I just did sum shopping, bought a pair of speakers (haven't done that in 10 years..). Then I realized I needed some kind of stands for those, preferably adjustable ones. Hmm they should be heavy to prevent them falling over.. did I say heavy? Well, bricks are heavy.. :)
I used aluminium LCD TV wall stands available from Biltema (what else..) as joints, they should bear a 15 kg weight. Those speakers I bought are pretty lightweight, 5,5 kg each, so that should be no problem.