so bass traps in corners do nothing, it seems we have been fooled. or are being fooled.

I spent 4+ years personally building my own dedicated listening room. The room is 13.5’ x 15.5’ x 9’. (I consider this a small room.) The room was originally our separate dining room. I closed it off and stripped down to studs on front and rear wall. All walls and ceiling are acoustically treated. Based on Dennis Foley’s acoustic product design principles, I spent 100s of hours designing and building my own absorption panels/ boxes and diffusers of various types, sizes and weight. It took numerous trials and errors to determine the best way to design and implement acoustic treatment within my room. I watched all of Dennis Foley’s videos as well as read/ watched as many other acoustic treatment related online videos, articles, books and photos, as I possibly could. I’ve learned a lot about room acoustic treatment and design. I’m just a typical audiophile who wants the best sound possible from my room. I agree (somewhat) with Dennis that corner bass traps are not always required. Depending on your specific room size/ shape, speaker placement..etc, sound pressure build-up can be more pronounced in other areas besides the corners. Address those areas first. If the corners end up being the biggest issue, then corner bass traps are likely needed. More often than not, corner bass traps alone don’t entirely fix low frequency issues. I don’t have corner bass traps. My room has a 5/6db variance between 30hz to 14khz - in a small room. I’m very happy. Dennis means well. Whether or not you agree with him, he’s working hard to bring better sound to this hobby that we all care so much about.

I would do some research on Dennis Foley on other audio forums before doing business with him.

I think the point is when all is said and done it takes a lot more than 2-4 corner bass traps to control the bass in a room. Residential and commercial spend a fortune to control bass but I can hear Godzilla stomping through Tokyo while I’m in the next theater watching The Notebook. 😆 Just kidding but not about the bass transfer. It’s like spending $5k on tires to save 1/10th of a mile per gallon. Does it help if done right? Yes, just not enough to justify the cost. New Record Day did some cool bass treatments in his new space that did make a difference but as you can see it takes up a lot of space and it’s not just in the corner. The funny thing is a lot of people treat the corners for the bass before the handle so many other things like first reflection points. 

...bass traps make nice 'dust bunny' habitats....;)

Bass trap works if you know where to put them.i used to own Martin Logan request. And I saw Gale Sander and Bruce Brissom if Iam right? They put the bass trap near the side of both the SL3 Martin Logan . Yes indeed I works. When I applied my DIY bass traps.To do tweaks you have to have an open mind, listening to other people experience is not as good as doing it yourself.