Originally Posted by kasmira
Say if you have a 55hz resonance or null in your listening position, you can use a tone generator / sine wave generator to play a signal at 55hz. You can use an SPL meter to find the loudest position in the room at that frequency (or you can just use your ears). Adding an absorber at this position will help to eliminate the problem.
You should actually place Varitunes similarly. Placing panels where they are convenient won't really always work, but large traps like the Varitunes work at a lot of positions in most scenarios anyways (similarly with a lot of large absorbers)
We are not talking about Varitunes here, please don't go there. Let's stay focus on Limp Mass Absorber.
Let's be specific here, I don't understand why you involve 55Hz resonance or null. I said, I have according to my measurement a peak 30Hz, null 50Hz, and peak 80Hz at LP, period.