I know it's far from ideal, but I have a few excess cartons of ceiling tiles. If I stick some to my walls, will it help to noticeably reduce my room's echo or reverberation? Or will the difference be so minimal, that I will be wasting my time?
Any plain wall is a sound board. Any application of materials that are porous, or have 33 degree multiple angles will reduce the amount that sound waves bounce. The acoustic tiles will provide a reduction in the echo. And will in turn provide a better sound insulating factor. By themselves they will not provide the recording studio atmosphere. You will need a entirely different set of materials and structural application.