About 20 years ago I bought the Behringer measurement mic and the thing that let you compare the signal to what the mic heard. I made 27 Risch style bass traps and had it all in the basement of my first house. Traps definitely do make a measurable difference but you need a ton of them. I'd say it's practically impossible to fix the bad resonances any basement will have. You can EQ them out, which I did to +-1db. It sounded weird, though. I eventually gave up on heavy EQ. The best thing for bass is to live in a house that is light construction. Plain wood frame, drywall. You still have resonances but a lot of the energy escapes through the walls. Then add some traps and light EQ if you want to. Placement is very important.
so bass traps in corners do nothing, it seems we have been fooled. or are being fooled.
Well I've watched a few of their videos and mostly they seem to be no nonsense. what do you think?
Corner Bass Trap Nonsense - www.AcousticFields.com (youtube.com)