Yeah, these are meant more for office type situations. The coefficient of 0,9 means it absorbs 90% at 2000 hz. This is mostly the high midrange and voice area. It's meant to cut down slap echo and voice/noise in the office area. The other frequencies at 0,6 or less are actually a very poor acoustic panel for audio room purposes. You're better off looking at GIK Acoustics impression or art series:
The Impression panels will reflect some of the mids/highs since they have a cut wood panel front.