Hello, I have problem on my Superb (2015 year) with canton surround sistem. 

Subwoofer does not work all time, sometimes when I hit hole on road it work some time and then again nothing, does anyone have any tip how to solve the problem, I assume that probably bad wiring cause the problem. Thanks! 

Solved! 

The bass speaker in the woofer box was the problem, the wire was bearly hanging connected, just little bit cleaning and reconnecting again... 

Kako ste otvorili sub? Ja imam isti problem al mi je sub na levoj strani u koferu pokriven sa plastikom in nemogu da otvorim nikako

@KaraS3 , how can I remove the subwoofer from where it is installed. I just can't find a way to do it...

@Sikas if you have same one as i posted  on picture than you have to open whole side of the booth, because screaws are behind it. I took it to skoda service guys, payed 20 eur 

Hello, you need first to remove “carpet” around the sub, then you will get access to the screws behind the subwoofer, it’s not complicated to do if you have any skills.

Before start take out rear panel and floor carpet.

1. 2 screws at the each side of the plastic trim, then pull up.

2. 2 screws behind the bag holder and also remove wire for seat folder.

3. Pull out the side roof panel (can’t be seen on pic) 

4. Just above the number 4 on the pic you can see two bag holders on the bottom of them you pull out “flat hook” and then you are able to remove holders

5. under the cover of the sub you will see couple of screws in the floor.
After that you are able to reach the screws behind the sub and you can take it out. 
P.S. I wrote this on memory so just have that in mind! 
Hope it helps! 

Thank you for the answers guys.  It's a starting point .   

@KaraS3Do I need to remove the rear seat to access the speaker?

@JaimeetNo, you can just fold them, no need to remove