are ceiling tiles all the same?

I put in a drop ceiling with ceiling tiles into my new control room. its about 4 inches below the ceiling drywall. My Idea was to fill the void with insulation to act as a bass trap. I saw 2 different types of panels: they are 2 by 4 feet, and there are made of a material kind of like donna conna, or a paperish type material. I noticed another type of ceiling tile that has a 5/8 piece of rigid fiberglass with a coating on one side. Are ceiling tiles all the same when it comes to sound absorbtion? Can someone recommend which one i should use.

Most standard ceiling tiles (such as Armstrong here in the states) are designed for office buildings, etc., and to be effective mostly at speech frequencies. They are usually white, with a hardened, textured surface. In my experience, these tiles are too reflective at high frequencies to be useful for studios. In general, I prefer absorptive ceilings, so you'd be better off using cloth-covered rigid fiberglass or rockwool panels dropped in your ceiling grid. For more on using ceiling tiles in a studio ceiling, see: http://www.realtraps.com/p_ceiling.htm

jwl wrote:

In my experience, these tiles are too reflective at high frequencies to be useful for studios.

I would agree that there are alot of tiles out there that manufacturerers claim to be acoustic tiles, but are not absorptive enough ... However there are some tiles which are very profficient for studio applications with regard to absorption of higher frequencies ... OWA Futura60 Ceiling Tile.... I think the absorption curve says it all I am thinking control room here, and not live room....