| Interesting
Marc, nice diagram. I see how the dip frequency would change, my apologies for not thinking it through earlier. You could certainly take a look at either your ETC or Impulse response and you should be able to easily see the floor reflection. However, since you already see it with your eyes, and have measured it physically, there is hardly much point. Unless you can't believe your eyes and need further graphical confirmation. ;-)
So, what will you do about it? Who does any of us about it? We all have floors.
An absorber would need to be quite deep to have any significant effect at 110Hz.
Here's how I would deal with it.
Search for Wall_Bounce_Calculator_2D.xls
This may help you find a complementary boost at 110Hz by changes of speaker position. Remember height is just as important as the other dimension. This is a 2D device, but you can run the numbers a second time using height as one of the two D's.
There is an even more direct, more certain route.
Measure the frequency response from one speaker at a time. Vary the speakers position, find the least damaging spot. Don't forget height. Measure using the other speaker, tweak for optimum, average the results. Check using some averages with some of the earlier different positions to confirm that you have the best combined spot. Double check by driving both speakers, and try a few combined moves, e.g. both closer to the front wall.
This is all done very easily and quickly. It provides a certain path to the best compromise. Unless you are prepared to work on a giant sponge!
Best Regards, DD
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