Ok so I was playing IM2 and in the opening scene I heard a fluttering coming from my M80's I was worried but after watching more I noticed it was fireworks going off (or I thought) so I didn't turn it down. But the next explosion I heard it again but louder I Listen to all my blurays at 0 and have never heard this before. I turned the volume down to -10 and still heard it fluttering. I ended up watching the rest at -20 and the fluttering stopped. I just added a vp 180 to my set up and the sound is definetly not coming from that it's the m80's. I have a 2809 denon and a emotiva xpa5, it's just a 3.0 setup. Have the speakers blown? Or is that movie just bass heavy? Would a sub fix this issue? Thanks

Denon 2809, Emotiva XPA5, M80's, VP180, EP500