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Problems with front speaker

I have been having some problems with the front speaker lately. Most of the time when I get an incoming call or make a call no sound comes through the front speaker and have to put the loudspeaker on to hear anything. The weird part is that from time to time it works fine usually after using the wired headphones. Oh an the volume is set to max.
Has anyone else had the same problems? How to fix this? could it be that I changed some settings inadvertantly?

RaulTT said:
I have been having some problems with the front speaker lately. Most of the time when I get an incoming call or make a call no sound comes through the front speaker and have to put the loudspeaker on to hear anything. The weird part is that from time to time it works fine usually after using the wired headphones. Oh an the volume is set to max.
Has anyone else had the same problems? How to fix this? could it be that I changed some settings inadvertantly?
Click to expand...
Click to collapse
Mine did not work at all any more. I even did a hard reset; no change. I have now sent it back to HTC for repairs.
Robin

Same here
Mine doesn't work at all.
Wow, I guess we should start a poll where people would select which problems they are experiencing:
1. Wi-Fi
2. BT
3. Front earphone
4. Radio
5. Bad painting
6. Shutting down suddenly
7. None of the above
More than one could be chosen... That would ballpark the size of the problem. Maybe some production batches were messed up due to the hurry from Qualcomm to deliver the already delayed parts? Maybe HTC came to that point where the brand is far larger than is the company's capacity of growing (especially in terms of QA)...
-Feaps

I have the same problem. The wired is that it ocassionally works. Another problem is that FM not always working. I bought the device in German. But now I'm in China. Any one knows how to fix? I don't know how to disassemble it. But I'm curious, maybe some pin is loose?

Same for me, the front speaker didn't work for 48 hours and then worked again I don't even know how

No sound speaker htc touch
I have the same problem, no sound from de phone, when switching to handsfree mode i hear de caller

Hello,
I have the same problem and found that this happened when starting an application that uses only rear speaker or hands free speaker (e.g. Tom Tom, Compe Pocket, etc.)
And the problem is not of that application, the problem is in the phone application of the cruise. I think that these applications mute or power off the front speaker and the phone application don´t activate it.
I have found a solution to this. When making or receiving a call, press many times speaker or hands free button on display and after many times, speaker works again.
Now, I am looking for a new phone application, in order to quit HTC application. Somebody knows a good phone application to use in Cruise????
Many thanks in advance.

My device has been returned today.
Have not had a chance to test it. Will do so when I get home tonight (in 8 hours). I will let you all know if it has been resolved.
As a remark to fran_mad's post; In my case, even after a FULL HARD reset, the speaker did not work.
I therefore do not think it was caused by a software problem.
Kind regards,
Robin

robincop deel 2 said:
My device has been returned today.
Have not had a chance to test it. Will do so when I get home tonight (in 8 hours). I will let you all know if it has been resolved.
As a remark to fran_mad's post; In my case, even after a FULL HARD reset, the speaker did not work.
I therefore do not think it was caused by a software problem.
Kind regards,
Robin
Click to expand...
Click to collapse
Motherboard has been replaced and all works OK again.
Good and quick service from HTC (free pick-up and delivery within one day)
I am still not sure if I like this one better then my good old sleek, slim and sexy Touch.

no sound from phone speaker
fran_mad's solution did not work for me.
I am affraid it's a hardware thing with me too?
I checked volume, did soft and hard resets (clear storage) but frontside speaker does not work!
HTC technical Support is going to collect my phone tomorrow. I will post my proceedings...

frontside speaker repaired
HTC Techsupport repaired my Touch Cruise within a week. Bravo!
See if it keeps working this time!

Same here. Front speaker started to fail a few times. 1 week later it totally stopped. Was repaired by HTC (EuroTwice.be) in 2 weeks.

Front speaker stopped working after 1 month usage - motherboard replaced by htc within 12 days. But now the device shuts down by itself sometimes - will send it to htc again tomorrow - meanwhile i am very disappointed about my Touch Cruise.
Gerhard

Hi
I have problem with the front speaker.
The sound is "blurry" if i put the caller to rear speaker the sound is crystal clear.
So the problem must be in front speaker??
I search the net but i cant find where to get it?
Is somebody have the front speaker from dead Prophet?
TNX

fran_mad said:
Hello,
I have the same problem and found that this happened when starting an application that uses only rear speaker or hands free speaker (e.g. Tom Tom, Compe Pocket, etc.)
And the problem is not of that application, the problem is in the phone application of the cruise. I think that these applications mute or power off the front speaker and the phone application don´t activate it.
I have found a solution to this. When making or receiving a call, press many times speaker or hands free button on display and after many times, speaker works again.
Now, I am looking for a new phone application, in order to quit HTC application. Somebody knows a good phone application to use in Cruise????
Many thanks in advance.
Click to expand...
Click to collapse
just wanna share with others..
my touch cruise experienced this weird problem since yesterday.i've tried fran_mad's method and and its works!! thanx dude! i'm still figuring why the heck this kind of problem happened as i didnt change any setting on my phone.

Sorry for being clueless but what do you guys mean by "front/rear speakers"? I thought there is only one speaker on the back side of the phone and a universal connector for handsfree - earphones+mic?

There are two speakers, one in front and one on the back. My front speaker died and was repaired by htc - new motherboard. Seems to be a known problem...

Anyone esle have a lpudspeaker pop or click sound when the speaker is used?

When my TP's loudspeaker is activated or deactivated it makes a small speaker pop sound. Is this normal or do I have a faulty unit? It happens jsut before any sound is emitted from it, and then shortly after the sound has finished and it goes back silent. Seems its when the speaker receives power ready to emit sound, then again when it powers back off.
Coming from a Universal (MDA Pro) the sound quality on the TP is very poor in comparison but then it is like half the size so it's manageable. This popping sound is very annoying tho.,
I'm using the stock ROM that came with it. I'm on T-Mob UK (it's one of the Expansys ones).
Any ideas how I come test / overcome / put up with this?
Thanks,
LLOYDY

lloydcody said:
When my TP's loudspeaker is activated or deactivated it makes a small speaker pop sound. Is this normal or do I have a faulty unit? It happens jsut before any sound is emitted from it, and then shortly after the sound has finished and it goes back silent. Seems its when the speaker receives power ready to emit sound, then again when it powers back off.
Coming from a Universal (MDA Pro) the sound quality on the TP is very poor in comparison but then it is like half the size so it's manageable. This popping sound is very annoying tho.,
I'm using the stock ROM that came with it. I'm on T-Mob UK (it's one of the Expansys ones).
Any ideas how I come test / overcome / put up with this?
Thanks,
LLOYDY
Click to expand...
Click to collapse
i got similar prob...sometimes u will hear static sound from the speaker..another encouter?

yup, i get this too.
sometimes when playing music through the loud speaker, the sound stops even though the music is still playing
you also get this?
m

This is my problem:
http://forum.xda-developers.com/showthread.php?t=427160
Am returning to Expansys for an exchange.
LLOYDY

My TP started behaving like this after 2 months of use. First I suspected a software problem, but after a hard reset it was the same, so smells like a hardware problem.. I think I'll contact the local HTC service and see what they have to say about it.

It's been 11 days since I left my TP to a local (authorized HTC) service center; they accepted it as a warranty covered problem and now it's waiting for a new motherboard. The thing that worries me, is that when my previous phone (TyTN; does HTC a have a little quality problem or am I just that unlucky?) underwent the same thing, it took a little over 7 weeks. Without a temporary replacement phone..
I am getting an Xperia X1 from work though, so I don't have to be without a decent phone even if the TP took a while longer.

This happened to me as well. After ROM upgrade my speaker have started to play "cracking sound" and "static noise" (sometimes gsm noise) just after playing something normal (like ring or nitification sound).
Has someone fixed this in other way than replacement? I have no warrant/guarantee any more

Same problem here!
I also have this annoying pop/click sound that recently developed after the very first long phone call I made with my HTC Touch Pro.
(for some reason, I can't link to my other post, so I'll copy the relevant info here).
Speaker (the speaker on the back, not the speaker that you put to your ear) emits a sharp click/pop prior to sound being emitted and a second or two of what is best described as "static" or interference (which is quiet-ish, but noticable if you're in a quiet location), then another sharp click/pop as the speaker effectively shuts itself off.
As well as this, the overall sound level seems quieter than normal (and my HTC TP was never the loudest device to statr with!)
This issue also occurred due to the same reason. I had made a phone call of approx. 45 minutes (the single longest call I'd made on my HTC Touch Pro), after this, the problem started.
I also got the weird battery issue, although the battery issue for me was that the HTC would be switched on and displaying a full charge, however, performing a soft-reset would show only a half-power charge when re-booted. I could then charge again until full, soft-reset again, and the same thing would happen.
Power drain seems about normal. I'm currently waiting for a complete discharge so I can fully recharge and hopefully "correct" the battery meter (I think the battery issue is simply a mis-configured meter reading) however it does seem related to the sound issue, which is far more worrying.
My HTC Touch Pro is bog-standard, everything stock and normal. Settings > Device Information > System shows the following:
Rom Version: 5.05.405.1 WWE
Rom Date: 01/22/09
Radio Version: 1.11.25.01
Protocol Version: 52.58.25.30U
Does anyone one know if this is genuinely a hardware problem that can only be fixed with repair/replacement, or is this an issue that can be solved with software or soft/hard resets etc?
Please help!

I tried everything I can do software so I think it's a hardware problem. In a few days I'm getting another cellphone so I will send my Touch Pro to repair service. I'll let you know the result

Davka said:
I tried everything I can do software so I think it's a hardware problem. In a few days I'm getting another cellphone so I will send my Touch Pro to repair service. I'll let you know the result
Click to expand...
Click to collapse
Thanks for your reply, Davka.
I'm starting to think this is definitely a hardware issue. I have since tried multiple hard-resets (that didn't work) and since I was loosing my setting with the hard-reset, I thought "what the hell" and flashed TAEL-ROM and re-flashed the radio (same version). Neither had any effect on my loudspeaker (ie. it's still clicking and popping with interference before and after any sound as well as being annoyingly quieter), but I am loving TAEL-ROM, though!
Please keep us informed as to the outcome of your speaker problems! Thanks again!

Same problem
I have a touch pro. And I have exactly the same "clicking" sound from my speaker when it gets activated and then a click after it's deactivated.
It's Click, play sound, Click.
I don't think it has to do with the hardware. I got it after flashing the newest NRG rom.
Gonna flash back to an older rom to test.

billybiro said:
Thanks for your reply, Davka.
I'm starting to think this is definitely a hardware issue. I have since tried multiple hard-resets (that didn't work) and since I was loosing my setting with the hard-reset, I thought "what the hell" and flashed TAEL-ROM and re-flashed the radio (same version). Neither had any effect on my loudspeaker (ie. it's still clicking and popping with interference before and after any sound as well as being annoyingly quieter), but I am loving TAEL-ROM, though!
Please keep us informed as to the outcome of your speaker problems! Thanks again!
Click to expand...
Click to collapse
I have the same problem . You have found a solution for this problem?

In my case it was probably a powering subsystem issue and HTC service found some fluid inside my phone, cease my guarranty and didn't fix it :/

XDA Serra - problem with speaker

Hi,
Finally I've managed to get one of those phones - as a replacement for my Exec (best phone EVER! IMHO) and here I am!
I really want to change ROM ASAP but I might have a problem with hardware so want to check that first before doing HardSPL
- is your speaker really quiet? To the point that you can't hear TT/hands free?
- while playing teeter does your back cover gets hot? (in area of the speaker, battery is cold)
- sometimes no sound while playing teeter (possibly other games but haven't tested that yet)
- can you hear "gsm noise" every so often from that speaker? (don't know how to describe it, basically same noise as from other speakers when phone is connecting to the GSM BTS)
I'm still using Official UK O2 rom
many thanks for your help!
Cheers
Chris

XDA Serra
Hello!
columb, I have had my XDA Serra for just over a month now, with changing of the ROM, I'm not sure if its entirely necessary unless you need the standard one for a particular reason! I do recommend downloading the youtube App and quick gps patch from o2 if you want to use gps. I use copilot live 7 and its really good, fab phone! I upgraded from a XDA II so quite a jump, similar to the exec not quite as good tho!
With regard to your problems, I'v checked these with my friend who has a HTC Touch Diamond, (the non o2 keyboard-less version) and his is the same.
- My speaker is not the loudest in the world but still very audible
- The phone gets warm on the back when doing anything intensive, not to surprising considering the processing power/graphics of the phone, and after combing the manual found that o2 say that it is completely normal, just warm not hot.
- I always get sound with teeter unless system volume turned down ( obviously) so not sure about that one (be aware system volume is still separate to ring volume as on previous windows mobile)
- I don't get any GSM interference with the phones internal audio on any channel, not sure about that one again. There may be problem with your internal speaker.
The O2 rom isn't that bad, I'v compared it with the HTC rom seems to be just as responsive, if perhaps not quite as good looking.
Hope thats been some help!
Regards
Ed
Compaq Ipaq
XDA II
XDA Serra

I am also using Serra.
speaker is not loud but it is acceptable for TT with voice.
try search "audioparam3.csv" in the forum you may get louder volume.
And I saw a thread in the forum cut backcover of the phone to make it louder and sweeter.
EXEC has two (or three?) speakers and it is very chunky so it has excellent stereo sound quality. However I couldn't imagine how to use it as a phone. It looks like a laptop or a brick.
I feel that most customized ROMs here are better than O2 one and you can always burn it back to original ROM anyway.
backcover does hot sometimes. I guess that is RF Radio module near tweeter area

Same problem
not sure if it helps but i have exactly the same ploblem with my phone.
the digitiser stopped being reponsive so i took mine in for repair. o2 took a month to fix it they did a half asses job and put in a new digitiser bur left the glass laminate which is coming un laminated and has a washing up liquid effect in the middle of the screen.
anyway when they repaired it they also upgraded the software' last night i had to make a call in the car' not having paired it yet with the bluetooth stereo i used the loud speaker. after 10 seconds or so it all went quite. i toggled loud speaker off and on again. it came back for a few seconds and went again.
i also get pops from the speaker occasionally and can here the same gsm noises at the end of calls.
the phone never did it before the rma and software upgrade so its going back.
just thought i would let you know its not just you.
i think some of the earlier hardware has an issue with the latest O2 rom.

Headset bluetooth connection problem

Hi friends, i bought yesterday a bluetooth samsung hm1500 headset (2.1 bt + edr)
http://www.mytrendyphone.com/shop/samsung-hm1500-bluetooth-27371p.html
and i can't connect with tg01. The phone cannot detect it. I tried everything for hours , tried with all available roms but still nothing.
Can anyone help please ?

Use the traditional problem solving procedure
1) Test your new headset with another phone (friend, relative....)
2) Test your TG01 with another Bluetooth device
Good luck! Tell us the results

Motorola are the best
Bluetooth headphones are real fussy. Motorola's pretty much work with everything I've found.

Thanks friends for the replies, i send it back, doa, i tried with 3 other mobile phones and nothing with noone conected only with my laptop was possible to connect, very special bluetooth.

Has anyone found a bluetooth headset that one can have a decent conversation with others without having problems of not being heard loudly? I have two headsets, a cheap ebay hong-kong one and a Nokia BH-215. People complain hearing me very low with both. If i get away from the phone but within the bt radius things get even worse and don't get better even if i get close to the phone again. I think it's because of the phone and not the headset.

Did you try SRS 3 cabs install?

No but i used it once and i remeber that it messed up my bt connection. But that was back in 6.5.x rom. Maybe i''l give it a shot now that i'm on 6.1.

Jonous said:
Has anyone found a bluetooth headset that one can have a decent conversation with others without having problems of not being heard loudly? I have two headsets, a cheap ebay hong-kong one and a Nokia BH-215. People complain hearing me very low with both. If i get away from the phone but within the bt radius things get even worse and don't get better even if i get close to the phone again. I think it's because of the phone and not the headset.
Click to expand...
Click to collapse
I am using a Sony Ericsson MW600 (includes FM radio as a bonus) and is fine.

kevinpwhite said:
I am using a Sony Ericsson MW600 (includes FM radio as a bonus) and is fine.
Click to expand...
Click to collapse
Thanks for the info Kevin

kevinpwhite said:
I am using a Sony Ericsson MW600 (includes FM radio as a bonus) and is fine.
Click to expand...
Click to collapse
Kevin i bought one but still connection tends to lose sound quality with too much "noise garbage" in it. Can you tell me with which radio have you been using it with? Is it the 1600 of the rom in your signature?
Thanx

Jonous said:
Kevin i bought one but still connection tends to lose sound quality with too much "noise garbage" in it. Can you tell me with which radio have you been using it with? Is it the 1600 of the rom in your signature?
Thanx
Click to expand...
Click to collapse
Hi Jonous,
I'm using it with the other radio - what was effectively the 'Italian' stock radio 0300.76
It's difficult to compare notes with this sort of thing remotely... but I'd confrm that there is 'some' degree of background noise present even on this high-end BT headset device when compared direct to a hard wired uUSB connection (into the same earphones - per my sig). Like any audio device, I'd recommend keeping the volume level on any element in the chain to < 60% in order to keep noise down.
DEspite the above, I'd regard the MW600 as a quite capable piece of kit in conjunction with the TG01 giving extra flexibility - but it is a trade-off to some extent with quality.

kevinpwhite said:
Hi Jonous,
I'm using it with the other radio - what was effectively the 'Italian' stock radio 0300.76
It's difficult to compare notes with this sort of thing remotely... but I'd confrm that there is 'some' degree of background noise present even on this high-end BT headset device when compared direct to a hard wired uUSB connection (into the same earphones - per my sig). Like any audio device, I'd recommend keeping the volume level on any element in the chain to < 60% in order to keep noise down.
DEspite the above, I'd regard the MW600 as a quite capable piece of kit in conjunction with the TG01 giving extra flexibility - but it is a trade-off to some extent with quality.
Click to expand...
Click to collapse
Hehe i feel like an idiot, i enbarked on an endless journey of flashing and flashing different radios and trying out the sound quality of each one cause bt headset is very important for me. When i got to 0300.76 suddenly sound was crystal clear! On the 1st test call. On the second call i was bearly heard, crappy sound again. Then it it struck to me...I remembered that sometimes when you press the answer call button of the headset the sound is transfered to the phone...I thought "no it can't be...if this is it i'm a real idiot!!!" And yes, when i pressed the button again sound was transfered to the headset and sound was magnificent! So the lousy sound i got with all other roms was because i was trying to be heard through the phone's micrphone which was some 2-3 away from me hahaha so other end of line heard little or nothing.
Well enough said, this headset is brilliant, loud n clear sound, caller id, fm radio everything! well almost, i wish it had vibration too but don't care, i'm happy with my buy! Thanks again

Jonous said:
.....Well enough said, this headset is brilliant, loud n clear sound, caller id, fm radio everything! well almost, i wish it had vibration too but don't care, i'm happy with my buy! Thanks again
Click to expand...
Click to collapse
You are most welcome - I'm delighted you are up and running and happy with the S-E MW600 headset. There are so many variables with these things as well as the subjective element wjhen it comes to perceived audio quality that it is difficult to translate one person's experience to another. Great news

the Sony MW600 is really great !
But don´t forget to increase the bitrate of the streaming codec.
I modified/added this values in HLKM\Software\Microsoft\Bluetooth\A2DP\Settings
BitPool 65
MinSupportedBitPool 65
MaxSupportedBitpool 65
SampleRate 48000
SubBands 8
Blocks 16
Allocation 1
UseJointStereo 1
Unfortunately Track names are not submitted like with SE or some HTC phones

Hi Friends!!!
I have also the same problem with a BT car.
And the problem is like it´s been described (sound very loud in the microphone)....
I remember that in my I780, I changed some settings (don´t remember if it was in Hardware or registry).
Anyone had a solution?

Nexus 5: Making-Receiving calls (Microphone and Speaker) problem

Hi Guys -
Black Nexus 5. It has been great in everything except placing and receiving calls. I don't use a headset just the phone directly. But whenever I call someone, people tell me that they can barely hear me. To fix that I literally have to move my mouth right next to the microphone and even then the voice is barely ok. I almost have to shout. People tell me that I sounded much louder on my own phone.
Also while hearing people on the phone the voice is too low. I use the volume control app and have the IN CALL volume on FULL. 5/5. Still I barely hear the other person and if it's noisy outside I cannot. Contrast to my previous phone in which I had to go down to 50% volume otherwise it was too loud.
Is this a defective unit? A hardware issue? Do I need to ask Google for replacement? I am loath to do that since the phone has been amazing in everything else. It's fast as hell and the battery life is super.
I wanted to know if any one has the same problem and whether it might be fixed with a software update or is it just a hardware issue and something wrong with my phone?
Thanks in advance.

Idem for me !
Hi,
I've the same problem with my Nexus 5. I think that it's a software problem because, when I put the speaker on, the problem is resolved. I think that it's due to 2 microphones and noise cancelation... Our voice is canceled ! I hope that Google is awared of that problem and will delivered a fix quickely. Specially that there is another problem with speaker that sometimes sizzles a lot ! I think that i'm going to buy a headset in the meantime. That's really a shame : a new phone that we cannot use to phone ! Even if yes for the other thinks Nexus 5 is great.
Are they other people that are the same problem ? How can we open a case in Google ? How they know that there is really something to fix ?
Thanks,
imjimmy said:
Hi Guys -
Black Nexus 5. It has been great in everything except placing and receiving calls. I don't use a headset just the phone directly. But whenever I call someone, people tell me that they can barely hear me. To fix that I literally have to move my mouth right next to the microphone and even then the voice is barely ok. I almost have to shout. People tell me that I sounded much louder on my own phone.
Also while hearing people on the phone the voice is too low. I use the volume control app and have the IN CALL volume on FULL. 5/5. Still I barely hear the other person and if it's noisy outside I cannot. Contrast to my previous phone in which I had to go down to 50% volume otherwise it was too loud.
Is this a defective unit? A hardware issue? Do I need to ask Google for replacement? I am loath to do that since the phone has been amazing in everything else. It's fast as hell and the battery life is super.
I wanted to know if any one has the same problem and whether it might be fixed with a software update or is it just a hardware issue and something wrong with my phone?
Thanks in advance.
Click to expand...
Click to collapse

imjimmy said:
Hi Guys -
Black Nexus 5. It has been great in everything except placing and receiving calls. I don't use a headset just the phone directly. But whenever I call someone, people tell me that they can barely hear me. To fix that I literally have to move my mouth right next to the microphone and even then the voice is barely ok. I almost have to shout. People tell me that I sounded much louder on my own phone.
Also while hearing people on the phone the voice is too low. I use the volume control app and have the IN CALL volume on FULL. 5/5. Still I barely hear the other person and if it's noisy outside I cannot. Contrast to my previous phone in which I had to go down to 50% volume otherwise it was too loud.
Is this a defective unit? A hardware issue? Do I need to ask Google for replacement? I am loath to do that since the phone has been amazing in everything else. It's fast as hell and the battery life is super.
I wanted to know if any one has the same problem and whether it might be fixed with a software update or is it just a hardware issue and something wrong with my phone?
Thanks in advance.
Click to expand...
Click to collapse
Did you ask for an RMA? If so, what is the status?
I have the same issue and google has promised an RMA.
Its quite a pain not to have a phone for a week.

shrek8421 said:
Did you ask for an RMA? If so, what is the status?
I have the same issue and google has promised an RMA.
Its quite a pain not to have a phone for a week.
Click to expand...
Click to collapse
I don't think a replacement will help.
There are several other threads already
http://forum.xda-developers.com/showthread.php?t=2518840

exactly the same here... already some news what to do?

This issue seems to have become worse with the 4.2.2 update. The in-call volume is very very low. It's impossible for me to hear other people unless I am in a quiet room (the volume is maxed out). I recall with the stock 4.4.0 - the call volume was not that low.
For whatever reason, using a headset everything is fine. So for phone calls, Nexus 5 is only usable if I use a headset. It's impossible with the earpiece.
Anyone else having a problem with low in call volume? I'm wondering whether it's my specific phone. Everything else is perfect, and the battery life is insanely good. Wondering whether I should RMA.

I too am having this problem. It wasn't like this before the update but outside I can barely hear the other side. I don't make a lot of calls tbh but I remember shortly after I bought it making a call to another N5 and thinking how great it sounded.
Now it's hard to use.

I am having the same issue some days back. They Have replaced with new one..No issues so far..
Sent from my Nexus 5 using Tapatalk

Elemetrix said:
I too am having this problem. It wasn't like this before the update but outside I can barely hear the other side. I don't make a lot of calls tbh but I remember shortly after I bought it making a call to another N5 and thinking how great it sounded.
Now it's hard to use.
Click to expand...
Click to collapse
Hi - did you do anything. I am wondering whether RMA helps in such a case.

I haven't done anything with mine yet I was hoping to compare it to a friends N5 first.
I might try and contact Google.
Sent from my Nexus 5 using Tapatalk