4 Inch Studio foam® Wedges™ are recommended for rooms with pronounced low frequency problems or where sonic accuracy is mandatory and maximum acoustic absorption is required (e.g. voiceover or drum booths, forensic audio labs and mastering rooms). 4 inch Studiofoam® Wedges™ provide 3 times the low-end control of 2 inch, and can effectively tame even the worst sonic anomalies. In some instances, using 4 inch acoustical Studiofoam® can lessen the need for significant, dedicated bass trapping.