I have a Marantz SR7010 and my main speakers are Amphion Argons 3S. Centre is MA Radius 225 and 45 rears. I recently added some Dali C-1 Atmos speakers and recently after that I was watching Ready Player One and during bass scenes my speakers now go 'whup' and it's like they are reaching full excursion, cones move massively. This happens at most volumes down to -45db on the amp. Now it happens any time there is low frequency. But, if I listen in stereo it doesn't happen. I tried running frequency samples from 2hz upwards and nothing. There is a small crackle sometimes as the frequency changes.. What is it? I presumed my speakers blew, but they are fine for music. I'm thinking my amp can't cope, but it's still a decent av amp. If I added a sub the issue would probably dissapear, but the speakers are only 6 months old, and this happened at a low level so maybe they are warranty?