Issues with my subwoofer

[Noel198]

Well, i think my subwoofer is not the real problem, I just upgrade my Sony STR DH500 to a Pioneer VSX-33

This happens only when i go to DVD mode

I test my DVD player, sound come out from all of my speakers but my subwoofer is mute wich usually always turn on automatically because is in AUTO function, i try turn on subwoofer manually, when i do lights turn GREEN but subwoofer still dead no sound come out from it
When i change to blu-ray mode subwoofer turn on as normally do AUTOMATICALLY and works as always do , but when i try DVD mode again subwoofer is dead...whats happening?, please help