Terrible bluetooth audio quality after upgrading to WM6.5 (Touch Pro2 WWE)

[arbuckle]

Hi all,

Before upgrading my Touch Pro2 WWE to WM6.5 I was perfectly happy with the bluetooth sound quality. Sure, I did tweak it using a registry editor (months ago, I don't recall the exact changes I made), but the sound quality was marvellous. And...: no hickups!

As probably most of you already did, I upgraded my TP2 to WM6.5 about two weeks ago. So far I like WM6.5, I even get the feeling it has a slight better battery usage.

However, there is one big downside to this upgrade operation: I can't get the bluetooth audio quality on my Jabra headset to meet the quality it had on WM6.1. I used a registry editor to tweak the BitPool and UseJointStereo settings, but still I constantly have the feeling I'm listening to 96 kbit/s MP3 files, whilst the files are of >= 192 kbit/s quality... Also, music sometimes just 'hangs' (silence), and continues after a few seconds.

Am I missing something? Are there other parameters I need to tweak? I'd like to know which settings you guys use. Thanks!

[SLONUM]

Hi all,

I have the similar problem on my Diamond2. But I didn't used bluetooth headset while having WM6.1, so I can't tell was the audio quality good or bad.

I have silence gaps of 0.5-2s all the time listening to music. The gaps length and frequency doesn't seem to depend on the distance or obstacles (reasonable ones) between the phone and headset. They can be one inch one next to another but the gaps will be present.
However, the audio quality seem to be good.

I have TDiamond2(first official WM6.5 ROM from october 2009) + Jabra BT620s. I've tried various registry tweaks found here and in internet but with no result. Maybe I've missed somthing. Any ideas what might cause gaps?

Thanks in advance!

[arbuckle]

I think I just found a (the) solution! Check out this post at smartphonemag.com:
http://www.smartphonemag.com/cms/blogs/3/1350#more1350

Particularly, look at the LineSpeed DWORD, located in HKEY_LOCAL_MACHINE\SOFTWARE\Widcomm\Plugin\AV

Setting it to 320 and resetting the bluetooth functionality led to a considerably better audio quality. Other settings which I have changed (don't know if they're relevant):
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Bluetooth\A2 DP\Settings
BitPool = 58 (DWORD)
SampleRate = 48000 (DWORD)
UseJointStereo = 1 (DWORD)

(all decimal values)

Good luck!