I've been looking for insulation to tame some of the low-mids in the vocal booth, and this is
the ticket from Roxul.
Best part is the name - CavityRock.
"Clear and detailed down to lows that will make your cavity rock!"
This is a little denser than the 703 at 4.5 lbs/cubic ft. I just wanted to share this for anyone looking for deeper bass trapping. Available in Canada, eh!