Related
I use a no brand Stereo BT headset on the Atom and found the quality is unacceptable poor. I just want to confirm if it's just me or it's a common problem for Atom.
I found the BT stereo quality very poor too. Tried
1. i-Tech S35
2. Gobalsat BT-830 (apart from stop/pause, AVRCP works fine with WM 10)
3. Nokia HS-12W (apart from stop/pause, AVRCP works fine with WM 10)
quality is way worser compared with the original headphone that came with Atom. I read somewhere this was due to the poor audio chipset used in Atom. Any way to fix that?
BTW, all the above 3 Bluetooth stereo headsets have excellent audio output when listening music from PC (using Widcomm 4.0.1.2800).
I believe it was due to the BT version used. I too tried
1. i-Tech R35 (V1.2)
2. Nokia HS-12W (V2.0)
When pairing both of them with Atom, the sound quality is not that good (always got hissing sound). The same applies when I use the i-Tech headset with my 818pro.
On the other hand, when I use the Nokia headset with 818pro (A2DP enabled), the quality becomes quite good (no significant difference from wired headsets). BTW, I think the Moto BT headset supports V2.0 too, and seems ppl around got some good experience with it and 818pro.
As I mainly use my Atom nowadays (my 818pro got the screen misalignment problem unfortunately), I already forgot about BT headsets.
From all you guys comments, I am not alone in having poor A2DP quality. It's a shame for giving out A2DP but unacceptable quality. :evil:
I-tech S35
Thanks so much for that information. I was really tempted to "upgrade" to an Atom from my Mini because the former had the built in bluetooth so it's a good thing to know I shouldn't upgrade because I was really after the A2DP functionality (since I thought the full release a2dp would be much better than the mini's "hacked" a2dp).
Maybe the stack used on the Atom is not that good. Have you tried upgrading the ROM?
[email protected]
what are u guys sayin ?
the quality of A2DP in my Atom (last ROM upgrade) is excellent !
and i do know how to appreciate the quality, cause i came from a V3x (quality was amazing too).
i am using the motorola HT-820.
the sound is much better than my crappy ipod video (to sell if someone interested) :arrow:
to fix ur problems, u should :
1- upgrade to the latest rom.
2- turn the crappy equalizer off (its a really useless feature)
3- when u go to bluetooth settings, hold ur bluetooth device and '' set as wireless stereo''
that may be the key for clearer sound.
also i didnt like the equalizer (am i alone ?) i found that the speakers are worse than ever.
what do u guys think? :arrow:
Re: [email protected]
goldsaint said:
what are u guys sayin ?
the quality of A2DP in my Atom (last ROM upgrade) is excellent !
and i do know how to appreciate the quality, cause i came from a V3x (quality was amazing too).
i am using the motorola HT-820.
the sound is much better than my crappy ipod video (to sell if someone interested) :arrow:
to fix ur problems, u should :
1- upgrade to the latest rom.
2- turn the crappy equalizer off (its a really useless feature)
3- when u go to bluetooth settings, hold ur bluetooth device and '' set as wireless stereo''
that may be the key for clearer sound.
also i didnt like the equalizer (am i alone ?) i found that the speakers are worse than ever.
what do u guys think? :arrow:
Click to expand...
Click to collapse
How's it compared with the using the original headset came with your Atom? For me, bluetooth A2DP is way worse.
I used the same i-Tech clip S35 on XDA 2i, and the A2DP qualitiy is as good as the wired headset came with XDA 2i.
Thanks.
Wired vs Wireless
ok, with the regular wired stereo headset the sound is Ok, but not that good if i compare to my ipod video.
i highly prefer the a2dp system as it seems ur inside a nightclub while using it.
but if i have to choose between the wired headsets or the HT820, i would rather go with the BT headset.
the only thing, is that dangerous for life ? (like getting brain cancer etc... wish not..)
As I mentioned before, I have tested all the combinations for 818pro, Atom (both with latest rom) and two BT headsets i-Tech R35 and Nokia HS-12W, and only found that the BT 2.0 combination, ie, 818pro with HS-12W, produces good enough music quality. For all other combinations, there is always some pretty obvious hizzing sound around when playing a soung. That hizzing sound is not background sound, as it won't appear if I stop playing any song. It only appears when a certain part of a song is played.
It seems to me that the hizzing sound is caused by insufficient bandwidth or over-compression of the data transmission (or both?). This also matches with my test result.
If I am using the 818pro (it is pending for repair), I will surely bring the HS-12W around. Otherwise, I will just stick with my wired adapter + Sony headset.
possible sol guys.
what is that ?
'' MSFP AKU 2.0 ''
it looks like a guy in another forum did an upgrade with this and got a superior sound etc...?
??? :arrow:
Re: possible sol guys.
goldsaint said:
what is that ?
'' MSFP AKU 2.0 ''
it looks like a guy in another forum did an upgrade with this and got a superior sound etc...?
??? :arrow:
Click to expand...
Click to collapse
AKU 2.0 comes with support for A2DP.
In the case for XDA Atom, A2DP was supported on the day O2 released Atom.
A2DP quality in Atom was poor regardless of the Rom version, I tried the following roms:
1. 20060123B1WWE
2. Xda-Atom-ENG-20060123_Feb2006_.exe
3. R060221N_MN1ARC_RS00045
4. DSUU_ARC_C060414WWE_R060327N_EX0016__test_only_not_for_sale
5. Xda-Atom-ENG-20060426B1WWE
As described by buruburu, hizzing sound appears when a certain part of a song is played. Turning On/Off the equalizer doesn't seem to have any effect.
When listening the same song using wired headset, the quality was good, so can't be the problem of the song I am listening.
When listening the same Song using my PC (BT 1.2 with Widcomm 4.0.1.2800 stack), the quality was good as well.
So, no problem with the song I am listening, no problem with the BT Stereo headset I am using, no problem with the BT version (1.2 in Atom, 1.2 in PC; don't have BT 2.0, so can't tell) I am using, and my BT headset works fine making/receiving phone calls.
Conclusion:
1. the BT stack in Atom has a problem;
2. the audio chipset in Atom was a cheap and lousy one;
3. my Atom has a problem (I am in UK, don't have another Atom to test)
If it's (1), hope someone can fix it!!![/i]
tcmp
forgot to tell u guys : i get good quality cause i dont use crappy windows media player to play my mp3s, i use TCMP for every file i have.
and it works a charm.
the only thing i dont get, is that sometimes during the song play, it stops for a second then go back to it.
wierd :shock:
Re: tcmp
goldsaint said:
forgot to tell u guys : i get good quality cause i dont use crappy windows media player to play my mp3s, i use TCMP for every file i have.
and it works a charm.
the only thing i dont get, is that sometimes during the song play, it stops for a second then go back to it.
wierd :shock:
Click to expand...
Click to collapse
Aha! Finally found this topic. I'm on O² Atom + Jabra BT620s. The headset sound quality is superb stable on pc (5mb limit Bluesoil). On Atom... WM10 sounds too low even volume maxed, the equalizer doesn't work on A2DP. The best is on TCPMP where I can blast the pre-amp to make it louder. The quality is "ok²", hisses are seldom but hiccups exists once or twice in wma/mp3 tracks and too bad headset playback function only work on WM10 not TCPMP. And to click my headset when answering calls, I've to set TCPMP not to play on background, after clicking, I've to increase the headset volume.
Does any of you guys who's using other than Atom experience hiccups on A2DP? And those with Atom other than goldsaint? I don't think it's Jabra's but Atom fault itself. I've only SmallMenuPlus and O²Plus running in background (all startup removed), no battery/space monitors on today and overclocked to constant stable 520Mhz with XCPUScalar on the latest firmware. Thank you...
Am using I-Tech Clip S with my ATOM and sound quality is EXcellent!!! No hissing sound at all.
I highly recommend taking a look at the following,
http://forum.xda-developers.com/viewtopic.php?t=54621
I had the same complaint, but these registry edits cleared up my quality problems almost entirely.
Tweaked the bitpool settings to 53 but did not recognize any improvement. The other 2 tweaks is useless for me-- whenever i used my I-Tech Clip S BT headset/wireless stereo, can't hear the other callers voice. Streaming audio to my Clip-S is OK but no noticeable difference.
Cheers
I've tried my two bluetooth stereo headset on HP-2210 , DOPOD 818Pro and O2 Atom,one thing is certain,the sound qulilaty in O2 Atom is worst and poor.I consider the problem is ROM Firmware.
Some of the tweaks cause more harm than good
I removed all traces of these tweaks by doing a hard-reset, and my bt stereo is just fine with the occassional break. 8)
IMHO we should not just apply every tweak just because someone posted :twisted: EG some one claims he installed Atom Exec ROM on regular Atom Now he has vamoosed when asked to share. Some one posted a 4-letter word due to the mess he had when he followed that line :twisted:
Not to go against the current trend, but I entered the following into the reg editor and it made a huge improved in the sound quality using the Samsung SBH-100 headphones.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Bluetooth\A2DP\Settings]
"BitPool"=dword:00000053
"SampleRate"=dword:00044100
Still get the occasional skip but fingers crossed something will come up to fix this soon.
The quality of music with A2DP is really bad, have much better sound with my qtek s110 with a2dp hack. I have been using the same sony ericsson ds970. Is there anything that can be done about it?
perhaps you can follow the instruction to turn on the stereo, then the sound will be better.
This is my experience to. I had a SE m600i before and the sound was way much better on that device.
The sound clearly suckes with the headset that is packet with the P3600.
The sound on the S100 was far more better.
Lets just hope the ATi chip get's activated on the rom-update, so that the Graphics and Sound get better.
guys, could you please be more specific? what exactly made you unhappy about the sound produced by HTC Trinity?
please define the problem. is it too soft, too loud, lacking bass or higher frequencies, choppy, etc, etc????
P.S. forget about stock standard wired headset supplied with your Trinity. it's bad.
Azamat said:
The sound clearly suckes with the headset that is packet with the P3600.
The sound on the S100 was far more better.
Lets just hope the ATi chip get's activated on the rom-update, so that the Graphics and Sound get better.
Click to expand...
Click to collapse
ATI chip?
Guys try using the Hermes Registry Tweaker
I used the hermes registry tweaker to take BT Stereo sound from "Okay" to "Excellent" the tool has five levels of quality as well a tweak to enable true stereo rather than joint stereo.
It worked for me! You can unlock and mount EXTrom too.
http://www.theunwired.net/?itemid=3311
It has a desturbing sound on the higher tones and the bas is muffled. I tried the fit4 program and changed to the best quality, it sounded a little bit better but it was hard to hear, beacuse now the music skips even more thnat earlier. You know you ger music for a while, it cuts of for a second and then comes back. Now it does this every 5 seconds.
CutePinkSox said:
I used the hermes registry tweaker to take BT Stereo sound from "Okay" to "Excellent" the tool has five levels of quality as well a tweak to enable true stereo rather than joint stereo.
It worked for me! You can unlock and mount EXTrom too.
http://www.theunwired.net/?itemid=3311
Click to expand...
Click to collapse
just tested it here. seems to work. The setting was on LOW on my trinity.
I also tried to turn on the GPS settings, which turned on a nice little menu for configuration of the GPS. Looks promising if this is what we get
does not look like the settings gets any gps functionality to be activated besides the settings.
Excellent
Made a big diference on mine too! Nice to know it worked for you.
Try this to disable joint stereo so you get REAL stereo sound, then you will see the difference.
..now the music skips even more thnat earlier. You know you ger music for a while, it cuts of for a second and then comes back. Now it does this every 5 seconds.
Click to expand...
Click to collapse
please see this thread for details. There are good chances for this little gem to work on Trinity as well.
http://forum.xda-developers.com/showthread.php?t=284974
you guys might also want to check out the effort made to port the WIDCOMM stack onto the hermes (to replace the microsoft BT stack). the widcomm stack is superioir and the testers so far have indicated that sound on a2dp is great. the hermes and trinity are basically the same... so it might work.
the development thread is here http://forum.xda-developers.com/showthread.php?t=285419&highlight=widcomm+development
also consider a donation if you like here:
http://forum.xda-developers.com/showthread.php?t=284329&highlight=100+users
Last time I tried the Widcomm stack the stack started well, but I couldn't see any bluetooth device. The blue-led did not flash either.
Can't find any bluetooth device.
adewidt said:
Last time I tried the Widcomm stack the stack started well, but I couldn't see any bluetooth device. The blue-led did not flash either.
Click to expand...
Click to collapse
Same here ....
3D surround configuration
On page 78 of Trinity's manual there is an instruction to set the 3D surround configuration at the headset by going to
Start> Settings > Personal > 3D Surround Sound
and enabling surround sound + setting levels.
I simply can't find the "3D surround sound" selection at >Personal tab...
Can someone help me to configure (eventually by using some registry configuration) how to make this command to appear?
Seems to me this could help to improve stereo quality at P3600...
low volume on p3600i
SecureGSM said:
guys, could you please be more specific? what exactly made you unhappy about the sound produced by HTC Trinity?
please define the problem. is it too soft, too loud, lacking bass or higher frequencies, choppy, etc, etc????
P.S. forget about stock standard wired headset supplied with your Trinity. it's bad.
Click to expand...
Click to collapse
The problem with my new p3600i is that the volume is much too low. With volume control at max setting, I can just hear music in a quiet environment. e.g. an empty room. When there is any background noise, e.g walking along the street, on a train etc, it is almost inaudible. I am mainly listening to classical music, so the dynamic variation is greater than for rock etc., but nevertheless very disappointing.
I am using the supplied headset, but the sound is not loud enough to know what the quality is like.
Are there any setting I haven't found yet? All the talk about changing the ROM sounds like something which might void the warranty
thanks
John
I have used HTC_UseJointStereff.cab and HTweakC, it seems that the sound changes a little, i don't konw which helps, but they help....
Thank you all.
Hi,
I've got the A2DP hack working on my charmer with an i-tech s35 adapter.
The sound is ok but not as good as a wired connection. There seems to be slight high frequency noise.
I've tried the registry fixes with regard to bitpool etc but they don't seem to make a difference.
Could anyone else with a2dp working on their charmer please confirm the quality they are getting.
Could it be that the registry quality settings don't work on a hacked a2dp or could the quality of the wma's have more of an effect whilst using a2dp rather than wired?
Also, the sound is quieter. is there a way to alter this in the registry?
cheers
pjam
pjam said:
Hi,
I've got the A2DP hack working on my charmer with an i-tech s35 adapter.
The sound is ok but not as good as a wired connection. There seems to be slight high frequency noise.
I've tried the registry fixes with regard to bitpool etc but they don't seem to make a difference.
Could anyone else with a2dp working on their charmer please confirm the quality they are getting.
Could it be that the registry quality settings don't work on a hacked a2dp or could the quality of the wma's have more of an effect whilst using a2dp rather than wired?
Also, the sound is quieter. is there a way to alter this in the registry?
cheers
pjam
Click to expand...
Click to collapse
I am also using A2DP hack on my charmer and on my prophet with motorola HT-820,
and you are right abut the sound quality.
it is definitely not as good as wired connection,
it is quieter, and it is have a kind of metalic sound in high frequency.
but i have tried using my friend's HP stereo headset for a while,
and the sound was a lot better.
can you tell me what registry settings do you changed in your charmer?
thanks.
Hi,
I tried the stuff posted here:
http://forum.xda-developers.com/archive/index.php/t-269638.html
I'm in the process of trying a different player that allows me to mess with the equalizer settings. (I can't get TCPMP equalizer to work and WMP10 obviously doesn't have one)
pjam
pjam said:
Hi,
I tried the stuff posted here:
http://forum.xda-developers.com/archive/index.php/t-269638.html
I'm in the process of trying a different player that allows me to mess with the equalizer settings. (I can't get TCPMP equalizer to work and WMP10 obviously doesn't have one)
pjam
Click to expand...
Click to collapse
you can try PocketMusic. google it.
pjam said:
Hi,
I tried the stuff posted here:
http://forum.xda-developers.com/archive/index.php/t-269638.html
pjam
Click to expand...
Click to collapse
thanks man, this registry settings improved the sound qualty.
its not perfect, but its definitely an improvment.
thanks again.
shay.
No problem,
out of interest, what bit rate and format are your music files?
cheers
pjam
pjam said:
No problem,
out of interest, what bit rate and format are your music files?
cheers
pjam
Click to expand...
Click to collapse
I use MP3 with bitrate from 96KBPS to 320KBPS (depend what song).
I found that the default A2DP setting in Athena is used JointStereo,
After I use Registry Editor change JointStereo value to normal stereo the sound quality is become poor,
many high frequence tone in my I-tech Radio (I-tech R35 with radio function),
but this problem haven't appear on jointstereo.
I don't know why HTC use jointstereo than normal stereo there may be some reason was hidden.
simdao said:
I found that the default A2DP setting in Athena is used JointStereo,
After I use Registry Editor change JointStereo value to normal stereo the sound quality is become poor,
many high frequence tone in my I-tech Radio (I-tech R35 with radio function),
but this problem haven't appear on jointstereo.
I don't know why HTC use jointstereo than normal stereo there may be some reason was hidden.
Click to expand...
Click to collapse
Hello seems to be a recuring problem of all HTC phone
just see threads of hermes, P3600, etc
with my Artemis i have the same problem, i try to change joint stereo or bitpool and i get very very poor sound
so i resigned to let the HTC setting , it make poor sound but "earable"
so the question is : why ???
in artemis i forget it because of the 180mhz poor processor (remenber htc didn't activate A2DP in prophet because off it)
but i was expecting that X7500 work great with A2DP blutooth !!!!
what the hell are doing the htc's technical team ???
i can't beleve that !!!
i think that this time i'll pass the X7500 and go to ETEN or ASUS
regards
What is sound quality of normal wired headphones?
schoofter said:
What is sound quality of normal wired headphones?
Click to expand...
Click to collapse
it's more depend on what headphone you use, and because of this, i am pretty sure my DOPOD U1000 generate the greatest sound i won't go in details of this, because this is a PDA forum not a headphone one
Great A2DP Quality!
I agree with Wu, the audio quality of the A2DP is amazing, the best I have experienced using Bluetooth A2DP, plus the distance I can have between the headphones and the Dopod U1000 is even better!
I am using Motorola's HT820! Great sound!
bogusiano said:
I agree with Wu, the audio quality of the A2DP is amazing, the best I have experienced using Bluetooth A2DP, plus the distance I can have between the headphones and the Dopod U1000 is even better!
I am using Motorola's HT820! Great sound!
Click to expand...
Click to collapse
Agree 100% .
I don't thing U1000 provide great sound quality! I try same headset (I-tech Radio + Shure 4G) on different A2DP device Asus535, O2 Zinc, G-Smart i+, Dopod900 and Dopod U1000. Only HTC device have high frequence tone distributed to A2DP headset. Other device provided a stable and great sound quality on A2DP.
it brilliant with my nokia hs-12w
simdao said:
I don't thing U1000 provide great sound quality! I try same headset (I-tech Radio + Shure 4G) on different A2DP device Asus535, O2 Zinc, G-Smart i+, Dopod900 and Dopod U1000. Only HTC device have high frequence tone distributed to A2DP headset. Other device provided a stable and great sound quality on A2DP.
Click to expand...
Click to collapse
if you have shure 4G, then don't use the bluetooth, plug your headphone straight into the socket, otherwise you will waste the headphone.
For everyone else, unless you really like the idea of having bluetooth headphone, otherwise to archive maximun sounf quality, you should plug your headphone straight into the Athena
I am trying Touch HD with a Jabra 620s, A2DP (stereo headset profile), but I suffer occasional music skips.
I have read numerous thread about this problem, and habitual registery fixes like Priority256 etc.. doesnot seems to work with Touch HD.
With Bitpool=30 I have no skip, but sound is awful.
With Bitpool=40 I begin to skip. JOINEDSTEREO=1 helps a little.
I have not tried all Bitpool values below 40 (painful, softreset etc..) but Bitpool=40 is minimum quality IMO.
I tweaked Priority256 (/HKLM/Drivers/BuiltIn/BtA2dpSnd) down to 1, with not much improvement.
I noticed also turning Wifi off helps, but it is no sufficient.
Does anyone of you use A2DP ? Do you have problems ? Thanks for your help.
i use it with the Sony Ericsson DS980 and i dont have any problems at all.. the only thing i notice is that the screen turns on every time i change the song.. any way to get rid of that? want to save battery lol.. ..
I get skips too. Haven't figured a solution yet.
I'm using Moto S9 stereo BT headset, I have the same problem......
And I noticed, when I start play music, and press the powerbutton make the HD enter the blackscreen mode, the quality is good, and music play very smooth, but if I press powerbutton again make the HD back to normal status, and screen on, big stutter occured, and after some seconds BT lost connect with HD......
It's a little outdated, however have you used Sleuth's A2DP fix?
i always got skips with a jabrabt620s and a trinity...well you can minimize it - but never get totally rid of the problem....this is an A2DP limitation, sensitive to EMI like wifi etc.
My suggestion: go to wires...
Skipping?
I've been using a Votager 855 A2DP headset for 6 or so months with Pocket player. It's an excellent application, complete with A2DP compliant equalizer.
I listen to head banging music, but it never skips...but maybe it does and I just don't notice between the bangs.
In another forum several months ago a person or two took up my suggestion on the PP app, and had good results with a stereo BT headset.
kareem9nba said:
It's a little outdated, however have you used Sleuth's A2DP fix?
Click to expand...
Click to collapse
I've seen it, but not installed it for two reasons :
1) It isn't validated for WM6 nor for Touch HD
2) It seems to eat CPU time too much, according to certain posts
Thanks for the tips anyways. If someone more daring than me installs it on Touch HD, keeps up informed.
pzucchel said:
i always got skips with a jabrabt620s and a trinity...well you can minimize it - but never get totally rid of the problem....this is an A2DP limitation, sensitive to EMI like wifi etc.
My suggestion: go to wires...
Click to expand...
Click to collapse
A lot of people have problems with A2DP, but a lot too have none. I'm pretty sure problem comes from poor BT stack, not A2DP technology itself or BT broadcast / EMI problems. I've almost the same skipping rate with my headset 30cm from my HD, than 5 or 8m from my HD.
Your suggestion is wise, but I'm eager to make my Christmas present functionnal..
audscott said:
I've been using a Votager 855 A2DP headset for 6 or so months with Pocket player. It's an excellent application, complete with A2DP compliant equalizer.
I listen to head banging music, but it never skips...but maybe it does and I just don't notice between the bangs.
In another forum several months ago a person or two took up my suggestion on the PP app, and had good results with a stereo BT headset.
Click to expand...
Click to collapse
I've just downloaded it and tryied it. For now, no skip at all !!! (with BitPool=42) This application seems to be very optimized for A2DP.
I keep you informed in this thread if this resolves my issue. I want to increase Bitpool to 50 or more to have optimal quality (I listen classical), and I hope PP will handle this datarate.
Thanks for this excellent advice audscott.
tyronne1126 said:
i use it with the Sony Ericsson DS980 and i dont have any problems at all.. the only thing i notice is that the screen turns on every time i change the song.. any way to get rid of that? want to save battery lol.. ..
Click to expand...
Click to collapse
I also have had no problems using the HBH-DS980 except that I too can't get it to stay in 'standby mode'.
I started a thread on this exact same issue, but have had no joy up until now.
http://forum.xda-developers.com/showthread.php?t=462376
Any help or pointers in the right direction would be greatly appreciated.
Cheers.
Mav.
dear all,
i remember searching up for ad2p anti-skip quite a few months back.
my conclusion was the following settings:
jointstereo -> turn on
samplerate -> 48000
remove all bitrate settings
then all should be well.
The previous settings that involves bitrate, priorit256 are meant for wm5 devices.
in wm6.1, most of these are redundant. in my case, the above settings works perfectly on my itech blueband pro. ad2p and avcrp works well with the default player or with wmp.
Where can one find these settings? I have looked high and low!
***Doh! Found them... HD Tweak is my friend!***
ruffruff said:
dear all,
i remember searching up for ad2p anti-skip quite a few months back.
my conclusion was the following settings:
jointstereo -> turn on
samplerate -> 48000
remove all bitrate settings
then all should be well.
The previous settings that involves bitrate, priorit256 are meant for wm5 devices.
in wm6.1, most of these are redundant. in my case, the above settings works perfectly on my itech blueband pro. ad2p and avcrp works well with the default player or with wmp.
Click to expand...
Click to collapse
I also have iTech BlueWhatEver and it works better, but still ones a few minutes sound skips
Also how to prevent phone from waking up from standby when I press pause/ff/rew button? Because it's ****ing annoying, I have to manually turn phone back off, so avcrp is totally useless if I have to touch the phone.
I suggest you lower the bitrate to 44100. 48k is useless since your mp3 are in 44.1kHz and you will save some CPU, bandwith
Jointstereo = 0 is prefered for quality purposes.
Then the bitpool ... this is where it gets tricky because every headset have their own limitations.
When i use it with my sony ericsson HBH-IS800 I can go up to 48.
If I use another device I need to lower it to 40.
The "CPU" of you headset needs to be taken into account.
The touch HD have no difficulties encoding SBC in realtime in high bitrate, the issue comes from the headset itself not able to decode SBC fast enough according to the bitpool you chose.
So there's nothing you can do except trying another BT Stack (that can have better SBC encoding algorithm) or changing you A2DP headset.