Hey guys bought a 2105 that was completely recapped by an authorized factory tech, I am have some intermittent connection issues I am chasing down. My question though is it normal to see my speakers drivers pulsate when unit is powered on? I have heard a low thump a couple times as well, amp on last amp off first and have heard nothing when powering off. I have been in contact with the owner of the shop and he assures me that his tech said this is normal on this amp, he has been very cool about my issues and wants to work it out if we can. I still have time for a refund if don't get issues solved, the amp sounds great when I am not having the occasional connection problem. I would appreciate any advice you guys have to offer thanks in advance.