Originally Posted by triple18
I have a Logic CP620 amp on a MTX Blue Thunder 12. I have been tweaking the settings a number of different ways because there are times when the bass really hits i hear a noise like someone is thumping the cone. i know that this is probably an over excursion of the cone. any ideas on eliminating this?
that is probably the sub bottoming out. Basicly the coil is hitting the backplate of the sub. Which is not good at all. You need to adjust your settings so that doesn't happen.
If its not that then it is likely the amp clipping, which is really bad also.