I have bought an Ampeg SVT3-Pro head and an Ampeg BXT210M cabinet 1 week ago. This is my first time using a head-cabinet rig. I realized that there is a light appears in the cabinet when i slap in high volumes (especially when i pull the D and G strings). This light is visible from the front-ports. I guess it's all about the resistors light in the titanium tweeter because the light is more bright in that part of the cabinet. Does anyone knows what it is?