Isover Akustic EP1 as an alternative to OC 705

Hi everybody, In order to install some low-frequency absorption in my home studio (absorption panels or superchunks), I was looking for a similar product as Owens-Corning 705-FRK here in Germany. I talked to a consultant from Isover and he advised me to use Isover Akustic EP1 which has 70-80 kg/m^3. It is available as panels in thicknesses up to 4cm. To my knowledge OC 705-FRK has about 90 kg/m^3, therefore, I guess, the Isover stuff should perform almost as well at low frequencies as 705-FRK. Does anybody have experiences with this product? Unfortunately there are no specs available on the Isover website. Waldemar

you're really looking for something in the 48kg/m3 range and consider using 100mm (or 50mm) as a "face" and lighter insulation behind to fill in the corner - 15kg/m3.

My main concern are the low frequencies. I thought the more dense the fiberglass, the more absorption it supplies at low frequencies. Therefore, heavy material should be preferable for my purpose, shouldn't it? Waldemar

at a certain point, the dense material depth impacts the flow which is less desirable.