I use subs for live bands & when you have to use the stage as a platform, the last thing, you want is the sub coupled with the stage vibrating into mics. Without decoupling the sound is muddy with numerous other feedback & resonant problems. When your running at 127 to 130 spl they make a difference. Perhaps for home use they are not as effective. For this reason i prefer to fly the subs when i can. They do not change the sound, they decouple and you hear what is actually coming from the sub,without the floor resonance being added to the mix. Maybe i play too loud, or maybe some people like the walls & floor in the mix?