av amp可否用濾波？？

Dear all expert,

I have buy a 清華濾波 last week, after use it my LCD TV is more sharp, CD background is a bit more clear.

The sales person teach me plug the AMP into 清華濾波's by pass 濾波 slot, but I still fill my AMP is 細聲咗, 以前開 48-50度, 現在要開 50-54度先夠.
請問這是正常嗎????

Thanks!