Alright people. Ive just been given a active subwoofer (wharfedale sw150) it sounds good but not great its humming a bit when talking voices (not on vocals) never had a sub but al take a free-bee any day. Do you think this crossover need's adjusting on the back its 35% to 85% im on 75? My its running of is a onkyo a9050 🙂