superchunk / perforated panel in one?
 

I have already put floor to ceiling triangular (600mm) velocity bass traps (rockwool) in the corners of my room

I was wondering. Theoretically, if I seal them on the sides and back and add a perforated panel on the front could it increase their efficiency ?

Tests
 

If they are in corners surely the backs are sealed already?
While some commercial designs appear to have some sort of membrane in front, a GS tested all sorts of cardboard and other fronts for us here.
No measured result.
DD

Just remember that adding a perf panel may (and I stress may) increase efficiency over a certain bandwidth (usually about an octave or two), it will also reduce the bandwidth of overall effectiveness.

The apt analogy is increasing the Q on an EQ.... make sure you know which frequencies you want to target, then make sure you build the perf panel so that it really does target those frequencies.

If it were me I wouldn't bother.....

Honestly unless you have a deep knowledge of working with something like this I would not do it. What you have is working, I bet, so don't mess up a good thing. If you are trying to retain a bit more upper frequencies in the room then cover the fronts with card stock (heavy paper).

thanks for all of your help