It’s well established that it is a fake. It’s well constructed as everything sits pretty well together with only 8 screws. From that I’ve seen, the original speaker has many many more screws.
So, the logic board is quite different from the original and it has 2 speakers instead of four. I recommend you look at this video to see how the original inside looks like: LINK
Now look on how the Chinese JBL looks on the inside:
If you want to upgrade it, have a look here: LINK