Compare the series

How much sound each absorbs, the sizes it comes in, and where it starts.

NRC: how much sound a surface absorbs, averaged across the range of the voice; higher absorbs more. Lab-tested: Surge Pro and Wave at National Taiwan Ocean University, the Art Series at National Taiwan University, both to ASTM C423-22. Measured: Massform office REW measurement. Calculated or estimated: not measured, and each product page says how. Solid bars are lab-tested or measured, striped bars calculated or estimated. With Basstrap: a Basstrap Pro behind each panel, sold separately, from $199.