I was recently asked to sort out the acoustics in a couple of small meeting rooms that resonated a bit like large telephone boxes (showing my age, remember those, the old red ones?). We used the Rosa Noir panels as they are a broadband panel, combined with the MP700/40 panels on the ceiling. The resonance was greatly improved, even with less than 20% coverage, as both these panels are very efficient and absorb a broad frequency range, a very important consideration in small rooms.