That's odd they are shielded speakers, possible problem with the shielding inside the speaker? Maybe add a spacer of some sort or make shift stand between the M3 and the TV. It should just need a few inches, a 2X8 comes to mind for you temporary setup.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70