How is Roxul better than foam absorption material for bass traps?

On May 24, 2012

Q: How is Roxul better than foam absorption material for bass traps?

A: For bass trapping, Roxul soundproofing insulation does a great job from the deep bass and up, while foam wedges seem to do very little to nothing until you reach 250hz. Foam wedge bass traps had virtually no effect on the decay time below 200 hz while Roxul soundproofing insulation decreases the 65 hz decay time and up by a significant amount, with some effect at even 45hz.
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