Try GIK Monster Bass Traps. They are not expensive and VERY effective. I agree that sometimes a room is just too boomy on its own. Moving speakers and listening chair can locate a specific spot where the standing waves cancel just right, but that only helps if you sit EXACTLY in the sweet spot. Talking and walking in the room still reminds you that it is the acoustics of the room that need to be improved. ASC Tube Traps have been considered the best for many years. They are expensive, and the ones for bass are large diameter, tall and require floor space. Recently I discovered (and now prefer) "Monster Bass Traps" made by GIK Acoustics. These (and the less expensive Model 244) were designed for studios, they hang on the wall, and they truly absorb the reflections between 80 and 500 Hz better than anything else have experienced.
For a boomy room, what panels will reduce mid-bass
My listening room must have standing waves, because at my listening position there is too much mid-bass. It sounds bloated and the bass is just too pronounced. What acoustic devices are VERY good at reducing this boomy bass in the room? Panels on the wall would be nice, but I need something very effective.