I was thinking about
RealTraps - Planter Traps .
If i put a big bottle of water (10L) in each corner, would that help?
My reasons for thinking about this:
- i heard that mass helps stop sound, so.. water is pretty heavy, no?
- that foam you use works because it's somehow elastic, it bounces the sound in within, so.. water is pretty elastic right?
- relatively cheaper..
Also think about extending this idea (more than bottles

) .