Cracking/distorted bass in L7 but no speaker malfunction

Clayton7109 · 07-17-2016, 04:57 PM

Hi all,
For some reason mid and low range sound in my 2008 e92 335i cracks crinkles at mid and low range bass. This is especially noticeable when I have the volume turned up, but seems to be happening all the time. I originally had a cheap "walmart" brand aux cord and figured it was the cheap aux not being able to output crystal clear sound, but when I upgraded to a nicer cord, it didn't help any. I did research and saw everything on here from water in the amp to blown speakers and subs, but after checking everything I can confirm it is none of the above. All of the speakers work fine and the crinkling sound comes out of ALL of the speakers, not just the subs under the seat. I even tried to isolate the crinkling sound to the front, back or sides, but it still continues in all the speakers. Again, all the electronics seem to be fine, just not sure why the speakers are cracking.

For the first time the other day, the bass cut out on me for about 15 minutes when I was playing music loud, and then came back on. I figured this was just a safety mechanism to prevent speakers from blowing under high output...but then again, maybe it could be a sign of something going wrong.

Please let me know if you have any ideas as it's really annoying having a $52k car and not being able to play music loud and clear. Thanks!

ctuna · 07-17-2016, 05:36 PM

Does it do the same with a CD .
Most common problem with L7 is the amp gets drowned
by water leaks.
Its not really a system you can slam very much .

007_e350 · 07-17-2016, 08:07 PM

I had windshield fluid leak in the trunk, thanks walmart, and loud cracking from speakers when I turned on radio... amp is toast, I also get sos failure which is an indication o's the same...

Clayton7109 · 07-21-2016, 03:52 PM

Quote:

Originally Posted by ctuna

Does it do the same with a CD .
Most common problem with L7 is the amp gets drowned
by water leaks.
Its not really a system you can slam very much .

That was a good question. I checked and no it does not do it with cd, any ideas? It is so annoying. Wish I could really bump it.

ctuna · 07-21-2016, 03:58 PM

Aux Input is known to be crap.
Some people use a headphone Dac such as the Fifo to improve
this but the best way to get around it is to add something
like the Dension gateway 500 s bt or the equivalent mobridge unit. And go directly to usb with high bit rate files.
If you are using low bit rate source files nothing will help that.

Also the L7 system has limited output.

http://www.e90post.com/forums/showthread.php?t=1002984

whyzee125 · 07-25-2016, 09:38 PM

I have the same issue -- leaning towards bad amp. Let me know if you figure it out and I'll do the same.

07-17-2016, 04:57 PM	#1
Clayton7109 Registered 0 Rep 4 Posts Drives: 2007 335i Join Date: Feb 2015 Location: Virginia iTrader: (0)	Cracking/distorted bass in L7 but no speaker malfunction Hi all, For some reason mid and low range sound in my 2008 e92 335i cracks crinkles at mid and low range bass. This is especially noticeable when I have the volume turned up, but seems to be happening all the time. I originally had a cheap "walmart" brand aux cord and figured it was the cheap aux not being able to output crystal clear sound, but when I upgraded to a nicer cord, it didn't help any. I did research and saw everything on here from water in the amp to blown speakers and subs, but after checking everything I can confirm it is none of the above. All of the speakers work fine and the crinkling sound comes out of ALL of the speakers, not just the subs under the seat. I even tried to isolate the crinkling sound to the front, back or sides, but it still continues in all the speakers. Again, all the electronics seem to be fine, just not sure why the speakers are cracking. For the first time the other day, the bass cut out on me for about 15 minutes when I was playing music loud, and then came back on. I figured this was just a safety mechanism to prevent speakers from blowing under high output...but then again, maybe it could be a sign of something going wrong. Please let me know if you have any ideas as it's really annoying having a $52k car and not being able to play music loud and clear. Thanks!
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07-17-2016, 05:36 PM	#2
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Does it do the same with a CD Does it do the same with a CD . Most common problem with L7 is the amp gets drowned by water leaks. Its not really a system you can slam very much .
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07-17-2016, 08:07 PM	#3
007_e350 Lieutenant Colonel 217 Rep 1,909 Posts Drives: 335i 2008 MHD'd / x5d E70 Join Date: May 2013 Location: left lane iTrader: (3)	I had windshield fluid leak in the trunk, thanks walmart, and loud cracking from speakers when I turned on radio... amp is toast, I also get sos failure which is an indication o's the same...
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07-21-2016, 03:58 PM	#5
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Aux Input is known to be crap. Aux Input is known to be crap. Some people use a headphone Dac such as the Fifo to improve this but the best way to get around it is to add something like the Dension gateway 500 s bt or the equivalent mobridge unit. And go directly to usb with high bit rate files. If you are using low bit rate source files nothing will help that. Also the L7 system has limited output. http://www.e90post.com/forums/showthread.php?t=1002984
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07-25-2016, 09:38 PM	#6
whyzee125 Brigadier General 1679 Rep 3,645 Posts Drives: Dinan stage 2 335i Join Date: Jul 2014 Location: Chattanooga Tn iTrader: (0)	I have the same issue -- leaning towards bad amp. Let me know if you figure it out and I'll do the same.
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