I bought a crapload of acoustic foam only to realize that evrything in my room has a strage bassy flavour to it. Every sound in my room has a C4 (in fl studio naming) note verbish type tail at the back.
It doesn't "reverbate" as before the room preparation, but it still doesn't sound good. It just sounds weird. Also, it seems my vocals have more of the effect as I speak louder and the mic leel also affects the C4-ation level.