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Spent $150 on a bass trap kit and my mixes still sound like they're in a cardboard box

I dropped $150 on one of those foam corner bass trap kits off Amazon and honestly it barely touched the low-end rumble in my 10x12 shed studio. Any of you tried those DIY rockwool panels instead, and did they actually fix your room issues?
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robert_bennett29
Did you put those foam panels directly in the corners, or did you try spacing them out a bit? I spent months fighting low end in my own room before switching to rockwool, and it made a real difference. The foam just doesn't have enough mass to absorb the deep frequencies, it's like trying to stop a tidal wave with a paper towel. I built four 2x4 foot panels using Roxul Safe'n'Sound and some wood frames, and the bass finally tightened up. It took a weekend of work and cost around the same as your kit, but the result was night and day. I still use some thinner foam for early reflections, but for the low end you really need something dense.
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alicebarnes
Like trying to stop a tidal wave with a paper towel" - that's the most accurate thing I've read all week, @robert_bennett29. I actually tried spacing those foam panels out a couple inches from the corners and it barely did anything. You're telling me you built four 2x4 foot rockwool panels for the same money? I spent $150 on that foam kit and can't even feel a difference in the room, so I'm definitely switching to rockwool.
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