I was thinking about different wood density too, but we're talking about the size of two soda cans of water. The speakers seem to have been stored in a dry place.

Try weighing them without the stands - they look to be made of cast metal and judging by the photos, they are not 100% identical. 

/Dennis

Thanks for the input, tried weighing them this morning without stands. Now they differ 0.8kg, 12kg vs 12.8kg. 

When I lifted them this morning, I noticed the extra weight below the tweeter. I will check them one more time this evening when I get home. I expect to be a goldbar in there. 😎

To be continued...

Well... No gold bar, but at least nothing else either. Only difference I've noticed, is that the isolation of box 1 is grey and box 2 more kind of red.

Complete emptied of isolation they were still 12 vs 12,8kg.

Looking at the wooden panels, box 1 got more knacks/knobs (what's the English word?) than box 2.

But could this wood density really make a difference of 0.8kg?!

I think I just should except this case.

Kind regards,

Simon