Are floating walls and ceilings THAT important?

I am beginning a dedicated room design that will be in the basement of a new construction house. I plan on optimizing, as much as possible, room dimensions. Wanting fellow audiogoners to share some knowlege and experience. Also planning on several dedicated circuits hopefully cryoed. I also assume a subfloor over the concrete would be very desirable. I was not going to float the walls and ceilings thinking it may be overkill but my wife was painting (rolling) the room behind my listening (living) room and man there was a resonant frequency that I thought was bass from my listening source. I am leaning toward floating the walls now if I can get my contractor to get on board and understand this construction method? I kind of understand but am not that handy? Is the extra cost worth the benefit, in your experiences? My entire system retails for about $14000 and I listen to music and watch movies about equally. Thanks much. Twc Did you catch that my wife was in there working and I was listening? Actually just breaking.