My room is really quite live and this is one of the steps I'm taking to controlling the acoustics there.
Very good, although the hanging of the panels was a pain.
Then again, I hate any ceiling work!
There is an absorption coefficient chart included which I feel really should be on the product's webpage too, in the name of helping the customer make as informed a choice as possible.
However I have other T Akustik PET products too so I was confident it would the job, which it certainly does