thank you for the feedback so far - I think I am getting closer.
I hate to say it but your amp need replacement. same thing happaned to me. i gradually lost speakers. first started the cutting-out later some speaker dont work finally i had only the center dash speaker and driver side door speaker working. .
Just got a new amp replaced it. now everything working like before. let's hope all good.
__________________
trk06 is offline   United_States
0
Reply With Quote
      09-12-2011, 04:03 PM   #8
805beemer
Captain
 
Drives: 2008 135i
Join Date: Jul 2011
Location: Lompoc, CA

Posts: 614
iTrader: (3)

I have the logic 7 also and my subs haven't been working for the past month or so. Also it seems like i have to turn up the volume more than i used to. I'm still under warranty, what is bmw's policy on replacing audio components? Are there any wires under the seat that my have come loose or been damaged that i can check?
805beemer is offline   United_States
0
Reply With Quote
      09-12-2011, 04:24 PM   #9
fdriller9
Banned
 
Drives: '06 AW 330xi
Join Date: Mar 2009
Location: North Jersey/Philly/NYC

Posts: 7,090
iTrader: (4)

Garage List
2006 330xi  [3.22]
If you're fans are not working, that is an easy fix.

Any audio shop or even a computer shop can do it.
fdriller9 is offline   United_States
0
Reply With Quote
      09-12-2011, 07:45 PM   #10
Rudeja
Second Lieutenant
 
Rudeja's Avatar
 
Drives: 2011 535i Sport
Join Date: Jul 2010
Location: Atlanta , GA

Posts: 253
iTrader: (0)

WOw, i just saw this thread, I have a 08 335i with logic 7 and my Amp cut in and out also, I thought I had a blown Amp but after reading this I see that Its BMW issue. gonna hit the stealership tomorrow to see if I can get it replaced
Rudeja is offline  
0
Reply With Quote
      10-20-2011, 11:00 AM   #11
darkevo
Commander
 
darkevo's Avatar
 
Drives: 2011 335d MSport, 2010 Prius
Join Date: Dec 2010
Location: Los Angles, CA

Posts: 249
iTrader: (9)

Send a message via AIM to darkevo
how much was the new amp?


Quote:
Originally Posted by turk06 View Post
I hate to say it but your amp need replacement. same thing happaned to me. i gradually lost speakers. first started the cutting-out later some speaker dont work finally i had only the center dash speaker and driver side door speaker working. .
Just got a new amp replaced it. now everything working like before. let's hope all good.
__________________
2011 335D E90 M-sport Space Gray - JBD, K&N, M3 interior conversion, GiroDisc Rotors
2010 Prius III
1997 Eclipse Spyder GS-T
darkevo is offline  
0
Reply With Quote
Reply

Bookmarks

Tags
amp, bass, subwoofer

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 06:59 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST