I'm trying to kill the annoying "hiss" present in my TV captures of Waterworld, and I lose most of it when I trim the audible range down to 40Hz to 5,100Hz. Am I losing a lot of the movie's sound as well? I admit I don't know a lot about EQ and I'm simply cutting in from -Infinity dB at 39Hz to 0 dB at 40Hz. I'm using the Audio EQ effect in Sony Vegas.