I’m the original creator of this thread with an update.

It seems that the sound is absolutely the plastic expanding from heat and making a loud sound. It is not the Wifi, power converters etc. I know this as I unplugged the unit and it still make the sound hours later.

I have gone through 3 units from the first generation to the second. I also heard the store unit do it while I was standing right next to it. In other words 100% or the A9’s I have been around have this problem.

B&O support are totally useless. The stores just offer to replace or repair it. They said they have no idea what to repair though.

It is not the wall mount. Mine has been floor standing from day 1.

This is absolutely a design flaw. Other than that the unit is amazing but the pop sounds are a bit of a blemish on it and B&O’s support team.

I may be zeroing in on the source of the problem with my unit. 

After playing a movie for about two hours (with 1 pop) I turned off the unit and got ready for bed. I had to go back to my living room for something about 15 minutes later. On a whim I went to the side of the A9 and squeezed it a bit with one hand in the front center of the speaker and one hand in the center of the back. It then made the loud plastic pop noise. But instead of it coming from the back or inside of the unit it, as I thought was occurring, it came from the front at approximately the 2 o’clock position. 

So in my case it might be originating from the front upper right where the plastic speaker cover meets the frame? I will continue to try making it pop to further narrow down the location. 

For the record it seems to get worse over time. The first month out of the box it was quiet, it slowly ramped up over the past year and now pops about every 30 min or so.

I agree. It was quiet at first. Now it pops after minutes of use. Still have to take it to my  dealer, to see what they say...

WickedFishstick wrote:

I agree. It was quiet at first. Now it pops after minutes of use. Still have to take it to my  dealer, to see what they say...

My MK1 doesn’t do this, but then I thought it might simply be from ill-fitting plastic parts which are a little too tight, so expand and make the ‘popping’ noise you hear? There won’t be a solution apart from replacing those rear plastic components.

I was advised by B&O that the repair was to loosen the screws for the housing and tighten them again while the unit is warmed up. I did not have the correct hex key on hand to do this over the weekend but will wait for now. I looked at my unit this morning before leaving home and it does have this firmware update. I will report back one way or the other.

Do you have a link to the article or release notes?

I always thought it was hardware related, but i’ll check if this update solved it. 

Thanks for the info!

My unit still makes the plastic popping/creaking noises. The latest firmware did not help.

I will try adjusting the screws while the A9 is warm to see if it relieves some of the pressure which I think is causing the pops.

Same here,

Would you be so kind to let us know if it worked? That would be great!