Vicoustic VICB00144 4-Super Bass 90s (Pack of 4)These Bass Traps, sold in sets of four units per package, are considered to be one of the best optimized solutions when treating low frequencies. They are also an excellent complement to other acoustic products. The unique shape of all the Bass Trap options allows you to minimize the dramatic effects that result from resonating waves, commonly associated with the "boomy" sound often heard in untreated rooms. Super Bass 90 combines several techniques