IMO this is up to GM to say the final word. I had hard time learning this during PbP two years ago...
Darkened floor in the building, targets somewhere around. My adept had Select sound filter set to
human steps, doors, metal parts scratching(weapons etc), and breathing. We knew there is another one in corridors, well we didnt see each other, Ive managed to hear his steps and used Spatial recognizer to be able to locate the man and outmaneuver the man into the field of fire. He solved that with grenade launcher, catching me in chunky salsa area, costed me point of Edge for Hand of god and new liver

well I never forget those combat turns

IMO when you use select sound filter the way you just did...to supress the background noise, you would supress even some important sounds that would be good to hear. It works the way it analyzes this background, and when specific pattern appears, it highliths it over others...