Hello all. I really need help on this. İ am begginer to all this sport.\nI have a marantz 5013 and a 3.1 setup system.\nMy speakers are Advance acoustic kubic K3S and the K center speaker.\nhttps:\/\/advance-acoustic.com\/en\/archives\/110-k3s\nhttps:\/\/advance-acoustic.com\/en\/hifi-loudspeakers\/center-speaker\/103-k-center\nAnd i bought this subwoofer the Sub 200\nhttps:\/\/advance-acoustic.com\/en\/hifi-loudspeakers\/active-subwoofer\/49-sub-200\nwhich it was demo\/used from a sound\/audio shop.\nThe sub plays very weak amd it doesnt give pintch at all. The master volume is set very low at 35% because it was booming and destroy tne sound. I run audyssey multEQ with the app. I set crossovers at 80 and changed from -5 to -2 to add power. İ didnt change the curve because i dont know how.\nSo the question is 1) is it faulty? There are 2 subs 1 active 1 passive radiator.\nQuestion 2) does it play right? does it go low at 30hz? And why its not punchy.