Bluetooth - Poor sound quality
After several trips to the dealer where they tried tweaking the software on the Star Diagnostic, confirming that my phone has the correct software, confirming that the car's microphone is working correctly, changing out the Auto Wireless Solutions' blue tooth dongle, etc., I still have the same issue.
Yesterday I spoke to Elke, extention 225, in customer service at www.wireless4mb.com and she informed me that my issue is extremely common and she hears the same complaints all the time.
She said the issue is inherent with blue tooth technology and that there is no solution other than going with a hard wired (non blue tooth phone connection) that makes use of the car's antenna and hardware.
I find it odd that on this forum and others I read that people are very satisfied with the operation of their blue tooth phones.
For the record, I can hear perfectly on my end with the call coming through the car's speakers. If not for the fact that the people I talk to on the other end were complaining, I would not otherwise know there is a problem.
Please respond if you have had better experience with your blue tooth connection. I am about ready to bag the experiment and go with a hard wired phone.
I wanted to avoid having two phones, two phone numbers, etc., but if the blue tooth sound quality has not been perfected yet, alas its not worth having sub-par phone conversations particularly when I am talking to clients from my car.
After several trips to the dealer where they tried tweaking the software on the Star Diagnostic, confirming that my phone has the correct software, confirming that the car's microphone is working correctly, changing out the Auto Wireless Solutions' blue tooth dongle, etc., I still have the same issue.
Yesterday I spoke to Elke, extention 225, in customer service at www.wireless4mb.com and she informed me that my issue is extremely common and she hears the same complaints all the time.
She said the issue is inherent with blue tooth technology and that there is no solution other than going with a hard wired (non blue tooth phone connection) that makes use of the car's antenna and hardware.
I find it odd that on this forum and others I read that people are very satisfied with the operation of their blue tooth phones.
For the record, I can hear perfectly on my end with the call coming through the car's speakers. If not for the fact that the people I talk to on the other end were complaining, I would not otherwise know there is a problem.
Please respond if you have had better experience with your blue tooth connection. I am about ready to bag the experiment and go with a hard wired phone.
I wanted to avoid having two phones, two phone numbers, etc., but if the blue tooth sound quality has not been perfected yet, alas its not worth having sub-par phone conversations particularly when I am talking to clients from my car.
Bluetooth is a wireless system, not an adapter to an existing analog or digital system like the connections are in the MB cars, therefore not true.
So my guess is since you convert the bluetooth signal to be played through the car's circuitry, you have to suffer some signal quality loss through the audio stream conversion which goes something like this:
Analog Microphone to Digital or Analog?( the car's system ) to Bluetooth ( the adapter mated your handset ).
I have found another little irritating thing about these adapters. if I am within 30 feet of my car and someone calls me, my command automatically turns on and answers the phone. Of course i can no longer hear them on my handset because their voice is coming through my car speakers which I am not in. The same thing happens if I am on the phone in the car and reach my destination. When I shut of my car the car's system remains active till I end the call or manually disconnect the bluetooth which usually hangs up my call.
My phone sounds great in my 07 Audi because the CAR is bluetooth. No adapters. When I turn off the car if I am on a call, it automatically switches to my handset. Also if I am on a call and I get in my car the system will automatically assume management of the call.It's so seamless, that that caller never knows that I have entered or exited my car. That's Bluetooth!!
I have to conclude this sermon by at least giving credit where it's deserved.
3 years ago, using my PeBL or whichever Motorola phone of my own choosing with my mercedes was completely out of the question. At least now I can use the damn thing, and my phonebook loads automatically with no problems. This creature comfort only cost me 300 and change which is a fraction of what it used to be with many many limitations not too long ago.
So if all I have to do is remember to unplug that stupid adapter when I get out of my car, and remember to plug it back in when I re-enter, for what it's worth, I'll take it.
Maybe it 07 or 08 or 09, MB cars will have waken up and integrated "true" Bluetooth as part of the car's system so to eliminate the need for plug-ins.




Fortunately I use a RAZR, and installed the RAZR BT cradle and all is perfect. No more complaints. Plus it utilizes the in-car antenna and charges the phone. The in-car antenna is amazingly strong.
First in response to my06clk. I reviewed the web site for www.bluetooth.com and the wikipedia definition for bluetooth and have concluded that the device I am currently using is indeed a bluetooth device as defined by the industry protocols.
I am using an MHI Bluetooth Interface Module (sold by www.wireless4mb.com).
The company's web site in reference to this product states "This easy to use device docks in the armrest. This module will update your Mercedes-Benz Hands-Free Communication System to state-of-the-art Bluetooth technology".
From everything I have read about this device and from my own research on bluetooth protocols and how the technology works it sure seems to fit the definition of bluetooth.
Other than that, I agree with the other points made in the post reply. Thanks
As for kjb55, its clear from your post that I indeed confused things with my poll question. I actually want to know how people rate the MHI Bluetooth Interface Module. It sounds like you had it and would rate it poor which is why you switched over to a hard wired option. I recognize that your Razr is bluetooth but it is hard wired into your car's antenna and I already know that solution will work well for me. What I really want to determine is if anyone had gotten the MHI Bluetooth Interface Modual to work the way it was designed to (i.e. with excellent voice quality at both ends).
For those that may be confused, the MHI Bluetooth Interface Modual is desgined to work with your excisting bluetooth compatible phone.
Currently when I enter my car, my phone has a screen that inquires "Do I want to accept the Bluetooth Mercedes connection?" I click yes and from that point on my phone features work through the Mercedes audio system and on board controls.
When I leave the car, the device disconnects either after I manually do so with a click of a botton on my cell phone, or after I have moved a reasonable distance away.
With the Razr bluetooth option that kjb55 is referring to, he manually docks his phone into the car so it is in essence hardwired in. At that point the bluetooth "wireless technology" in his phone is not being utilized for this purpose. It may indeed be a bluetooth phone but when it is hardwired in, the bluetooth technology is not needed (i.e. because there is a hard wired connection).
My guess is kjb55 only uses one phone and takes the Razr with him when he exits the car.
My issue is I use a blackberry to get email and other function on the phone. We have to use blackberry's as my company relies on the enterprise server to minimize hacking concerns of sensitive confidential emails.
The blackberry can not be hard wired into the Mercedes like the Razr phone.
So my options are to get a second phone (like the Razr), leave it in the car at all times and pay a second phone bill, with a seperate telephone number, or get the MHI bluetooth adapter to work the way it was advertised to work.
So to get the thread back on track, has anyone actually managed to get the MHI Bluetooth Interface Module to work as advertised meaning, do the people you are talking to state that your voice is coming through loud and clear?
My guess is kjb55 only uses one phone and takes the Razr with him when he exits the car.
I reported poor audio quality with my wife's Peiker-manufactured BT unit in her Lincoln Town Car, and the fact that Peiker makes the MB BT unit, a year ago. Several other contributors have reported bad voice quality with the MB unit after installation.
I am no fan of the MB BT implementation in the U.S. (the European implementation, which downloads the phone's SIM and uses the vehicle's installed cellular equipment, is far superior, at least in its concept). I use the 2-phone solution myself, with an MB V710 plugged into a cradle (I leave it in the car) and use no-answer call forwarding to a RAZR that I carry. Full compatibility, strong signal, great voice quality.
You don't say what car yours is, and that could affect the equipment and cost needed for such a solution - but it has been the best for me (especially since we already have a family plan and the incremental cost is $10/mo for the additional number). The biggest bitter pill was the purchase of the MB branded V710 at $500 (I already had MHI and a V710 cradle in my car, and a RAZR).
I cannot say from personal experience whether the 2-line approach would provide the features you need with your Blackberry, to any extent greater than just using it completely apart from the car. However, it would give you good voice quality.
Last edited by Skylaw; Dec 31, 2006 at 11:26 AM.
I have a 2006 E500. When I purchased the car it was not wired for a phone system. The cost of having the dealer install the phone system and the MHI bluetooth Module was in the neighborhood of $2,000 as I recall. ouch!
AWS quoted me (yesterday) an additional cost of a new cradel (to replace their bluetooth module) at a cost of $400 to fit the Razr and they said they would sell me the Razr phone for $349 (less a $50 rebate). To this cost I would have to inquire with Verizon to see how much extra they would charge me for another phone on our company service plan (we have all blackberry's on the plan and are charged by the number of minutes so not sure how their plan works with a non blackberry).
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Verizon should only charge you $9.99/month for the extra line.
If you're going to go the route of a docked phone in your E500 and no-answer transfer, save your $750 and take my MB V710 for Verizon with 710 dock. There are pictures and an ad in the classified section... https://mbworld.org/forums/classifieds/170830-fs-c55-head-unit-mb-coded-v710-verizon-cradle.html
The Best of Mercedes & AMG
The other problem is that I had to re-pair my phone with the BT module, and ever since then the BT module, altough it connects fine, will shut itslef (and the COMAND TEL) off after about 1-2 minutes. Switching it on brings it back, but a couple minutes later it is gone again. I've tried disconnecting and reconnecting the phone, the cralde, turning the COMAND on and off, nothing fixes it.
I also notice that the BT does not disconnect when the car swiches off, unlike the Toyota/Lexus (and, from comments above, Audi). Very confusing when the phone rings just after parking the car. Manual disconnect works, but really sells BT short.
I plan to borrow a RAZR and Blackberry Pearl and try those, but so far I have to say M-B still doesn't seem to have figured out the phone thing as well as other automobile manufacturers.
Carlsbad, if you used the RAZR cradle that kjb55 did, you may not need an MB-branded RAZR. The direct antenna connection and the charging are not dependent on the phone's firmware. Further, despite AWS' warnings that not all RAZR phones are "certified" to work with the MB Bluetooth (which is true, because the firmware used by some service providers is not compatible), many contributors have reported success with Verizon's later firmware updates for the RAZR. That would reduce the cost for you, since you can get a RAZR directly from Verizon for far less than $350. Before you spend the money on the MB RAZR, you might get the cradle kjb55 recommended, then borrow a non-MB Verizon RAZR to try it.
Or, if you're going to leave a phone in the car, with a 2-line solution, kjb55's offer of his MB V710 and cradle may be a winner (if you use a plug-in with an MHI system, and without BT, you need an MB branded phone). You could in turn sell your Bluetooth unit.
My MB V710, as I said, was $500 and the cradle about $150 when new.
Unfortunately, neither of the options above helps with your Blackberry - but either would get you clear voice communication when you're in the car. And, if your company had to reach you to alert you to e-mail on the Blackberry, or discuss it, they could.
Last edited by Skylaw; Jan 1, 2007 at 12:27 PM.
Verizon should only charge you $9.99/month for the extra line.
If you're going to go the route of a docked phone in your E500 and no-answer transfer, save your $750 and take my MB V710 for Verizon with 710 dock. There are pictures and an ad in the classified section... https://mbworld.org/forums/showthread.php?t=170830
Thanks for your kindness! I am not in hurry.
I am using Sprint Katana now. The sound quality is terrible, and I am thinking of getting a better phone.
Thanks, again!
Ben
I have a 2006 E500. When I purchased the car it was not wired for a phone system. The cost of having the dealer install the phone system and the MHI bluetooth Module was in the neighborhood of $2,000 as I recall. ouch!
AWS quoted me (yesterday) an additional cost of a new cradel (to replace their bluetooth module) at a cost of $400 to fit the Razr and they said they would sell me the Razr phone for $349 (less a $50 rebate). To this cost I would have to inquire with Verizon to see how much extra they would charge me for another phone on our company service plan (we have all blackberry's on the plan and are charged by the number of minutes so not sure how their plan works with a non blackberry).
Without this hardware you will still be relying on the phone's internal antenna, and that's probably the biggest source of your problem.
I also use a cradled phone (the old v60s from my last car) in my '06. The linear compensator that the dealer initially installed was bad and without a clear path to the external antenna, reception sucked. When they swapped in a new one, everything was crystal-clear again.
Bottom line: without more hardware you're probably not going to get much better performance from a cradle.
Without this hardware you will still be relying on the phone's internal antenna, and that's probably the biggest source of your problem.
Last edited by Skylaw; Jan 8, 2007 at 12:42 AM.




You'll have to be patient, the weather in Chicago is poor and the car is never driven in rain or snow. Unfortunately, I don't know of anyone who has a Sprint phone that could come over and test.
Sorry to make the offer and then delay you.
Don't worry!
Take your time!
Ben
Has anyone been able to get a BB to download the phone book?
Picking up where I left off after my last post, I did take some advice found here and traded in my MHI Bluetooth Interface Module
(which had been previously synced to my blackberry) for an MB MHI Cradle for V3 RAZR and I purchased a new Motorola Razr V3.
Installed the phone and the cradle, placed a call, and for shame.... same old problem.
The good news, if there is any, is that through this process of expensive elimination I can pretty well rule out what is not the source of the problem
So what have I learned? The problem is not in either of the two blackberry phones I tried using with the previous cradle modual, the blackberry software is not an issue, the razr phone is not the issue, the razr software is not the issue, nor the two cradles (as I even swaped out the previous bluetooth modual once before to see if it was the issue....all in all these suspects have been ruled out.
According to AWS they suspect it could be a hardware problem inside the car. At least when I called both the dealer and AWS, using the phone setup, both agreed the quality (from their side) was extremely poor and does not work the way the system is intended. If they did not agree one could argue my bar of expectation is set way too high. Beleive me it is not! I think those of you that are happy with the quality must not have the same issue I am experiencing otherwise the people you talk to on your phones would surely be commenting.
As always, the quality of the sound from my end (inside the car) sounds great. If only it worked well on both ends of the conversation.
AWS says it could be a bad microphone. Dealer said they would be willing to swap out the microphone but claim they have never had a faulty microphone issue before so are doubtful it is the source of the problem.
I know telaid works great using my same microphone so I am not optimisic that it is the source. I tend to agree with the dealer that the problem is probably elsewhere but who knows where?
I am not optimistic they are going to figure out the source of my phone problem given the fact that I have had the car in the dealer about a dozen times and usually when I go to pick it up they say they have solved the problem but when I get out on the road and make calls, the complaints begin anew.
I was so hopeful that the Razr phone, what with it making use of the exterior antenna and linear compensator, would be the fix but it was not to be.
There are a lot more details but you all get the drift.
So its back to the dealer on Monday
Last edited by carlsbad; Jan 20, 2007 at 03:17 PM.
I completely tore out the MB OEM phone setup and replaced it with a Pioneer AVIC-Z1 with bluetooth phone support. The system works great. The people on the other end don't even know that I'm using it. I do not use an external antenna.
When I used cradle with SE K700i, the voice quality was good. However, the K700i was broken. Then, I bought the bluetooth module, tried many different cellphones, always get complaint about the echo. I also tested these phones with Land Rover LR3, the sound quality is much better! It seems the problem is not from these cellphones.... I am so frustrated. I just don't understand why MB can't make good product any more. Maybe finding a new cradle phone and buying a new cradle will be the only chooice for me...
Picking up where I left off after my last post, I did take some advice found here and traded in my MHI Bluetooth Interface Module
(which had been previously synced to my blackberry) for an MB MHI Cradle for V3 RAZR and I purchased a new Motorola Razr V3.
Installed the phone and the cradle, placed a call, and for shame.... same old problem.
The good news, if there is any, is that through this process of expensive elimination I can pretty well rule out what is not the source of the problem
So what have I learned? The problem is not in either of the two blackberry phones I tried using with the previous cradle modual, the blackberry software is not an issue, the razr phone is not the issue, the razr software is not the issue, nor the two cradles (as I even swaped out the previous bluetooth modual once before to see if it was the issue....all in all these suspects have been ruled out.
According to AWS they suspect it could be a hardware problem inside the car. At least when I called both the dealer and AWS, using the phone setup, both agreed the quality (from their side) was extremely poor and does not work the way the system is intended. If they did not agree one could argue my bar of expectation is set way too high. Beleive me it is not! I think those of you that are happy with the quality must not have the same issue I am experiencing otherwise the people you talk to on your phones would surely be commenting.
As always, the quality of the sound from my end (inside the car) sounds great. If only it worked well on both ends of the conversation.
AWS says it could be a bad microphone. Dealer said they would be willing to swap out the microphone but claim they have never had a faulty microphone issue before so are doubtful it is the source of the problem.
I know telaid works great using my same microphone so I am not optimisic that it is the source. I tend to agree with the dealer that the problem is probably elsewhere but who knows where?
I am not optimistic they are going to figure out the source of my phone problem given the fact that I have had the car in the dealer about a dozen times and usually when I go to pick it up they say they have solved the problem but when I get out on the road and make calls, the complaints begin anew.
I was so hopeful that the Razr phone, what with it making use of the exterior antenna and linear compensator, would be the fix but it was not to be.
There are a lot more details but you all get the drift.
So its back to the dealer on Monday

Some people seemed to have lucked out and found a way to get their cars phone system to work great with their bluetooth systems. One wonders if these people in reality have the same inherent flaws but just don't know it (this based on the fact that if you judge the phone reception on the car side it always sounds great....the only way I know the sound quality is poor on the other side of the conversation - the non car side....is because people tell me so....and usually because I ask them but often times they volunteer it. It is possible for me to have a conversation with someone and if no one said a word about the quality I could easily assume the system is working great. So this could well be the reason so many posts on this forum, on this topic, have rated the equipment in the cars as excellent.
Yet another possibility is that those that have excellent working systems in their cars have a particular part that is working as it should and the rest of us have a similar part that is faulty and has not been identifed.
Another possibility is that certain phone and software combinations combined with some tweaking of the star diagnostics results in a great reception.
I am intriqued by the Pioneer AVIC-Z1 solution referenced in this thread but am curious as to what specific part in this hardware results in the fix? From my research it sounds like many of the inner workings of the car's wiring are still integrated into the Pioneer system. It appears to use a different microphone. The electronics inside the modual/cradle that I am currently using (which is manufacturered by Peiker Acoustics for MB) is replaced by a similar type of technology made by Pioneer.
Instead of all of us jumping on MB for making a poor system I wonder if the culprit is really the cradle/modual manufacturer, Peiker Acoustics. PA has a good reputation in general. They are the manufacturer of the Mercedes microphone which if you read the press clippings is supposed to be state of the art, they make the moduals/cradles not just for MB but for many other manufacturers.
With so many complaints now surfacing, I think it would be worth someone with an engineering background to dig a little and figure out specifically what the source of the problem is and who is responsible.
We on this forum tend to assume that what is found inside of an MB is 100% made inside the MB factory. In reality today's modern vehicle, including MB is often a combination of vendors suppling the OEM with parts which come together in a finished vehicle.
Here is an excerpt from a press release for those of you interested in getting closer to whom to throw your darts at:
IRVING, Texas, Jan. 2 /PRNewswire/ - PEIKER acustic, Inc., which
pioneered Bluetooth(TM) vehicle hands-free technology five years ago in
Europe, says its 2005 worldwide sales of conventional and wireless hands-free
kits reached the 500,000 threshold, in part due to strong North American
growth.
PEIKER supplies the hands-free kits, including Bluetooth(TM) wireless
systems, sold by DaimlerChrysler, Ford and several European imports. In North
America. PEIKER's hands-free systems are sold under the UConnect name by
DaimlerChrysler and Mobile-Ease by Ford
PEIKER launched the Bluetooth(TM) vehicle hands-free era in 2000 with the
world's first Bluetooth(TM) car kit, but until 2005, sales of Bluetooth(TM)
units lagged in the United States and Canada. That is changing for two
reasons: the increasing number of regulations banning the use of handheld cell
phones by drivers and the rising popularity of Bluetooth(TM) cell phones,
which tend to be top-of-the-line models with advanced features consumers want like mobile internet service, says Clutton.
PEIKER has won the renowned "Telematics Update Award" from the American
automobile industry for designing and manufacturing the UConnect Bluetooth(TM) system in cooperation with DaimlerChrysler.
PEIKER Bluetooth(TM) units are the most fully featured on the market,
boasting exceptional audio clarity and voice-recognition reliability, a
reflection of PEIKER's six decades of leadership in acoustics R&D. The audio
quality, noise dampening and voice pickup of PEIKER Bluetooth(TM) systems is
so good there is no need for a headset. Some PEIKER Bluetooth(TM) units have their own speaker, while the Mobile-Ease unit sold by Ford utilizes the car's audio system.
Founded in 1946 in Friedrichsdorf, Germany, PEIKER acustic is a leading
manufacturer of high-quality, hands-free speech solutions for the automobile
industry. An accredited supplier to the OEM automotive industry sector,
PEIKER, is compliant to DIN ISO 9001, QS 9000, VDA 6.1 and TS-16949. The
company's product line includes microphones, loudspeakers, handsets,
hands-free car kits and telematic solutions with a wide range of patent rights
covering vehicle communication equipment. PEIKER's customers include (among others) Chrysler, Ford, Mercedes-Benz, BMW, Qualcomm, Motorola, and LG InfoComm. Subsidiaries are located in France and the United States.
PEIKER North America has its head office in Irving, Texas as well as an R&D and engineering office in Detroit and a plant in Mexico that supplements the
company's principal manufacturing facility in Germany".
So the next time someone throws a dart at MB and says they can't make a decent blue tooth system (for shame), you might want to modify your statement to at least say they can't seem to select a good vendor. The real dart should be directed at Peiker Acoustics and their engineers if indeed the problem is in the moduals/cradles or some other related componet (i.e. the microphone).
Swapping out the Command Unit with a Pioneer AVIC-Z1 may be a good solution but one has to wonder why it works, is it the cradle/modual that is replaced in this set up that makes it all work? Its a very expensive solution to replace the command unit with the Pioneer. I suspect the installed cost would run over $2,000. Add that to the cost I have already invested to 1) equip the vehicle to have a phone wiring harness etc - $2,000, the two different moduals I purchased one at $300 and the other at $400, add to that the cost of another new phone to equip it to work with the latest cradle and I would probably be looking at a total cost of $4,000 - $5,000 to get a decent phone call at the end of the day. No way I am going down that path! Too expensive a solution!
To conclude, I would welcome some enginnering types to dig down and identify why the MB/Peiker Acoustics system is not working as designed and enlighten the rest of us.
Last edited by carlsbad; Jan 21, 2007 at 10:12 AM.
Did you get the V-3 RZR from AWS to pair with the Bluetooth cradle? I am interested in that set-up, and I can get the phone from Verizon for much less than from AWS, but they claim theirs has a different (required) software version.
TIA,
John
I had a challenge getting the correct software version from our Verizon rep but eventually managed to locate the phone with the software that AWS specified. AWS would not ship the cradle until we confirmed we had the correct software as they say we would otherwise end up with an expensive phone charger that would not function as intended.
The new Razr phone comes with a more current software so you will need to find one in stock that is about six months old and compatitble with the AWS cradle.....or so they claim. You might get it to work with the newer software that comes with the current Razr phones, but I didn't go down that path. I didn't want any excuses from AWS if this phone was not working as advertised. It is paired but not working to my satisfaction as you can see from my thread above.
As we speak the dealer has my car and is trying to get the voice reception quality to function as well as advertised. we are now on day 2 with my car in the shop
Last edited by carlsbad; Jan 23, 2007 at 01:09 PM.















