For years I put up with the boominess of my excellent Whisperroom 4260 isolation booth. I had Auralex pyramids and wedges inside but still needed to trap bassy vocal frequencies that were bouncing around. Installing 4 Auralex Lenrd Bass Traps was like flipping a switch. My mic no longer sounds like I need to EQ it. My Shure KSM-32 and Grace 101 have a new, brilliant clarity.