Sirrah diffuser/absorber

Four pieces Sirrah diffuser/absorber available from R.T.F.S Raumakustik. (Germany)
These Sirrahs work very effectively in counteracting flutter echoes within the living room, listening room or man cave. They also prevent all kinds of not fine reflections on the back wall, side wall or opposite wall.
These are beautiful gray and/or white exam papers!
Now: 279.90 p piece