Yamaha Rxv 663 setting question

[dtowntke]

so i bought a new sub and hooked it up to my yamaha and i noticed no music was coming from the sub so i went into the settings. there's a setting to set the bass to fronts sub or both. the setting i had it on was sub but no music was coming out so i switched it to both and sure enough the sub started pounding. the sub works when i have it set to sub with movies just no music. i am streaming my music from my computer to my ps3 if that matters. so is this normal or should i be getting some thump from my sub when its set to sub only when listening to music.