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Old Yesterday, 12:20 AM   #1
Registered User
Join Date: Jun 2011
Location: NE Ohio
Posts: 148
My Ride: '04 330Ci (6 Speed)
OEM Bluetooth sound quality

Hi all,

Several months back I switched out my Assist TCU with a Bluetooth TCU I bought on eBay. I installed the antenna and the bracket as well, and the mic I already had (apparently, the updated one came installed). The Bluetooth works but the sound quality is deplorable. I'm referring to the sound quality on both ends, specifically mine. It doesn't sound crisp at all. Siri can't understand a word (via the Bluetooth mic) and the whole thing is just subpar.

Did I mess up the install or do I just have unrealistic expectations for a Bluetooth solution from 10 years ago?

Last edited by invictvs; Yesterday at 12:23 AM.
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Old Yesterday, 12:47 AM   #2
Registered User
Join Date: Oct 2008
Location: Los Angeles, CA
Posts: 2,584
My Ride: 05 330i ZHP/MT
I can't complain about the sound quality of my ULF13, and particularly about the incoming sound signal.
At times while driving on the freeway, people tell me on the phone they didn't hear me, so I have to repeat, but that's all. The voice commands work ok.

Last edited by Megalocnus; Yesterday at 12:48 AM.
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Old Yesterday, 02:14 AM   #3
Registered User
Join Date: May 2012
Location: Orange County, CA
Posts: 318
My Ride: 05 BMW 330i ZHP 6MT
Mine works great. Siri understands me (I make sure to talk loud and clear) most of the time. I bought the newest Bluetooth module when I did the retrofit.
2005 BMW 330i ZHP 6 speed
Stock: Nav, leather, PDC
Added by me: OEM Alarm, OEM heated seats, OEM aux kit, OEM Bluetooth, intravee, M3 strut brace, BMW Performance Intake, Nappa leather arm rest, updated LCM (triple blink, euro hazards, trifecta lighting, 3 stage brakes), temp gauge mod
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Old Yesterday, 11:39 PM   #4
Registered User
Join Date: Jun 2011
Location: NE Ohio
Posts: 148
My Ride: '04 330Ci (6 Speed)
Hmm, I wonder if any of the connections are loose. It just sounds a bit staticky and grainy; not what you would expect from an oem Bluetooth. Does it sound very crisp to you guys? Maybe my TCU is faulty.

I installed one of those cheap $35 bluetooths (that connect via the aux input) in my girl's car and it sounds much better than mine. Maybe I should install that Parrot I have laying around.
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