The echo-mitigating Frequency range of this panel design :

Echo-mitigating frequency range:   830 – 2860 Hz   (design-dependent)

Material : Spruce          Size : 120 x 120 cm
Weight, as mounted on wall : 65 kg
Assembled from 4 equal (symmetric) units.

Possible to have the panel mobile, with a stand on wheels.

See exposition, video, from TaloTalo in Vantaa Finland in March 2017.