One point deduction is available for the catch.
The bracket is designed according to the description for speakers to 3.5kg.
My weigh 2kg scarce. And yet it was very nerve-wracking align boxes horizontally.
You have to tighten the screw so tightly that the screw head is completely demolished ... (no idea whether they can be solved yet)
If you do not do this, looking the speaker, slowly but surely, more and more down.
But otherwise top