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      10-07-2018, 08:21 AM   #1
technician117
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B&O bass cutting out

I just picked up my 2013 M5. During the 12 hour drive home, I was able to learn most of the "electronics". One of the things I noticed after a while is that although the sound quality of the radio was good, the bass would go out. Then randomly it would come back on. At first I thought maybe it had something to do with the reception on the radio but when I was in areas I knew the reception was good and it still had no bass, I knew something was up. Anyone experience this? Sounds like an amp problem? Where is the amp located? I wonder if someone messed with it before and the connection is just loose? Probably wishful thinking.

Any input appreciated!
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      10-10-2018, 05:36 AM   #2
DL7
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It is to the left side of the trunk under the carpet. See below which will show you.

https://f10.m5post.com/forums/showthread.php?t=983411
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      10-10-2018, 08:23 AM   #3
technician117
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Quote:
Originally Posted by DL7 View Post
It is to the left side of the trunk under the carpet. See below which will show you.

https://f10.m5post.com/forums/showthread.php?t=983411
Thanks, I'll check it out. I'm pretty sure the ASD is turned off in my car, so maybe if they went the "unplug" route rather than coding, they partly disconnected the amp on accident. I'm assuming the amp is the large module underneath the ASD module.
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      10-10-2018, 08:28 PM   #4
DL7
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Yes, I believe so. You can find used b&o amps online. New ones are expensive.
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      10-11-2018, 09:21 AM   #5
technician117
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Quote:
Originally Posted by DL7 View Post
Yes, I believe so. You can find used b&o amps online. New ones are expensive.
I did a quick search yesterday. Looks like I can get a used one for around $900. I'll do some diagnostics first though to confirm it is indeed the amp.

Thanks for the help so far.
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      02-05-2019, 11:59 AM   #6
technician117
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Quote:
Originally Posted by technician117 View Post
I did a quick search yesterday. Looks like I can get a used one for around $900. I'll do some diagnostics first though to confirm it is indeed the amp.

Thanks for the help so far.
I forgot to update my thread. The amp was indeed bad. I bought a used one on eBay when there was a 15% off coupon.

I wonder if there is anyone out there that can refurbish them? Quite a costly piece of hardware to go bad. Mine otherwise was in good condition physically with only the bass aspect failing on it.
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