They look good. As expected, they do little in the low mid and nothing to the bass area, but that is normal, and it shows on the graph I asked from the Thomann seller. Probably a 10 or yet better 20 cm thick rockwool (50 kg/m3) is better if you have the space for it. I have the space for it, but wanted to have many different absorber panels, to have more even broadband absorption, and used them to build mobile panels.
i love this absorbers, easy to cut and simple to glue, no words what can i say, if you need it you have to buy it, it is nice and thick, and will cover a lot of frequency range... i use it for my vocal room
* Ceny zawierają podatek VAT. Do ceny artykułu(ów) należy doliczyć koszty wysyłki. Oferty ważne do wyczerpania zapasów. Za błędy w opisie i innego rodzaju pomyłki nie ponosimy odpowiedzialności. CK=Cena katalogowa produktu