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Originally Posted by chronster
First - The absolute best sound quality from phone to stereo comes from the auxiliary input, just as others have said. The sound quality is phenomenal. I disabled the audio boost application that automatically starts when headphones are connected, and the sound quality blew my mind (I've got subs so that helps too lol.)
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Honestly, I'm willing to bet that you didn't optimize your A2DP settings.
I've been working with A2DP for years already (since the first hacked dlls were available for windows mobile 5), and getting good quality out of it has been a long and complicated saga.
The point, however, is that when done RIGHT, you shouldn't really be able to tell much of a difference between wired and wireless music.
The problem is that HTC and/or Microsoft decided to cap the bandwidth used to encode your music on the fly. This setting exists in the registry, and is called the bitpool. By default, this is set to 30, which is EXTREMELY low and will create a noticeable hiss on high quality speakers.
People have speculated turning that value up higher, but for our modern phones with faster CPUs, its best to just take the whole bitpool setting out completely, and let the encoder determine its own bitrate without a cap.
More on this here:
http://forum.xda-developers.com/showthread.php?t=308752
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Bluetooth sound quality was AMAZING for wireless. There is a slight hiss however when the song is paused. It goes away after a few seconds. I guess when nothing is being heard, the stereo cuts the sound or something, but immediately after pressing play the sound returns. Also, song name is not displayed while playing mp3s. I thought this was a per song issue, but none of my songs names were displayed while playing. Bummer.
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The hiss is probably defined by the phone keeping the channel open, and caused by the compressed encoder mentioned above.
Song names is actually NOT part of A2DP, or AVRCP. There is an addition BT profile responsible for the additional information like that, and its not a standard one so most phones/receivers don't use it. The Sony stereo does because the Sony-Ericsson Walkman phones do.
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A note about Bluetooth and delay: When watching a video in coreplayer, bluetooth audio worked, but there was a noticable delay. If I were to entertain a passenger with a movie or two on a long trip, I'd recommend using the auxilary connection.
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Bah, and clutter it up with a wire? NEVER!
Set your audio sync to -300msec, and it will line up perfectly. If you use coreplayer primarily, then set TCPMP to -300, and only use it when streaming wireless audio, and coreplayer set to 0 the rest of the time. Solved!
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Talking on the phone on this thing is really easy, but sound quality on the other user's end is going to be bad. I listened to what my father sounded like when he spoke to me from inside my car, and there is definitely an echo.
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I think this is because of the mic placement... not sure how it works on the one you got, but I personally use the BT2500, and the mic is on the head unit. That means if you have to
sort of talk at your dashboard in order to be heard clearly. Otherwise, its just picking up the sound echoing around the cabin of your vehicle. I usually don't use it for hands free calling for more than a min at a time, and during that minute I lean into my center console to talk. Awkward.
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All in all, I'm very pleased with the BT2600 for both it's price and functionality. If I had spent another 100-150, I could have gotten a radio that downloads your phonebook, and also has better control over your mp3s via bluetooth (pause as well as display the name of the song.)
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Not necessarily. See my display song comment above. Its not part of the standard profile- remember, A2DP was meant to stream full quality sound, which isn't necessarily just Mp3's... it could be a live mic stream, or just simply the system sounds of your device (which don't have an id3 tag!). The information profile came later and is *not* standard.
The only reason to go for the pricier ones (BT5000?) is because of call quality, I think. The high end ones let you mount a mic closer to your face, and initiate voice command from the head unit.
Either way, glad to hear you like it, and enjoy!