A resonance bump in a room's frequency response is called a room node. Bass traps substantial enough to control nodes have always been expensive to buy or intricate and time-consuming to build - not anymore.
The LENRD Bass Trap (Low-End Node Reduction Device) is extremely effective at smoothing out low frequency room nodes. Great for use in any room but are most effective in rooms smaller than approximately sixteen by sixteen feet.
Superior broadband absorption, especially at low frequencies
Easiest and most cost-effective way to control excess low frequencies without giving up large amounts of cubic space
Fit room corners and wall/ceiling junctures perfectly
Class B flame retardancy
Will not crumble with age