I have dual HSU VTF3 MK5's
In this picture you can see a bookshelf in corner, flat against wall.
This morning I simply angled it in that same corner. So there's basically a triangle of dead space behind it. As you can see it's pretty much ful of books.
I moved it to angle out solely because I thought it would look better, and it did.
But what's crazy is I think it affected the bass response in room, mid bass sounds fuller.
So is that in my head or does a bookshelf basically work as a bass trap if angled in corner? If so I'm def getting another for other corner and im surprised more people don't recommend this. It's much higher on the WAF scale too!